Showing posts with label Plants. Show all posts
Showing posts with label Plants. Show all posts

Thursday, July 7, 2016

Aquaponics Basement System Organic/ Food 10 Tips Update Part 2




Urban agriculture is the practice of cultivating, processing, and distributing food in or around a village, town, or city.[1] Urban agriculture can also involve animal husbandry, aquaculture, agroforestry, and horticulture. These activities also occur in peri-urban areas as well.[2] 

Urban farming is generally practiced for income-earning or food-producing activities, though in some communities the main impetus is recreation and relaxation.[3]

Urban agriculture contributes to food security and food safety in two ways: first, it increases the amount of food available to people living in cities, and second, it allows fresh vegetables, fruits, and meat products to be made available to urban consumers. It decreases food deserts.

A common and efficient form of urban agriculture is the biointensive method. Because urban agriculture promotes energy-saving local food production, urban and peri-urban agriculture are generally seen as sustainable agriculture. Another aspect of urban farming, especially in densely populated American cities, is the use of grow-bags to raise a wide range of crops.

 Many apartment dwellers with no yards to speak of, or people with very small yards, will set up these bags on a balcony or thin strip of land. Also, many types of hanging bags are available to plant, expanding the area available for planting.

The bags themselves are made from a variety of materials, including canvas, weed barrier fabric, and polyester, all having semi-porus properties so the soil can drain adequately. The term "Bagriculture" was coined in 1998 by Los Angeles animator and amateur archaeologist Rudy Zappa Martinez to describe this type of agriculture.

The recognition of environmental degradation within cities through the relocation of resources to serve urban populations[4] has inspired the implementation of different schemes of urban agriculture across the developed and developing world. From historic models such as Machu Picchu to designs for new productive city farms, the idea of locating agriculture in or around the city takes on many characteristics.






An urban farm in Chicago


A small urban farm in Amsterdam

History

 


Huerto (vegetable garden or orchard) Romita) organization dedicated to urban agriculture located in the La Romita section of Colonia Roma, Mexico City.
Community wastes were used in ancient Egypt to feed urban farming.[5] In Machu Picchu water was conserved and reused as part of the stepped architecture of the city, and vegetable beds were designed to gather sun in order to prolong the growing season.[5]

Allotment gardens came up in Germany in the early 19th century as a response to poverty and food insecurity.[6] Victory gardens sprouted during WWI and WWII and were fruit, vegetable, and herb gardens in US, Canada, and UK.

 This effort was undertaken by citizens to reduce pressure on food production that was to support the war effort. Community gardening in most communities are open to the public and provide space for citizens to cultivate plants for food or recreation. A community gardening program that is well-established is Seattle's P-Patch.

The grass roots permaculture movement has been hugely influential in the renaissance of urban agriculture throughout the world.

The idea of supplemental food production beyond rural farming operations and distant imports is not new and has been used during war times and the Great Depression when food shortage issues arose. As early as 1893, citizens of a depression-struck Detroit were asked to use any vacant lots to grow vegetables.

They were nicknamed Pingree's Potato Patches after the mayor, Hazen S. Pingree, who came up with the idea. He intended for these gardens to produce income, food supply, and even boost self independence during times of hardship. During the first World War president Woodrow Wilson called upon all American citizens to utilize any available open space for food growth, seeing this as a way to pull them out of a potentially damaging situation.

Because most of Europe was consumed with war, they were unable to produce sufficient food supplies to be shipped to the U.S., and a new plan was implemented with the intent to feed the U.S. and even supply a surplus to other countries in need. By the year 1919 over 5 million plots were growing food and over 500 million pounds of produce was harvested.

A very similar practice came into use during the Great Depression that provided a purpose, a job, and food to those who would otherwise be without anything during such harsh times. In this case these efforts helped to raise spirits socially as well as to boost economical growth.

Over 2.8 million dollars worth of food was produced from the subsistence gardens during the Depression. By the time of the Second World War the War/Food Administration set up a National Victory Garden Program that set out to systematically establish functioning agriculture within cities.

With this new plan in action, as many as 5.5 million Americans took part in the victory garden movement and over 9 million pounds of fruit and vegetables were grown a year, accounting for 44% of U.S.-grown produce throughout that time. With its past success in mind and with modern technology, urban agriculture today can be something to help both developed and developing nations.

Facts

  • 50% of the world's population lives in cities.[7]
  • 800 million people are involved in urban agriculture world-wide and contribute to feeding urban residents.[8]
  • Low income urban dwellers spend between 40% and 60% of their income on food each year.[9]
  • By 2015 about 26 cities in the world are expected to have a population of 10 million or more. To feed a city of this size at least 6,000 tonnes (6,600 tons) of food must be imported each day.[10]
  • 250 million hungry people in the world live in cities[11]

A tidy front yard flower and vegetable garden in Aretxabaleta, the Basque Country

Resource and economic

The Food and Agriculture Organization of the United Nations (FAO), has defined urban agriculture as:[12]
[A]n industry that produces, processes and markets food and fuel, largely in response to the daily demand of consumers within a town, city, or metropolis, on land and water dispersed throughout the urban and peri-urban area, applying intensive production methods, using and reusing natural resources and urban wastes to yield a diversity of crops and livestock.
The definition of urban agriculture as an industry that responds to the nutritional demands of a city, from within that city, with the use and reuse of that city's resources while acknowledging economic and resource use does not reconcile aspects of regional health, food security, and application of grassroots organizations.
(This definition is based on the work of Luc Mougeot of the International Development Research Centre and used in technical and training publications by UN-HABITAT's Urban Management Programme, FAO's Special Programme for Food Security, and international agricultural research centres, such as CIRAD.)



A vegetable garden in the square in front of the train station in Ezhou, China

Environmental

The Council on Agriculture, Science and Technology, (CAST) is an international consortium of scientific and professional societies based in Ames Iowa that compiles and communicates credible science-based information to policy makers, media, private sector, and the public. CAST defines urban agriculture to include aspects of environmental health, remediation, and recreation:[13]
Urban agriculture is a complex system encompassing a spectrum of interests, from a traditional core of activities associated with the production, processing, marketing, distribution, and consumption, to a multiplicity of other benefits and services that are less widely acknowledged and documented. These include recreation and leisure; economic vitality and business entrepreneurship, individual health and well-being; community health and well being; landscape beautification; and environmental restoration and remediation.
Modern planning and design initiatives are more responsive to this model of urban agriculture because it fits within the current scope of sustainable design. The definition allows for a multitude of interpretations across cultures and time. Frequently it is tied to policy decisions to build sustainable cities.[14]

Food security

Access to nutritious food is another perspective in the effort to locate food and livestock production in cities. With the tremendous influx of world population to urban areas, the need for fresh and safe food is increased. The Community Food Security Coalition (CFSC) defines food security as:[15]
All persons in a community having access to culturally acceptable, nutritionally adequate food through local, non-emergency sources at all times.

Source: Wikipedia


TTFN
CYA Later Taters
Thanks for watching.
Donnie/ Sinbad the Sailor Man  

Aquaponics Basement System Organic/ Food Grade Overview 101 Part 1 of 2




Aquaponics /ˈækwəˈpɒnɨks/ or pisciponics is a sustainable food production system that combines a traditional aquaculture (raising aquatic animals such as snails, fish, crayfish or prawns in tanks) with hydroponics (cultivating plants in water) in a symbiotic environment.

In aquaculture, effluents accumulate in the water, increasing toxicity for the fish. This water is led to a hydroponic system where the by-products from the aquaculture are broken down by nitrogen fixing bacteria, then filtered out by the plants as vital nutrients, after which the cleansed water is recirculated back to the animals.

As existing hydroponic and aquaculture farming techniques form the basis for all aquaponics systems, the size, complexity, and types of foods grown in an aquaponics system can vary as much as any system found in either distinct farming discipline.[1]

History

 

Aquaponics has ancient roots, although there is some debate on its first occurrence:
  • Aztec cultivated agricultural islands known as chinampas and are considered by some as the first form of aquaponics for agricultural use[2][3] where plants were raised on stationary (and sometime movable) islands in lake shallows and waste materials dredged from the Chinampa canals and surrounding cities are used to manually irrigate the plants.[4][5]
  • South China and Thailand who cultivated and farmed rice in paddy fields in combination with fish are cited as examples of early aquaponics. These polycultural farming systems existed in many Far Eastern countries and raised fish such as the oriental loach (泥鳅, ドジョウ),[6] swamp eel (黄鳝, 田鰻), Common (鯉魚, コイ) and crucian carp (鯽魚)[7] as well as pond snails (田螺) in the paddies.[8][9]



Diagram of the University of the Virgin Islands commercial aquaponics system designed to yield 5 metric tons of Tilapia per year.[10]
The development of modern aquaponics is often attributed to the various works of the New Alchemy Institute and the works of Dr. Mark McMurtry et al. at the North Carolina State University.[1]

Inspired by the successes of the New Alchemy Institute, and the reciprocating aquaponics techniques developed by Dr. Mark McMurtry et al., other institutes soon followed suit.

Starting in 1997, Dr. James Rakocy and his colleagues at the University of the Virgin Islands researched and developed the use of Deep Water Culture hydroponic grow beds in a large scale aquaponics system.[10]

The first aquaponics research in Canada was a small system added onto existing aquaculture research at a research station in Lethbridge, Alberta.

Canada saw a rise in aquaponics setups throughout the ’90s, predominantly as commercial installations raising high value crops such as trout and lettuce.

 A setup based on the deep water system developed at the University of Virgin Islands was built in a greenhouse at Brooks, Alberta where Dr. Nick Savidov and colleagues researched aquaponics from a background of plant science.

The team made findings on rapid root growth in aquaponics systems, on closing the solid waste loop, and that because of certain advantages in the system over traditional aquaculture, the system can run well at a low pH level, which is favoured by plants but not fish.

The Edmonton Aquaponics Society in Northern Alberta is adapting Dr. Savidov's commercially sized system to a smaller scale prototype that can be operated by families, small groups, or restaurants. They intend to further develop the closed solid waste loop.[11]


Vegetable production part of the low-cost Backyard Aquaponics System developed at Bangladesh Agricultural University
The Caribbean island of Barbados created an initiative to start aquaponics systems at home, with revenue generated by selling produce to tourists in an effort to reduce growing dependence on imported food.[12][13][14]

In Bangladesh, the world's most densely populated country, most farmers use agrochemicals to enhance food production and storage life though the country lacks oversight on safe levels of chemicals in foods for human consumption.[15]

To combat this issue a team led by Professor Dr. M.A. Salam at the Department of Aquaculture of Bangladesh Agricultural University, Mymensingh has created plans for a low cost aquaponics system to provide chemical free produce and fish for people living in adverse climatic conditions such as salinity-prone southern part and flood-prone haor area in the eastern region.[16][17]

Recent years have seen a shift towards community integration of aquaponics, such as the nonprofit foundation Growing Power that offers Milwaukee youth job opportunities and training while growing food for their community.

The model has spawned several satellite projects in other cities, such as New Orleans where the Vietnamese fisherman community has suffered from the Deepwater Horizon oil spill, and in the South Bronx in New York City.[18]

In addition, aquaponic gardeners from all around the world have gathered in online community sites and forums to openly share their experiences and promote the development of this form of gardening.[19]

Source: Wikipedia.org

More to come on This and Hopefully I will have some of my own videos to show on my attempt at building a working open air Aquaponics system this year.
Somebody Come and Play Today! Earn as You Learn, Grow as You Go!

The Man Inside the Man
from
Sinbad the Sailor Man
A
JMK's Production


Share this page




TTFN
CYA Later Taters!
Thanks for stopping by.

Donnie/Sinbad the Sailor Man

P.S. Sweet Sixteen My Breakout Year's Hottest and Fastest Growing Biz Op? Do You Want In? If You Do! Click Here and Sign Up!

Tuesday, February 18, 2014

Automated Bell Siphon~ "For Flood and Drain Grow Beds"



 

Published on Dec 25, 2012
 
Website: http://www.facebook.com/OSPESustainab...
Global site: http://www.facebook.com/OpenSourcePro...

This is Sustainable Food's method for building an aquaponics Automated Bell Siphon and describes what it is, how it works, and how to build one,

Please Like & Share the website and global collaborative site, and hopefully more people will join so we can all work together to make the best system for food abundance as possible! 

This is a fully open-source project, so I advocate anyone and everyone taking these designs for personal use, sharing with other people, and, even help to improve the system so we're all always using the most up-to-date, efficient, and optimal design for growing any size Sustainable Food aquaponics system.




Somebody Come and Play Today! Earn as You Learn, Grow as You Go!

The Man Inside the Man
from
Sinbad the Sailor Man
A
JMK's Production


Share this page





TTFN
CYA Later Taters!
Thanks for stopping by.

Donnie/Sinbad the Sailor Man

P.S. Sweet Sixteen My Breakout Year's Hottest and Fastest Growing Biz Op? Do You Want In? If You Do! Click Here and Sign Up!
 
 

DIY Venturi~ " A Few Easy Builds for Aquaponics, Aquaculture, or Hydroponics"


Published on Nov 1, 2013

I really like the idea of aerating the fish tank by venturi to save some coin & help make the system quieter.. A mate shared an idea with me for a unit he had been working on & was happy with...

I decided to have a crack at his idea along with a few others to see which I thought would work the best for our set up...

I was most pleased with the results & ended up going with the "Bear Unit".. I have had one in the aquaponic fish tank for over 2 weeks now with no issues & have plans to add another to a moving bed bio filter that will be added to the system soon...

Was also very pleased with the off the shelf unit purchased from Earthan group.. That one will be going into the moving bed bio filter in the recirculating aquaculture system..

Below are a couple of pages I found helpful when looking into venturis,

http://www.youtube.com/watch?v=Wokswr...
http://en.wikipedia.org/wiki/Venturi_...
http://leisure.prior-it.co.uk/venturi...

Below is an explanation of "Fine bubble aeration" along with some useful links/references,
http://en.wikipedia.org/wiki/Water_ae...

Hope this is of help to some out there...
For more regular updates from the chooks, worms, aquaponic & wicking gardens come visit us at http://www.facebook.com/Bitsouttheback

Have a great one all...



The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section of pipe. The Venturi effect is named after Giovanni Battista Venturi (1746–1822), an Italian physicist.



The pressure in the first measuring tube (1) is higher than at the second (2), and the fluid speed at "1" is lower than at "2", because the cross-sectional area at "1" is greater than at "2".

Background

The Venturi effect is a jet effect; as with a funnel the velocity of the fluid increases as the cross sectional area decreases, with the static pressure correspondingly decreasing. 

According to the laws governing fluid dynamics, a fluid's velocity must increase as it passes through a constriction to satisfy the principle of continuity, while its pressure must decrease to satisfy the principle of conservation of mechanical energy

Thus any gain in kinetic energy a fluid may accrue due to its increased velocity through a constriction is negated by a drop in pressure.

When a fluid such as water flows through a tube that narrows to a smaller diameter, the partial restriction causes a higher pressure at the inlet than that at the narrow end. 

This pressure difference causes the fluid to accelerate toward the low pressure narrow section, in which it thus maintains a higher speed. 

The Venturi meter uses the direct relationship between pressure difference and fluid speeds to determine the volumetric flow rate.



A flow of air through a venturi meter, showing the columns connected in a U-shape (a manometer) and partially filled with water. The meter is "read" as a differential pressure head in cm or inches of water.

Relationship between pressure and flow speed

An equation for the drop in pressure due to the Venturi effect may be derived from a combination of Bernoulli's principle and the continuity equation.

Referring to the diagram to the right, using Bernoulli's equation in the special case of incompressible flows (such as the flow of water or other liquid, or low speed flow of gas), the theoretical pressure drop at the constriction is given by:
p_1 - p_2 = \frac{\rho}{2}\left(v_2^2 - v_1^2\right)
where \scriptstyle \rho\, is the density of the fluid, \scriptstyle v_1 is the (slower) fluid velocity where the pipe is wider, \scriptstyle v_2 is the (faster) fluid velocity where the pipe is narrower (as seen in the figure). This assumes the flowing fluid (or other substance) is not significantly compressible - even though pressure varies, the density is assumed to remain approximately constant.

Choked flow

The limiting case of the Venturi effect is when a fluid reaches the state of choked flow, where the fluid velocity approaches the local speed of sound. 

 In choked flow the mass flow rate will not increase with a further decrease in the downstream pressure environment. 

However, mass flow rate for a compressible fluid can increase with increased upstream pressure, which will increase the density of the fluid through the constriction (though the velocity will remain constant). 

This is the principle of operation of a de Laval nozzle. Increasing source temperature will also increase the local sonic velocity, thus allowing for increased mass flow rate.



Flow in a Venturi tube

 

 

Source: Wikipedia.org


Somebody Come and Play Today! Earn as You Learn, Grow as You Go!

The Man Inside the Man
from
Sinbad the Sailor Man
A
JMK's Production


Share this page





TTFN
CYA Later Taters!
Thanks for stopping by.

Donnie/Sinbad the Sailor Man

P.S. Sweet Sixteen My Breakout Year's Hottest and Fastest Growing Biz Op? Do You Want In? If You Do! Click Here and Sign Up!

Mikes Aquaponics - Introduction to Aquaponics and Mikes First System - P...





 
Published on Sept 5, 2012

Join Mike to view his first aquaponics system.

Follow Mike as he grows with his system and learns the ups and downs of aquaponics.

Mike will be providing regular updates so you can see how his system is doing in the heat of sunny Florida.


Aquaponics /ˈækwəˈpɒnɨks/, is a food production system that combines conventional aquaculture, (raising aquatic animals such as snails, fish, crayfish or prawns in tanks), with hydroponics (cultivating plants in water) in a symbiotic environment.

In normal aquaculture, excretions from the animals being raised can accumulate in the water, increasing toxicity.

In an aquaponic system, water from an aquaculture system is fed to a hydroponic system where the by-products are broken down by nitrogen-fixing bacteria into nitrates and nitrites, which are utilized by the plants as nutrients.

The water is then recirculated back to the aquaculture system.

As existing hydroponic and aquaculture farming techniques form the basis for all aquaponics systems, the size, complexity, and types of foods grown in an aquaponics system can vary as much as any system found in either distinct farming discipline.[1]


History

 

Aquaponics has ancient roots, although there is some debate on its first occurrence:
  • Aztec cultivated agricultural islands known as chinampas in a system considered by some to be the first form of aquaponics for agricultural use[2][3] where plants were raised on stationary (and sometime movable) islands in lake shallows and waste materials dredged from the Chinampa canals and surrounding cities were used to manually irrigate the plants.[2][4]
  • South China, Thailand, and Indonesia who cultivated and farmed rice in paddy fields in combination with fish are cited as examples of early aquaponics systems.[5] These polycultural farming systems existed in many Far Eastern countries and raised fish such as the oriental loach (泥鳅, ドジョウ),[6] swamp eel (黄鳝, 田鰻), Common (鯉魚, コイ) and crucian carp (鯽魚) [7] as well as pond snails (田螺) in the paddies.[8][9]
Floating aquaponics systems on polycultural fish ponds were installed in China in more recent years on a large scale growing rice, wheat and canna lily and other crops,[10] with some installations exceeding 2.5 acres (10,000 m2).[11]


The development of modern aquaponics is often attributed to the various works of the New Alchemy Institute and the works of Dr. Mark McMurtry et al. at the North Carolina State University.[13]

 Inspired by the successes of the New Alchemy Institute, and the reciprocating aquaponics techniques developed by Dr. Mark McMurtry et al., other institutes soon followed suit.

Starting in 1997, Dr. James Rakocy and his colleagues at the University of the Virgin Islands researched and developed the use of deep water culture hydroponic grow beds in a large-scale aquaponics system.[12]

The first aquaponics research in Canada was a small system added onto existing aquaculture research at a research station in Lethbridge, Alberta.

Canada saw a rise in aquaponics setups throughout the ’90s, predominantly as commercial installations raising high-value crops such as trout and lettuce.

A setup based on the deep water system developed at the University of Virgin Islands was built in a greenhouse at Brooks, Alberta where Dr. Nick Savidov and colleagues researched aquaponics from a background of plant science.



Diagram of the University of the Virgin Islands commercial aquaponics system designed to yield 5 metric tons of Tilapia per year.[12]

The team made findings on rapid root growth in aquaponics systems and on closing the solid-waste loop, and found that owing to certain advantages in the system over traditional aquaculture, the system can run well at a low pH level, which is favoured by plants but not fish.


The Caribbean island of Barbados created an initiative to start aquaponics systems at home, with revenue generated by selling produce to tourists in an effort to reduce growing dependence on imported food.

In Bangladesh, the world's most densely populated country, most farmers use agrochemicals to enhance food production and storage life, though the country lacks oversight on safe levels of chemicals in foods for human consumption.[14]



Vegetable production part of the low-cost Backyard Aquaponics System developed at Bangladesh Agricultural University

To combat this issue a team led by Professor Dr. M.A. Salam at the Department of Aquaculture of Bangladesh Agricultural University, Mymensingh has created plans for a low-cost aquaponics system to provide chemical-free produce and fish for people living in adverse climatic conditions such as the salinity-prone southern area and the flood-prone haor area in the eastern region.[15][16]

Dr. Salam's work innovates a form of subsistence farming for micro-production goals at the community and personal levels whereas design work by Chowdhury and Graff was aimed exclusively at the commercial level, the latter of the two approaches take advantage of economies of scale.

There has been a shift towards community integration of aquaponics, such as the nonprofit foundation Growing Power that offers Milwaukee youth job opportunities and training while growing food for their community.

The model has spawned several satellite projects in other cities, such as New Orleans where the Vietnamese fisherman community has suffered from the Deepwater Horizon oil spill, and in the South Bronx in New York City.[17]


Whispering Roots is a non-profit organization in Omaha, Nebraska that provides fresh, locally grown, healthy food for socially and economically disadvantaged communities by using aquaponics, hydroponics and urban farming.[18]

In addition, aquaponic gardeners from all around the world have gathered in online community sites and forums to share their experiences and promote the development of this form of gardening[19] as well as creating extensive resources on how to build home systems.

Recently, aquaponics has been moving towards indoor production systems. In cities like Chicago, entrepreneurs are utilizing vertical designs to grow food year round.[20]


Components


Aquaponics consists of two main parts, with the aquaculture part for raising aquatic animals and the hydroponics part for growing plants.[21][22]

Aquatic effluents, resulting from uneaten feed or raising animals like fish, accumulate in water due to the closed-system re-circulation of most aquaculture systems.

The effluent-rich water becomes toxic to the aquatic animal in high concentrations but these effluents are nutrients essential for plant growth.[21]

Although consisting primarily of these two parts, aquaponics systems are usually grouped into several components or subsystems responsible for the effective removal of solid wastes, for adding bases to neutralize acids, or for maintaining water oxygenation.[21]

Typical components include:
  • Rearing tank: the tanks for raising and feeding the fish;
  • Settling basin: a unit for catching uneaten food and detached biofilms, and for settling out fine particulates;
  • Biofilter: a place where the nitrification bacteria can grow and convert ammonia into nitrates, which are usable by the plants;[21]
  • Hydroponics subsystem: the portion of the system where plants are grown by absorbing excess nutrients from the water;
  • Sump: the lowest point in the system where the water flows to and from which it is pumped back to the rearing tanks.
Depending on the sophistication and cost of the aquaponics system, the units for solids removal, biofiltration, and/or the hydroponics subsystem may be combined into one unit or subsystem,[21] which prevents the water from flowing directly from the aquaculture part of the system to the hydroponics part.



A commercial aquaponics system. An electric pump moves effluent rich water from the fish tank through a solids filter to remove particles the plants above cannot absorb. The water then provides nutrients for the plants and is cleansed before returning to the fish tank below where the process repeats.

Plants: hydroponics

Plants are grown as in hydroponics systems, with their roots immersed in the nutrient-rich effluent water.

This enables them to filter out the ammonia that is toxic to the aquatic animals, or its metabolites.

After the water has passed through the hydroponic subsystem, it is cleaned and oxygenated, and can return to the aquaculture vessels.

This cycle is continuous. Common aquaponic applications of hydroponic systems include:

  • Deep-water raft aquaponics: styrofoam rafts floating in a relatively deep aquaculture basin in troughs.
  • Recirculating aquaponics: solid media such as gravel or clay beads, held in a container that is flooded with water from the aquaculture. This type of aquaponics is also known as closed-loop aquaponics.
  • Reciprocating aquaponics: solid media in a container that is alternately flooded and drained utilizing different types of siphon drains. This type of aquaponics is also known as flood-and-drain aquaponics or ebb-and-flow aquaponics.
  • Other systems use towers that are trickle-fed from the top, nutrient film technique channels, horizontal PVC pipes with holes for the pots, plastic barrels cut in half with gravel or rafts in them. Each approach has its own benefits.[23]

 Most green leaf vegetables grow well in the hydroponic subsystem, although most profitable are varieties of chinese cabbage, lettuce, basil, roses, tomatoes, okra, cantaloupe and bell peppers.[22]

Other species of vegetables that grow well in an aquaponic system include beans, peas, kohlrabi, watercress, taro, radishes, strawberries, melons, onions, turnips, parsnips, sweet potato and herbs.[citation needed]

Since plants at different growth stages require different amounts of minerals and nutrients, plant harvesting is staggered with seedings growing at the same time as mature plants. This ensures stable nutrient content in the water because of continuous symbiotic cleansing of toxins from the water.[24]



A Deep Water Culture hydroponics system where plant grow directly into the effluent rich water without a soil medium. Plants can be spaced closer together because the roots do not need to expand outwards to support the weight of the plant.


Plant placed into a nutrient rich water channel in a Nutrient film technique (NFT) system.

Animals: aquaculture


Filtered water from the hydroponics system drains into a catfish tank for re-circulation.

Freshwater fish are the most common aquatic animal raised using aquaponics, although freshwater crayfish and prawns are also sometimes used.[25]

In practice, tilapia are the most popular fish for home and commercial projects that are intended to raise edible fish, although barramundi, Silver Perch, Eel-tailed catfish or tandanus catfish, Jade perch and Murray cod are also used.[22]

For temperate climates when there isn't ability or desire to maintain water temperature, bluegill and catfish are suitable fish species for home systems. Koi and goldfish may also be used, if the fish in the system need not be edible.


Bacteria

Nitrification, the aerobic conversion of ammonia into nitrates, is one of the most important functions in an aquaponics system as it reduces the toxicity of the water for fish, and allows the resulting nitrate compounds to be removed by the plants for nourishment.[21]

Ammonia is steadily released into the water through the excreta and gills of fish as a product of their metabolism, but must be filtered out of the water since higher concentrations of ammonia (commonly between 0.5 and 1 ppm)[citation needed] can kill fish.

Although plants can absorb ammonia from the water to some degree, nitrates are assimilated more easily,[22] thereby efficiently reducing the toxicity of the water for fish.[21]

Ammonia can be converted into other nitrogenous compounds through healthy populations of:
In an aquaponics system, the bacteria responsible for this process form a bio-film on all solid surfaces throughout the system that are in constant contact with the water.

The submerged roots of the vegetables combined have a large surface area, so that many bacteria can accumulate there.

Together with the concentrations of ammonia and nitrites in the water, the surface area determines the speed with which nitrification takes place.

Care for these bacterial colonies is important as to regulate the full assimilation of ammonia and nitrite. This is why most aquaponics systems include a bio-filtering unit, which helps facilitate growth of these microorganisms.

Typically, after a system has stabilized ammonia levels range from 0.25 to 2.0 ppm; nitrite levels range from 0.25 to 1 ppm, and nitrate levels range from 2 to 150 ppm.[citation needed]

During system start-up, spikes may occur in the levels of ammonia (up to 6.0 ppm) and nitrite (up to 15 ppm), with nitrate levels peaking later in the start-up phase.[citation needed]

Since the nitrification process acidifies the water, non-sodium bases such as potassium hydroxide or calcium hydroxide can be added for neutralizing the water's pH[21] if insufficient quantities are naturally present in the water to provide a buffer against acidification.

In addition, selected minerals or nutrients such as iron can be added in addition to the fish waste that serves as the main source of nutrients to plants.[21]

A good way to deal with solids buildup in aquaponics is the use of worms, which liquefy the solid organic matter so that it can be utilized by the plants and/or animals.

 

Source: Wikipedia.org


Somebody Come and Play Today! Earn as You Learn, Grow as You Go!

The Man Inside the Man
from
Sinbad the Sailor Man
A
JMK's Production


Share this page





TTFN
CYA Later Taters!
Thanks for stopping by.

Donnie/Sinbad the Sailor Man

P.S. Sweet Sixteen My Breakout Year's Hottest and Fastest Growing Biz Op? Do You Want In? If You Do! Click Here and Sign Up!