Aquaponics is farming with a fishing rod in Israel

Aquaponics is farming with a fishing rod in Israel

Chinese proverb: Give a man a fish, and you feed him for the day. Give him a fishing rod and feed him for life. 
New Israeli proverb: Give a man a fishing rod and a hydroponics farm, and you give him food and sustainable income for life.

The new Israeli proverb could be summed up in a word as aquaponics.

Moti Cohen is pioneering a new spin on an old method, in Israel. His approach is a combination of aquaculture (fish farming) and hydroponics (growing plants on water).

He’s building aquaponics farms and is consulting for agencies, such as the United Nations, on how to make aquafarms successful.

The idea is to create a circular farm that provides people with fish and plants to eat in a closed loop. The crops feed off the waste created by the fish, while the fish thrive on the oxygen made by the crops. Both become an important source of nutrients for the people –– with no waste, fertilizer or much water needed.

The “brilliant” idea is an age-old one, Cohen says. It is just starting to see a modern revival.

Moti Cohen (right) at a Google Hackathon in Tel Aviv.

In ancient Asia, for instance, rice growers discovered they got better yield when fish were in the rice paddies following floods. The Aztecs, too, developed aquaponics, and there are still people around the word growing using this method, Cohen tells ISRAEL21c.

“It is an ancient method that we can bring up to speed now that we have electricity and fish ponds and great technologies to make aquaponics better than it ever has been,” he says.

The new movement is still young. “We are talking about dozens of years. We are still missing a lot of experts and refining the growing methods. People are inventing new things every day, and the promise is huge.”

Cohen’s private company based in Hofit, Israel, is called LivinGreen Urban Ecosystems. They have built nearly 1,000 aquaponics systems, mostly based on individual needs.

Some are do-it-yourself kits, while in other instances Cohen will operate as a special consultant to NGOs or aid agencies to help them get their self-sustaining farms off the ground and sometimes off the grid.

Systems built with customers in mind

“Our approach is to the customer,” he says. “This is our main advantage. We are not just doing aquaponics.

“For instance, there is a hotel in Zanzibar and we have started talking about doing projects there. They have to buy all their fish and plants to eat from the mainland. But we can support the hotel in an integrated system right on the island.

“We can also connect with Israeli companies like Eco Gas, using hydroponics and biogas, so it really varies.”

The beauty of it all is that the “farms” can be built on rooftops or vertically, wherever space or land might be a challenge. Cohen has consulted for the United Nation’s Food and Agriculture Organization (FAO) with UK partner Christopher Somerville. Together they wrote the aquaponics manual for the FAO.

Cohen has given technical support even to urban farmers in Gaza, the West Bank and Jordan. With Somerville, he is working to advise a group in Ethiopia on building “smart fish” greenhouses. There is another non-profit in Cambodia.

Aquaponics provides fish and crops in a closed-loop system.

LivinGreen employs four people and was founded in 2010. Cohen, 32, studied at the School of Marine Sciences in Michmoret, not far from Hofit on the Mediterranean shore.

Today, led by Cohen, the unique company provides complete systems with consulting, special consultancy and supplies, as well as fish.

Researchers fine-tuning fish farms

Ben-Gurion University researcher Dina Zilberg heads a lab working to improve fish health on fish farms.

She says that while the scientific evidence is not yet there, she is sure that aquaponics –– rearing fish in ponds with plants in water that consume fish waste –– is much healthier for the fish than if they were without the plants.

Fish farming can be a pretty stressful environment for the fish, she says. She sees it in their fatty livers, probably from poor feed, or overfeeding, and what happens when one “rotten apple” of a fish can contaminate and kill others in the closed-loop system.

The main difficulty she sees with the widespread use of aquaponics is that it requires a certain amount of expertise in both fish health and plants. “In all these integrated systems, you need to be an expert while producing both plants and fish intensively. From what I know, many of the plants don’t do such a good job in removing all the nutrients and a biological filter is still required,” she tells ISRAEL21c.

She thinks aquaponics might make the most sense for family farmers who might be operating smaller units for their own consumption.

Cohen agrees that aquaponics is not suitable for every place and time, and is not a silver-bullet answer for developing nations.

LivinGreen systems cost about $1,000 and up. Customers can expect about 80 pounds of fish a year from the most basic and small systems –– with lettuce and veggies aplenty.

- See more at: http://www.greenprophet.com/2013/12/aquaponics-israel/#sthash.4wYZNFQB.dpuf




全日照  8個小時日照 瓜類、茄果類、豆類、山藥、豆薯(地瓜)。番茄、黃瓜、茄子、辣椒等喜溫中、強光性









菜豆生育過程中,主要吸收鉀和氮較多,還要吸收一定量的磷和鈣,才能良好發育。結莢期吸收磷鉀量較大。磷鉀肥對菜豆植株的生長發育、根瘤菌的發育、花芽分化、開花結莢和種子的發育等均有影響。缺乏磷肥,菜豆嫩莢和種子的品質和產量就會降低。缺鈣,幼葉葉片捲曲,葉緣失綠和生長點死亡。缺硼,則根係不發達,影響根瘤菌固氮,使花和豆莢發育不良。 耐陰半陰(大概3-4小時日照) 應選擇耐陰的蔬菜種植,如萵…


何謂硝酸鹽硝酸鹽是一種自然物質 硝酸鹽來自於氮素。氮素是植物生長必須的養分,植物有了氮素才會生長健康。而氮素是自然物質,空氣有有80%氮氣,下雨過後,氮素隨雨落下,存在大土壤裡。像森林一樣,通常植物殘體和落葉堆肥,就能一直循環使用大地中的氮素。而豆科植物更是固氮作物。如果作物採收過快,則需要施肥。

氮素怎麼會變成硝酸鹽? 氮素會被土壤中的細菌分解為硝酸鹽(硝化作用),植物吸收硝酸鹽,再把硝酸鹽製造成氨基酸與蛋白質。植物吸收的硝酸鹽,是在夜裡發生的,硝酸鹽得經過充分的日照,經過光合作用才能轉化為氨基酸與蛋白質。所以,胺基酸是在白天製造的。葉菜裡頭,一定會同時含有氨基酸與蛋白質、硝酸鹽。光合作用的(日照)時間長一些,硝酸鹽就會少一些。



硝酸鹽是壞東西? 人體有80%以上的硝酸鹽,來自於蔬菜,尤其是葉菜類,難道它只對身體有害?

吃的不對,硝酸鹽變成壞東西 如果清楚蔬菜營養成分,就會明白大自然的神奇安排。怎麼讓硝酸鹽要變成一氧化氮?原來是維生素C&E,吃葉菜的時候,就會同時攝取到維生素C&E、硝酸鹽。所以吃新鮮的菜很重要,新鮮採收的菜才能留住維生素。洗菜的方式更重要,很多長輩習慣切完菜再洗、或者反覆戳洗葉片、或者一直泡水,維生素易溶於水,水都是綠色了,菜就沒維生素了。

是誰讓硝酸鹽要變成亞硝酸胺? 口腔跟胃內的細菌,會把硝酸鹽變成了亞硝酸鹽,亞硝酸鹽遇到了胺類,就會變成可怕的亞硝酸胺。我們的胃部裡怎麼會有胺類?哪些食物含有胺類?


水耕栽培-精緻蔬菜生產技術之開發文/高德錚 為穩定台灣夏季蔬菜之產銷及提昇蔬菜之品質,使國人能享受既便宜又無農藥殘毒之清潔蔬菜,台中農改場在農委會及農林廳經費補助下正積極研究無土水耕栽培技術,希望發展出一套既可提供家庭主婦在公寓陽台上或屋頂上生產蔬菜,又可藉『植物工廠』年中無休地生產蔬菜。
(8)不懼農村老齡化。岩棉栽培法 栽培介質:岩棉(rockwool)為人造之礦石纖維(圖一),與坊間之石棉(asbestos)不同,石棉可由天然礦石中開採取得,岩棉為玄武岩或輝綠岩等礦石在1,600℃下熔融後,利用高速離心設備使岩漿形成微粒液滴,諸液滴因高速離心運動露於空氣中…