Conservation of Water: Irrigation with recycled water in Greenhouses

  • Article
  • Green house

ByNaanDanJain – Kobi Shilo 

As part of its efforts to take care of the environment through effective and efficient water managementNaanDanJain promotes irrigation with reclaimed water wherever possible

In today’s high-tech eramore and more growers are embracing greenhouse crops

Roses are one of the leading greenhouse crops in Israelgrown hydroponically on volcanic rock or rockwool

NaanDanJain has installed systems that exploit recycled water for irrigation of greenhouse crops as well as nearby fieldsorchards and plantations. 
 
One of the recycling projects designedsupplied and installed by NaanDanJain is at Moshav Renenin southern Israel

Runoff water from its greenhouses is reclaimed to irrigate the greenhouse rosessaving precious water and liquid fertilizers

The system also prevents puddlesweeds and other problems created by surplus water that has been left to waste

The growers of Moshav Renenhave saved a lot of money by recycling both water and fertilizers that were not absorbed by the plants in the first irrigation. 

Under the hydroponic systemwater and nutrients are absorbed directly by the roots during irrigation

Surplus water and fertilizer do not accumulate in the soilless substratecreating a runoff of up to 40%. The crops are irrigated up to 5 to 6 times a dayreaching 1.2 m3/hathereby creating a surplus of about 0.4 m3/ha. 

NaanDanJain recommends construction of a small tank at the end of the greenhousewherever possible

Runoff is collected in this tankand a pump returns water and nutrients to the greenhouseor pushes them out into drip laterals which irrigate vineyardsplantations or any other nearby crop. 

The water that is pumped from the tank is continuously tested by sensors to examine the water’s salinity and pH

The recycled water quality is relayed to a special computer that reads the test results and dilutes the run-off with fresh water accordingly 
 
An additional water conservation system has been designed on Moshav Renen to collect rainwater in the winterSpecial pipes installed on the greenhouse roofs direct rainwater to a 300 m3 tankThe rainwater is used to irrigate the greenhouse rosesas well as other nearby outdoor crops

This is excellent quality waterand is used for irrigation as well as for leaching of salt accumulated in the soil during the irrigation season. 

NaanDanJain is aware that conservation (reducereuserecycleis an essential element in any water policy

We are committed to effective water and fertilizer management through a variety of innovative techniquesincluding conservationwater reclamation and reuse. 

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