Announcements

Job offersmore »



Tweeting Growers

Top 5 - yesterday

Top 5 - last week

Top 5 - last month

Exchange ratesmore »




Emission-free cucumber cultivation on non buffered coco substrate?

Emission-free cultivation is possible. Wageningen UR's Greenhouse Horticulture and a consortium of companies has already shown this over the past few years with trials on stone wool, with cucumber and pepper crops. Last year, they also showed that buffered and rinsed coco substrate is also suitable for emission-free cultivation. But what about non-buffered coco substrates? And non-rinsed coco?

Retaining nitrogen 

On June 8th, a trial with high-wire cucumber crop was started on this subject. The cucumbers (variety High Power) are placed in two sections. In one section, the coco substrate was buffered and rinsed prior to cultivation. At the discharge of the rinsed water, sodium was removed from the substrate. "But in this rinse water there are also nitrates present, which contain nitrogen, which can be used again in cultivation," as the researchers know. "Therefore, we use non-buffered coco substrate in the other section, so that nitrogen remains in the recirculation system."

It is very important to watch the fertilizer ratio in the irrigation water. In particular, the proportion of sodium in the nutritional-EC must be monitored. 

The first fruits were harvested on June 23. And as yet, the crop is looking quite good, according to researchers. "The section with rinsed coco is slightly more generative, caused by a slightly higher EC in the nutrients. The crop in the non-rinsed section looks slightly fresher. The EC in the nutrients will be reduced slightly in both sections, in order to lower the EC in the drainage water. The crop could open a little more in each section, therefore 1 cup per m2 will be removed."



Emission-free cultivation
In the emission-free cultivation sections, two types of filtration filters are used this season. A MT-IBA filter is used. This type of Fiber Filtration filter uses thousands of wound fiber coils and can filter up to 0.4 μm of particles from the water. The filter removes floating substances, unwanted organisms, but leaves nutrients in the water. The second filter is a flatbed filter. Drainage water is passed over a filter cloth (35 μm, 35 g/m2 cloth), that traps the dirt and the filtered water passes through. This type of filter is supplied by Moor Filtertechniek.



Publication date: 8/30/2017

 


 

Other news in this sector:

11/21/2017 USAID to help Pakistan's chili sector become more competitive globally
11/21/2017 What are the optimum nutrient levels for hydroponic edible crops?
11/21/2017 Three million plants of Pir5 strawberries in Brazil
11/21/2017 "Efficient water use priority for Iran"
11/20/2017 Earliest evidence of eggplant seeds in Israel unearthed in City of David
11/20/2017 Partial replacement of PAR light by far red light in tomato
11/16/2017 Reduced ultraviolet light transmission increases insecticide longevity
11/15/2017 UK: Growers growing with a difference
11/14/2017 Indo-Dutch cooperation on crop residue management
11/14/2017 One step closer to crops with twice the yield
11/13/2017 Vegetable grafting: principles and practices
11/10/2017 More accurate crop research available
11/10/2017 US: $600,000 in grants to help specialty crop growers in Colorado
11/10/2017 South Africa: Western Cape could get Centre of Excellence
11/8/2017 Update on Dutch high wire trials in energy efficient systems
11/8/2017 Israeli season kicks off with high prospects, threats and opportunities
11/8/2017 US: Successful growing season with new arugula varieties
11/8/2017 Circadian clock discovery could help boost water efficiency in food plants
11/7/2017 Hungary to help modernise Uganda's agriculture sector
11/3/2017 US: Nebraska looks to solve global food security by sharing its knowledge of irrigation