subject: Greenhouse vegetables with dressing recipe [print this page] Greenhouse vegetables with dressing recipe
As Greenhouse vegetable fertilization large, closed in winter and spring were strict, and low temperature, light weak, vegetables with low nitrate reductase activity, easy to accumulate nitrate. How to reduce fertilizer nitrate accumulation in vegetables, is pollution-free vegetable fertilizer should pay attention to.
Prohibit application of nitrate fertilizer. Such as ammonium nitrate, ammonium, phosphorus and potassium nitrate, nitric acid phosphate, potassium nitrate and nitrate containing compound, after application is easy to accumulate nitrate vegetables. Because 80% of human intake of nitrate from vegetables, nitrate reducing conditions, the conversion to nitrite, nitrite and human intestine, stomach synthetic amines carcinogens?? Nitrosamines, leading to stomach, esophagus and other cancers and diabetes, and blood poisoning and brain, heart and other organs of oxygen, causing breathing difficulties, nausea and even death.
Control of nitrogen fertilizer. Nitrogen is essential for vegetable production of fertilizer, but not excessive use. For vegetables meet national pollution standards and international regulations, we must reduce the nitrate content in vegetables. To reduce the nitrogen application rate should be based on different vegetables, nutrient requirement, are generally ~ 10 kg per mu to 12 kg of nitrogen is appropriate, nitrogen to deep application, and to P and K with the administration or application of NPK fertilizer, implemented promptly covered with earth after the best use of facilities or a combination of fertilizer drip irrigation tube penetration into the roots of facilities, reduce wastage, improve efficiency, stop dressing 20 days before harvesting.
Application of ecological organic fertilizer. Produce a ton of ecological organic fertilizer, such as 2 cubic meters of fresh chicken manure and 2.5 cubic meters, 0.2 tons of straw ~ 0.3 tons of flour, cornmeal 5 kg, multi-dimensional enzyme Bacteria 8 kg of raw materials. First chicken manure and straw powder blending of water, Yong Shounie into a group, the fingers of water, but not dripping, let go of the bulk, water content of 45% is appropriate, then, add the cornmeal and multi enzyme bacteria, and then to mix evenly mixed, leaving no health block. Then heap piles and covered with insulation film. Spring, summer autumn and 5 days to 6 days to mature and ferment, the winter takes 7 to 10 days maturity. General heap 1 day to 3 days, the reactor temperature rises to 80 , in order to kill E. coli and eggs, chicken manure can be removed by the smell, after the compost loose change, dry, covered with white mycelium, two days after you can send a starter flavor. Mature compost, fertilizer can be a little dry. In addition, application of bio-organic fertilizer, humic acid fertilizer, improve soil and increase fertility, to create a good environment for the growth of pollution-free vegetables.
Implementation of fertilization. According to the characteristics of different vegetables need fertilizer for fertilizer and soil conditions, determine the nitrogen, phosphorus, potassium and trace elements suitable for consumption and the corresponding fertilization. According to relevant research results show that the greenhouse vegetables to nitrogen, phosphorus and potassium needs of the largest were: 75 days after planting cucumber ~ 140 days, tomato 30 days to 52 days, sweet pepper, 30 days to 60 days. The best ratio of chemical fertilizer cucumber 1:0.67:1.83, 1:0.38:1.75 tomato, sweet pepper to 1:0.38:1. Although trace elements in vegetables need little, but necessary, use foliar spray fertilizer, should be a good amount of standard. Such as ferrous sulfate was 0.1% ~ 0.3%, sulfuric acid addition of 0.05% and 0.2%, borax 0.3% to 0.5%, 0.02% ammonium molybdate 0 .05%, copper sulphate 0.02% -0.04%, can be combined with disease control spray Bordeaux mixture, both healing power they gain weight. Or spray when the urea plus 0.1% to 0.4%, potassium dihydrogen phosphate 0.2% ~ 0.3%. Note that leafy vegetables do not spray application, to avoid increasing the nitrate content. DAP should not be on more general vegetables require a lot of nitrogen and potassium, phosphorus required less potassium in the most need before and after flowering, then gradually decreased.
Limit the use of hormones. Some vegetable farmers do not speak the quality of vegetables, in order to pursue high yield, early maturity, the morning market, application of GA (920), ethephon, paclobutrazol and other hormone urge long, ripening and greatly reduce the quality of vegetables, one long-term consumption on health extremely unfavorable.
