How to fertilize non-polluted leafy vegetables
2021-01-23 12:20:17
Leaf vegetables, including: Cabbage, Cabbage and other fertilization principles: the main organic fertilizer, focusing on the base fertilizer, reasonable fertilizer, control the amount of nitrogen fertilizer, advocate the use of special fertilizers and biological fertilizers, to stop the use of nitrate nitrogen fertilizer, soil testing formula, maintain Soil fertility balance. Apply base fertilizer: Ensure that the organic fertilizer applied is 4,000-5,000 kg/667 square meters, diammonium phosphate 30-40 kg/667 square meters, potassium sulfate 30-40 kg/667 square meters, or three-component fertilizer 80 kg/667 Square meters. Appropriate top-dressing: In the early and middle stages, slow-acting fertilizers can be applied, and 1,000 kilos/667 square meters of human fecal urine and 50–100 kg/667 square meters of plant ash, or 10 kg/667 square meters of compound fertilizer can be top-dressed. Appropriate post-appropriate follow-up of fast-acting ammonium bicarbonate 20-30 kg/667 square meters or urea 10 kg/667 square meters. Stop the use of harmful municipal waste and sludge, and do not use manure fertilizer for fertilizer during the harvesting stage. Due to vegetable fertilization: different varieties of vegetables, different levels of nitrate absorption, eggplant, pepper, carrots, tomatoes, carrots and other fruit and vegetables and root vegetables, lighter on the accumulation of nitrate, 20-30 days before harvest should be applied to the nitrate Nitrogen: cabbage, leaf lettuce, etc., for the accumulation of nitrate less, can be a small amount of application; cabbage, leeks, spinach, etc., it is easy to accumulate nitrate, is strictly prohibited the application of nitrate nitrogen. Spring vegetables less nitrogen: Spring vegetables light is weak, easy to accumulate nitrate, should not be applied or less nitrogen fertilizer; high fertilizer vegetable field should be disabled nitrogen fertilizer; low fertilizer vegetable land, vegetables, nitrate is lighter, can be applied nitrogen fertilizer, organic fertilizer Fertilizers; humus-rich soil, high levels of nitrate in vegetables, should be banned from nitrogen fertilizer. Do not apply nitrate fertilizer: ammonium nitrate, potassium nitrate, calcium nitrate and compound fertilizer containing nitrate nitrogen, easy to make vegetables accumulate nitrate, vegetable land basically should not be applied. Urea, ammonium bicarbonate, ammonium bisulfate, and ammonium acylamide should all be controlled in dosage so that they must be covered with soil. The deep application of nitrogen fertilizer covers the soil: deep in the soil about 15-18 cm, so that the slow nitrification, high fertilizer utilization, can reduce the accumulation of nitrate in vegetables. Control the amount of nitrogen fertilizer: The accumulation of nitrate in vegetables increases with the increase of fertilizer amount. The amount of fertilizer (667 square meters) should be controlled within 25 kg of standard nitrogen, and 60%-70% is used as the base fertilizer, and 30%. -40% for deep application of seedlings. Nitrogen fertilizer should be applied early: The best nitrogen fertilizer is applied during the seedling stage, which will help the vegetables grow early and grow quickly, which will reduce the accumulation of nitrate. Re-applying Organic Fertilizer: Organic fertilizers should be decomposed by high-temperature stacking to kill germs and eggs before use. This way, organic fertilizers will not cause nitrate pollution in vegetables, and they are not only of good quality but also resistant to storage. Biogas residue liquid has high efficiency and is often applied with fewer pests and diseases, which can reduce the amount of pesticides and increase the yield of vegetables.
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