Solanaceous vegetables, including: tomato, pepper, eggplant and other fertilization principles: the main organic fertilizer, focusing on the base fertilizer, reasonable top dressing, control the amount of nitrogen fertilizer, promote the use of special fertilizers and biological fertilizers, soil testing formula to maintain the balance of soil fertility. Applying base fertilizer: ensure the application of sufficient organic fertilizer 4000 ~ 5000 kg / 667 square meters, with the application of diammonium phosphate 30 ~ 50 kg / 667 square meters, potassium sulfate 40 ~ 60 kg / 667 square meters or three yuan compound fertilizer 100 kg/667 square meters. Appropriate top-dressing: Each 667m2 can be applied to composted manure 1000kg/667m2 or urea 10kg/667m2. It is forbidden to use harmful municipal wastes and sludges. During the harvest stage, fertilizers cannot be topdressed with manure. Leaf vegetables, including: Cabbage, Cabbage and other fertilization principles: Focus on organic fertilizers, focus on base fertilizers, reasonably top-dressing fertilizers, control the amount of nitrogen fertilizers, advocate the use of special fertilizers and biological fertilizers, and prohibit the use of nitrate-nitrogen fertilizers, soil testing formulas, and maintenance Soil fertility balance. Apply base fertilizer: Ensure that the organic fertilizer applied is 4000 to 5000 kg/667 square meters, diammonium phosphate 30 to 40 kg/667 square meters, potassium sulfate 30 to 40 kg/667 square meters, or three-component compound fertilizer 80 kg/667 Square meters. Appropriate top-dressing: In the early and middle stages, slow-acting fertilizers can be used to top-dress manure urine 1000 kg/667 m2, plant ash 50–100 kg/667 m2, and ternary compound fertilizer 10 kg/667 m2. Post-appropriate topdressing of quick-acting ammonium bicarbonate 20-30 kg/667 square meters or urea 10 kg/667 square meters. It is forbidden to use harmful municipal wastes and sludge, and it is not possible to use manure-fertilizer in the harvesting stage. Due to vegetable fertilization: different types of vegetables, the degree of nitrate absorption is also different, eggplant, pepper, carrot, tomato, radish and other Fruit and vegetables and root vegetables, lighter accumulation of nitrate, 20-30 days before harvest should stop the application of nitrate Nitrogen: cabbage, leaf lettuce, etc., for the accumulation of nitrate, can be applied in small quantities; cabbage, leeks, spinach, etc., 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, vegetables, nitrate accumulation is lighter, can apply nitrogen fertilizer, organic fertilizer Soil fertility; Soils rich in humus, vegetables, high nitrate content, 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 accumulate nitrate in vegetables, vegetable fields simply should not be applied. Urea, ammonium bicarbonate, ammonium bisulfate, and ammonium acylamide should all be controlled in dosage, and must be covered with soil. The nitrogen fertilizer is applied to cover soil deeply: deep application is about 15 to 18 centimeters in the soil, so that the nitrification is slow and the fertilizer utilization rate is high, which 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 the amount of fertilizer. The amount of fertilizer (667 square meters) should be controlled within 25 kg of standard nitrogen, and 60% to 70% of it should be used as the base fertilizer, and 30%. ~40% is used as a deep application for seedlings. Nitrogen fertilizer should be applied early: nitrogen fertilizer is the best at the seedling stage, which helps the vegetables to grow early and grow quickly, which is beneficial to reduce the accumulation of nitrate. Re-apply organic fertilizer: organic fertilizer should be decomposed by high-temperature heaping, kill bacteria, eggs, after the application, so organic fertilizer will not cause nitrate pollution of vegetables, not only 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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