First, re-apply organic fertilizer?
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Organic manure must be applied after high-temperature stacking or biogas fermentation and decomposing, which can kill pathogens and eggs, reduce the application of pesticides, and increase the yield and quality of vegetables. The use of biogas fertilizer is the best non-pollution vegetable. ?
Second, scientific application of nitrogen fertilizer?
1. Nitrogen fertilizer should be applied as a base fertilizer or as a top-dressing fertilizer during early seedling period, which is beneficial to the early growth of vegetables and helps to reduce the accumulation of nitrate in soil and vegetables. ?
2. Deep application of nitrogen fertilizer to cover soil N fertilizer applied deep to 10-15 cm in the soil layer, can reduce the loss of nitrogen, increase nitrogen fertilizer utilization, but also reduce the accumulation of nitrate in vegetables. ?
3. Control of nitrogen application amount The accumulation of nitrate in vegetables increased with the increase of nitrogen application amount. The amount of nitrogen applied per acre should be controlled within 30 kilograms, of which 70-80% should be applied as a deep basal fertilizer and 20-30% as a deep application for seedling fertilizer.
4. Do not apply or less apply nitrate nitrogen fertilizer?
Ammonium nitrogen fertilizers and ammonium ammonium fertilizers such as ammonium sulfate, ammonium bicarbonate, urea, etc. can be used. ?
Third, due to food and fertilizer?
1. Due to different types of vegetables fertilizing different types of vegetables, the extent of absorption of nitrate accumulation is different. Chinese cabbage and green leafy vegetables are prone to nitrate accumulation. Nitrate-nitrogen fertilizers cannot be used; solanaceous vegetables, fruit vegetables and root vegetables, and nitric acid. Fewer salt accumulations can be applied properly, but nitrate nitrogen fertilizer should be stopped within 15-30 days before harvesting. ?
2. Leaf vegetables should not be foliar fertilizer?
Leaf nitrogenous fertilizers are sprayed directly on the leafy vegetables. The ammonium nitrogen is easily converted into nitrate nitrogen and absorbed by the leaves. Other types of fertilizers are sprayed from the leaves and are also likely to contaminate the leaves.