Ways to reduce the pollution of vegetable fertilizers

First, re-apply organic fertilizer?

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 early

The application of nitrogen fertilizer as base fertilizer or top-dressing fertilizer at the seedling stage is conducive to the rapid growth of vegetables as soon as possible, which will help reduce the accumulation of nitrate in soil and vegetables. ?

2. Deep application of nitrogen fertilizer

Deep application of nitrogen fertilizer to the soil layer of 10-15 cm can reduce nitrogen loss, increase nitrogen fertilizer utilization, and reduce the accumulation of nitrate in vegetables. ?

3. Control the amount of nitrogen fertilizer

Nitrate accumulation in vegetables increased with the amount of nitrogen fertilizer applied. 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. Fertilization due to vegetables

Different kinds of vegetables have different degrees of absorption and accumulation of nitrates. Cabbage and green leafy vegetables are likely to accumulate nitrates, and nitrate-nitrogen fertilizers cannot be used. Solanaceous vegetables, fruit vegetables and root vegetables produce less accumulation of nitrates. Appropriate application, but should stop the application of nitrate nitrogen fertilizer within 15-30 days before harvest. ?

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.

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