Fertilizer taboo for vegetables

Improper application of chemical fertilizers to vegetables can cause toxic side effects, which can waste both material and human health. Practice has proved that vegetables and fertilizers should pay attention to "six bogeys." 1. Avoid leafy vegetables such as ammonium nitrate, Chinese cabbage, leeks, spinach, celery, cabbage, etc. It is easy to absorb nitrate nitrogen during growth. For example, ammonium nitrate is used, and green leaf vegetables absorb nitrates and ions. After the salt enters the body, it can accumulate poison over time. Second, avoid application of urea immediately after watering The nitrogen contained in urea is Ammonium Amide. Ammonium Ammonium is converted to Ammonium Carbonate or Ammonium Bicarbonate by the urease enzyme secreted by soil microorganisms. If urea is applied immediately after watering or it encounters rain, ammonium nitrate will be lost. Therefore, urea, whether it is used as vegetable or topdressing, should be applied for 5-6 days after it is applied, so that it can be fully converted and then watered. So as not to cause loss. Third, avoid repeated application of ammonium sulfate in acidic soils or calcareous vegetable fields, if the continuous application of ammonium sulfate, acidic soil will become more acidic, so that calcareous soil hardening, leading to poor vegetable growth, yield decline. 4. The use of ammonium bicarbonate in the water shortage of boiled vegetable fields is extremely unstable and easy to exert. When applying ammonium bicarbonate in vegetable fields, either base fertilizer or top dressing should be applied under conditions of moist vegetable fields, and the soil should be covered immediately after application. In case of drought, the water can be poured or watered after application. Fifth, avoid excessive use of calcium in vegetable fields as a large number of superphosphate in successive years, especially in the case of an application rate of more than 40 kilograms per mu, will seriously affect the vegetable growth, so that vegetables easily dry, premature plant failure, poor growth, yield Reduced, quality deteriorated. Mushi 10-20 kg is generally good, fruits and vegetables can be given more appropriate. Sixth, avoid spraying high concentrations of nitrogen fertilizer leaf vegetables such as urea, ammonium sulfate sprayed on the foliage, although the vegetable leaves fertilizer, good color, but the harmful salts in the green leaf content will also increase significantly, and then affect human health .

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