Diammonium phosphate is applied with water. After diammonium phosphate is applied with water, it is very easy to cause the loss of nitrogen in the volatilization. Phosphorus also stays on the surface and is not easily sent to the root of the crop.
The shallow application of ammonium bicarbonate and the tight cover soil resulted in low fertilizer utilization.
After urea topsoil is applied, it is eager to irrigate, even with flood irrigation to cause loss of urea.
Superphosphate direct seed dressing. Superphosphate contains 3.5% to 5% free acid and is highly corrosive. If superphosphate is used for direct seed dressing, it can easily corrode seeds and reduce seed germination and emergence.
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