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2. Direct dressing of superphosphate. Superphosphate contains 3.5-5% free acid, which is highly corrosive. For example, direct dressing of superphosphate, especially after long-term storage after seed dressing, it is easy to corrode the seeds and reduce the germination rate and emergence rate of seeds. Therefore, use superphosphate as a seed fertilizer, preferably a strip or a hole in the seeding ditch, and use soil to separate the fertilizer from the seed.
3. Disodium diphosphate is applied with water. After the application of diammonium phosphate with water, it is easy to cause the loss of nitrogen volatilization. Phosphorus only stays on the surface and is not easily sent to the rhizosphere of the crop. Crops have neither nitrogen nor phosphorus, and diammonium phosphate is not equivalent to white. Therefore, diammonium phosphate should promote the base application. If it is applied as a top dressing, it should be applied early, deep trenching, and soil after application. Generally, the fertilization ditch is about 10 cm deep.
4, the surface of the ammonium carbonate is shallow, the soil is not tight, resulting in low fertilizer utilization. Therefore, the application of ammonium bicarbonate requires deep application of soil and timely watering, so that ammonia is fully adsorbed by the soil to improve fertilizer efficiency. Tests have shown that the deep application of ammonium bicarbonate can increase the utilization rate by 10-30%.
1. After the urea topsoil is applied, it is eager to fill the water, and even the flooding with large water causes urea loss. Therefore, when applying urea, it should be applied by ditch application, strip application or acupoint application. The depth of fertilization should be 7-10 cm, then cover the soil immediately and pay attention to uniform fertilization. After 2-3 days in the summer, the water will be refilled after 6-8 days in spring and autumn.
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