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According to the survey, in the case of equal application of nitrogen and phosphate fertilizers, the application of diammonium phosphate (or calcium phosphate) for three consecutive years is far less effective than the alternating application of diammonium phosphate and calcium. The method of alternate application is: three-year application of diammonium phosphate, calcium, diammonium phosphate, or calcium, diammonium phosphate, and calcium. Generally, alternating application increases the cumulative yield by 50-100 kg/mu over three years. The application of urea and ammonium bicarbonate is also better than the single application, and the cumulative yield is 30-50 kg/mu in three years.
According to the analysis, in the case of equal application of nitrogen and phosphate fertilizers, the reasons for the alternate application of chemical fertilizers are: First, long-term continuous application of any chemical fertilizer, the residual accumulation may change the physical and chemical properties of the soil, if several varieties Alternate application of chemical fertilizers will reduce this effect to a minimum; second, alternating application of different varieties of fertilizers can increase the content of different elements of the soil, which is conducive to the selection and utilization of crops. Therefore, when alternately applying fertilizer varieties, several suitable varieties can be selected for alternate application.
At present, the application of chemical fertilizer has become the main way to supply the nutrients needed for the growth and development of crops. However, due to the lack of scientific and rational knowledge of the application of chemical fertilizers, the application rate of chemical fertilizers has increased year by year. As a result, the application of chemical fertilizers or the application of chemical fertilizers Single, or the unreasonable ratio of nitrogen, phosphorus and potassium fertilizers, often cause soil compaction, reduced fertilizer utilization, and reduced input-output ratio.
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