Today, the application of chemical fertilizers is the main way to supply the nutrients needed for crop growth and development. However, in some areas, due to the lack of scientific and rational use of chemical fertilizers, the amount of fertilizer is increasing year by year, but due to heavy chemical fertilizers, or the application of chemical fertilizers. Single, or nitrogen, phosphorus, potassium ratio is not reasonable, and so on, often lead to soil compaction, low fertilizer utilization and input and output ratio is increasingly incompatible.
According to the survey: in the case of the same amount of application of nitrogen and phosphorus, the application of diammonium phosphate (or calcium) at the end of three consecutive years is far less effective than the alternating use of diammonium phosphate and calcium. The alternating method is to apply diammonium phosphate, calcium phosphate, diammonium phosphate, or calcium, diammonium phosphate, and calcium. The general use of chemical fertilizers is more than 50-100 kg per unit of chemical fertilizer. mu. The use of urea and ammonium bicarbonate is also basically used interchangeably for a three-year cumulative increase of 30--50 kg/mu.
According to the analysis, in the case of equal application of nitrogen and phosphorus, the reasons for the alternate use of chemical fertilizers are more than the single use. First, the long-term continuous use of any kind of fertilizer, the residual accumulation may change the physical and chemical properties of the soil, if several When the varieties are used interchangeably, this effect will be minimized. Second, the alternate use of different varieties of fertilizers can increase the content of different elements of the soil and facilitate the selection and utilization of crops. Therefore, when alternating fertilizer varieties are used, several suitable varieties can be alternately applied.
According to the survey: in the case of the same amount of application of nitrogen and phosphorus, the application of diammonium phosphate (or calcium) at the end of three consecutive years is far less effective than the alternating use of diammonium phosphate and calcium. The alternating method is to apply diammonium phosphate, calcium phosphate, diammonium phosphate, or calcium, diammonium phosphate, and calcium. The general use of chemical fertilizers is more than 50-100 kg per unit of chemical fertilizer. mu. The use of urea and ammonium bicarbonate is also basically used interchangeably for a three-year cumulative increase of 30--50 kg/mu.
According to the analysis, in the case of equal application of nitrogen and phosphorus, the reasons for the alternate use of chemical fertilizers are more than the single use. First, the long-term continuous use of any kind of fertilizer, the residual accumulation may change the physical and chemical properties of the soil, if several When the varieties are used interchangeably, this effect will be minimized. Second, the alternate use of different varieties of fertilizers can increase the content of different elements of the soil and facilitate the selection and utilization of crops. Therefore, when alternating fertilizer varieties are used, several suitable varieties can be alternately applied.
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