Formulated fertilization combines nitrogen, phosphorus, potassium and trace elements, called formula fertilization. According to the test, the utilization rate of nitrogen is 30%~38% for single application of urea, and the utilization rate of nitrogen is increased by 58%-60% for formula application; the utilization rate of single application of phosphate fertilizer and phosphorus pentoxide is 12%-14%. For formula application, the utilization rate is increased by 35%-38%; the utilization rate of potassium chloride alone is only 31%-35%, and the application rate is increased by 57%-61%.
Deep application of nitrogen fertilizer with deep application of nitrogen fertilizer can effectively prevent nutrient loss and increase nitrogen utilization rate. According to the test: the ammonium bicarbonate is applied, the nitrogen utilization rate is 28.6%, and the deep application, the nitrogen utilization rate is increased to 58.6%; the urea application, the nitrogen utilization rate is 42%, the deep application, the nitrogen utilization rate Increase to more than 80%, especially the application of ammonium bicarbonate, it is easy to cause crop burning and poisoning.
Centralized application gives priority to limited fertilizers to low- and medium-yield fields. According to the test: the same amount of 5 kg of urea and potassium chloride are applied to the fields of high-yield, middle-yield and low-yield fields at the same time. The effect of increasing yield is very different. On average, 1 kg of urea is applied, and high-yield fields increase rice yield 3.5. In kilograms, the middle-income field increased the yield of rice by 5.8 kg, and the low-yield field increased the yield of rice by 8.8 kg.
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