Quantitative fertilization technology mainly includes two aspects. One is to adjust the proportion of nutrients such as nitrogen, phosphorus and potassium to become balanced fertilization. The other is to cooperate with different fertilizers to regulate the proportion of nutrient supply during the growth period, which is called fertilization package. The nitrogen, phosphorus and potassium fertilizers required for field crops are nitrogen (n) 10-15 kg per mu, phosphorus (p2o5) is about half of nitrogen fertilizer, and potassium (k2o) amount is between nitrogen application rate and phosphorus application rate. In the north, the amount of nitrogen applied is close to that in the south. Field crops have a short growth period. Generally, phosphorus and potassium fertilizers, especially phosphate fertilizers, are applied as a base fertilizer at one time, 30%-70% of nitrogen fertilizer (mostly 50%) as a base fertilizer, and the remaining nitrogen fertilizers are mainly used for top dressing in crop rapid growth period. . The base fertilizer can be applied with nitrogen, phosphorus and potassium compound fertilizers, or nitrogen, phosphorus and potassium fertilizers can be combined.
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