The effect of increasing yield of compound fertilizers is related to soil fertility, crop types, fertilizer nutrient form, dosage and proportion, and application techniques.

First, due to soil application, the area of ​​potassium deficiency in soils in southern China has been continuously expanding, and the degree of phosphorus deficiency has moderated. Therefore, it is advisable to use nitrogen-potassium-based compound fertilizers. Phosphate fertilizer in most areas in the northern part of the effective potash fertilizer is not effective for the time being, it is advisable to use nitrogen-phosphorus-based compound fertilizers. However, in the economic crops and high-yield areas, nitrogen, phosphorus and potassium ternary compound fertilizers should be promoted, and the regular production net profit should be more significant.

Second, the application of sleepy crops will be based on the species tip and different nutritive characteristics of the appropriate and compound fertilizer varieties. For example, the use of tobacco-free ternary fertilizer can increase the thickness of tobacco leaves, improve the combustibility of tobacco leaves and sweet scent; fruit trees, watermelon and other crops application of three yuan compound fertilizer can reduce fruit acidity, improve sweetness; sugar cane, sugar beet, etc. The use of three compound fertilizers can increase the sugar content; cereal crops are mainly determined by the abundance of soil conservation. Special compound fertilizer fatalities require processing costs in the country, and are mostly used in economic crops, and the benefits will be higher.

Third, the nature of the application of compound fertilizers in the form of nutrients is mainly determined by their mode of cultivation. Nitrate-containing nitrogen is rarely used or not used in paddy fields. Mixtures of soluble phosphorus containing earthworms are more suitable for application on acidic soils; Ions should not be applied to chlorine-sensitive crops such as tobacco and potatoes.

Fourth, the main compound fertilizer in the presence of phosphorus or phosphorus potassium nutrients, while most of the fertilizer was granular, slower than the decomposition of simple chemical fertilizer, so as a base fertilizer or seed fertilizer is better. The Soil and Fertilizer Research Institute of the Chinese Academy of Agricultural Sciences conducted an inspection in North China in 1984. In the case of adding nitrogen fertilizer as a top dressing prior to crop growth, both binary and tribasic compound fertilizers are based on basic facilities and basal fertilizers are used. Fertilizer production was significantly reduced, and the reduction in output was above 6%. According to the test of wheat by the Soil and Fertilizer Institute of the Shaanxi Academy of Agricultural Sciences, no single nitrogen fertilizer was added during the growth of the crop; the effect of a single base fertilizer application of compound fertilizer was also good; and half of the base fertilizer was used.

In short, when the amount of compound fertilizer is more, base fertilizer is the main ingredient, and when the amount is less, concentrate fertilizer is used. In the growth stage, simple nitrogen fertilizer is applied according to seedlings. In the absence of basal fertilizer or basal fertilizer, early recovery of appropriate amount of compound fertilizer also has good knock-out effect. For the whole growth period of perennial crops, compound fertilizers with suitable nutrient ratios are applied, and the yield increase effect is also very good.

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