The use of compound fertilizer can save fertilizer packaging, transportation, distribution and application costs, reduce production costs; compound fertilizer has a small side effects, has a negative impact on the soil, moisture absorption is not easy to agglomerate, easy storage and use, and therefore popular . So, how to use compound fertilizer rationally?

Considering that the soil is slightly alkaline, the content of organic matter is low, and the available nitrogen and phosphorus are lacking, the acid nitrogen and phosphorus compound fertilizers, such as monoammonium phosphate or humic acid NPK fertilizer, and N and P compound fertilizers, should be used. . However, for a few red clays or acid brown loams, chemical alkaline fertilizers such as diammonium phosphate should be used.

Consider crop varieties that use nitrogen-phosphorus compound fertilizers for field crops, nitrogen, phosphorus and potassium ternary compound fertilizers for wheat fields or high-yield fields, and powdery compound fertilizers for wheat, rice, millet, etc.; sparsely planted crops such as corn. The granular compound fertilizer should be used. The legume crops should use phosphorus and potassium compound fertilizers. Some cash crops should use ternary compound fertilizers that are compatible with the local soil and crops; root crops (lotus root, jade bamboo), corn, and late rice. It is advisable to use a compound fertilizer with a relatively high potassium content.

Considering that nutrients mixed with single fertilizers and compound fertilizers are fixed, in order to better play its role in increasing production, it is also necessary to use single fertilizers in combination to adjust the needs of crops for different nutrients in different growth stages. Such as rice, corn, wheat and other crops, the need for more nitrogen in the growth phase, if the choice of nitrogen and phosphorus and more diammonium phosphate, you must first calculate the amount of phosphorus, insufficient nitrogen supplement with simple nitrogen fertilizer.

Consider the application method such as basal fertilizer, must use granular compound fertilizer, and the higher the hardness of the particles, the better to facilitate the extension of fertilizer efficiency; compound fertilizers containing ammonium nitrogen, easily absorbed by the soil, not easy to leaching, adapt to various Soils and crops, but it is best to implement deep facilities to improve the utilization rate; for nitrate-nitrogen compound fertilizers, it is not absorbed by the soil and is easily leached with water, so it is not suitable for application to paddy fields, but it is applicable to dryland crops.

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