The use of compound fertilizer can save the cost of packaging, transportation, distribution and application of fertilizer, and reduce the production cost; the compound fertilizer has small side effects, has little adverse effect on the soil, is small in hygroscopicity, is not easy to agglomerate, and is convenient to store and use, so it is very popular. . So, how to choose the compound fertilizer reasonably?

Considering soils with low alkalinity, low organic matter content and effective nitrogen and phosphorus deficiency, acid nitrogen and phosphorus compound fertilizers such as monoammonium phosphate or humic acid NPK fertilizers and nitrogen and phosphorus compound fertilizers should be used. . However, for a small number of red clay or acid brown loam, chemical alkaline compound fertilizers such as diammonium phosphate should be used.

Considering crop varieties, generally adopting nitrogen and phosphorus compound fertilizer for field crops, NPK ternary compound fertilizer for wheat field or high-yield field; dense crops such as wheat, rice and millet, suitable for powdery compound fertilizer; and thin cropping crops such as corn Granular compound fertilizer should be used, and phosphorus and potassium compound fertilizer should be used for legume crops. For some cash crops, ternary compound fertilizer should be used which is compatible with local soil and crops; root crops (lianthus, polygonatum), corn, late rice It is advisable to use a compound fertilizer with a relatively high potassium content.

Considering that the nutrient of compound fertilizer mixed with elemental fertilizer is fixed, it is necessary to better exert its yield increasing effect, and it should also be combined with the application of elemental fertilizer to adjust the needs of different nutrients in crops in different growth stages. For example, rice, corn, wheat and other crops require more nitrogen in the growing season. If diammonium phosphate with less nitrogen and less phosphorus is used, the amount of phosphorus should be calculated first, and the insufficient nitrogen should be supplemented with elemental nitrogen fertilizer.

Considering the application method such as base fertilizer, it is necessary to use granular compound fertilizer, and the higher the hardness of the particles, the better, in order to prolong the fertilizer effect; the compound fertilizer containing ammonium nitrogen is easily adsorbed by the soil, is not easy to be leached, and is suitable for various kinds. Soil and crops, but it is best to implement deep application to improve the utilization rate; for nitrate-nitrogen compound fertilizer, it is not adsorbed by soil and easily leached with water, so it is not suitable for application to paddy fields, but suitable for dryland crops. (Agricultural Science and Technology News)

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