Compound fertilizer has the advantages of high nutrient content, convenient application and high utilization rate. It plays an important role in balancing fertilization, improving the utilization of fertilizers, and promoting the high and stable yield of crops. However, due to the fixed proportion of nutrients contained in the compound fertilizer and the limited types of nutrients contained in the compound fertilizer, scientific and rational application in the production practice can achieve high yield and quality of the crop. 1. The application of compound fertilizer in combination with organic fertilizers and organic fertilizers can increase the utilization of fertilizers and nutrients. The application of organic fertilizer not only improves the soil, activates beneficial microorganisms in the soil, but also more importantly saves energy and reduces environmental pollution. In particular, the use of bio-organic fertilizer not only avoids the cumbersome process of traditional organic fertilizer production, but also provides a large number of beneficial microorganisms for soil, activates soil nutrients, and reduces continuous cropping obstacles. 2, for basal fertilizer or seed fertilizer as the main compound fertilizer contains nitrogen, phosphorus, potassium and other nutrients, particularly early crops of phosphorus and potassium are extremely sensitive, require phosphorus, potassium fertilizer as a base fertilizer early application, application must use particles Compound fertilizer, the higher the hardness of the particles, the better. 3. The deep-buried compound fertilizer contains 2 or more kinds of macroelements. The nitrogen forms volatile loss or rainwater loss. The phosphorus and potassium are easily fixed by the soil. Particularly, the phosphorus has a low mobility in the soil and is difficult to apply on the surface. The absorption and utilization by the roots of crops is also not conducive to the deep roots. In the case of drought, the fertilizers cannot be dissolved, and the fertilizer efficiency is even worse. Therefore, the application of compound fertilizer should be avoided as much as possible surface application. 4. The nutrient ratio of compound fertilizers combined with single fertilizers is difficult to fully meet the requirements for actual growth of crops on soils with different fertility levels. Therefore, it is necessary to use some single fertilizers according to the actual growth of the crops. For example, in nitrogen-deficient soils, some nitrogen fertilizers should be used for leafy vegetables that require more nitrogen. For potassium-deficient soils, some potassium fertilizers should be used for later-stage watermelons that require more potassium. 5. Potassium chloride and potassium sulfate are two kinds of potassium in compound fertilizers according to the crop. Chlorine crops containing potassium chloride compound fertilizer should not be applied. Non-supplementary chlorine crops with potassium sulfate compound fertilizer increase the cost of fertilizer application. Potassium chloride and potassium sulfate compound fertilizers are marked with "S" symbol on the packaging bag, compound fertilizers marked with "S" symbol are potassium sulfate compound fertilizers, and those without "S" symbol are all potassium chloride compound fertilizers. Never use chlorine crops.
Excerpted from China Agricultural Press>
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