How to choose compound fertilizer?

How to choose compound fertilizer? Please introduce that compound fertilizer has the advantages of high nutrient content, few side components and good physical shape, which plays a very important role in balanced fertilization, improving fertilizer utilization efficiency and promoting high and stable yield of crops. But it also has some disadvantages, such as its nutrient proportion is always fixed, and the type, quantity and proportion of nutrient elements required by different soils and different crops are diverse. Therefore, it is best to test the soil before use to understand the texture and nutritional status of the field soil. in addition, we should also pay attention to the combined application of unit fertilizer in order to get better results. Compound fertilizer has a long fertilizer effect, and it is suitable to do a large number of experiments of base fertilizer. It shows that base application is better for both binary and ternary compound fertilizer. This is because compound fertilizer contains nitrogen, phosphorus, potassium and other nutrients, especially in the early stage of crops, which is very sensitive to phosphorus and potassium, so phosphorus and potassium fertilizer is required to be applied early as base fertilizer. Compound fertilizer is not suitable for seedling stage fertilizer and middle and late stage fertilizer to prevent greedy green growing. The decomposition of compound fertilizer is slow. For crops that use compound fertilizer as base fertilizer during sowing, according to the fertilizer demand law of different crops, available nitrogen fertilizer should be added in time to meet the nutritional needs of crops. The concentration of compound fertilizer varies greatly, so attention should be paid to the selection of appropriate concentration. At present, most compound fertilizers are allocated according to the average nutrient status of soil types and the proportion of crop fertilizer requirements in a certain region. There are high, medium and low concentration compound fertilizers on the market. Generally, the low concentration of total nutrients is between 25% and 30%, the medium concentration is between 30% and 40%, and the high concentration is above 40%. According to different regions, soils and crops, we should choose to use economical and efficient compound fertilizer. Generally, high concentration compound fertilizer is used in economic crops with good quality, less residue and high utilization rate. The concentration of compound fertilizer is high, so it is necessary to avoid direct contact between seeds and fertilizer. The nutrient content of compound fertilizer is high, and if it is in direct contact with seeds or seedling roots, it will affect seedling emergence or even burn seedlings and rot roots. When sowing, the distance between the seed and the application of compound fertilizer in holes and strips should be 5m / 10cm. If the proportion of raw materials of compound fertilizer is different, attention should be paid to the use of different brands and different concentrations of raw materials, and the production should be selected and used according to soil types and crop types. Compound fertilizer containing nitrate should not be used in leafy vegetables and paddy fields; compound fertilizer containing ammonium ion should not be used in saline-alkali soil; compound fertilizer containing potassium chloride or chloride ion should not be used in taboo crops or saline-alkali soil; compound fertilizer containing potassium sulfate should not be used in paddy field and acid soil. Otherwise, it will reduce the fertilizer efficiency and even poison the crops. Compound fertilizer contains two or more large amounts of elements, nitrogen surface application is easy to volatile loss or loss with Rain Water, phosphorus and potassium are easy to be fixed by the soil, especially phosphorus is less mobile in the soil, and it is not easy to be absorbed and utilized by crop roots when applied to the surface, and it is not conducive to deep root rooting. in case of drought, fertilizer can not be dissolved, fertilizer efficiency is even worse, so compound fertilizer should be deeply applied to cover soil. Click to get more compound fertilizer application techniques