Compounding (combined) fertilizers have a significant effect on the yield of fruit trees because of the various nutrients required for fruit trees. However, in the course of operation, the fruit trees are reduced due to improper selection or improper application. How to choose the right compound fertilizer, pay attention to the following points:
1. Pursue suitable compound fertilizer according to local soil characteristics. For farmers who are located in alkaline soils in the north, acid compound fertilizer should be purchased. On the contrary, farmers in southern acid soil should choose alkaline. Compound fertilizer; for soils with low organic matter content, it can generally be combined with the application of organic compound fertilizer or organic and inorganic compound fertilizer.
In addition, for the alkaline soil in the northwest, it is generally not suitable to select and apply the compound fertilizer produced by using 枸soluble phosphorus, potassium chloride and ammonium chloride as raw materials.
Second, according to the variety of crops to buy compound fertilizer for vegetables, fruit trees and other economic crops, especially root crops, because of the need for more potassium, should use the higher potassium-containing NPK compound fertilizer; for chlorine-free crops such as grapes, Potato, tobacco, sugar beet, etc. should not be applied with potassium chloride and ammonium chloride as raw materials to produce a compound fertilizer with high chloride ion content.
Third, according to the nature of fertilizers to buy compound fertilizer farmers friends should usually learn to understand and master a little about the common sense of fertilizer, easy to buy their own fertilizer. For example, GB15063-2001 national standard stipulates that the effective nutrient content of compound fertilizer (composite fertilizer) is divided into high, medium and low: high concentration of NPK ≥40%, medium concentration of NPK ≥30%, low concentration of nitrogen and phosphorus Potassium content ≥ 25%, excluding trace elements and medium elements; water-soluble phosphorus content ≥ 40%. The nutrient content is different, the quantity applied and the technical requirements are different, of course, the price is different.
Fourth, according to the fertilization method to purchase compound fertilizer to improve the fertilizer efficiency of compound fertilizer, different dosage forms of compound fertilizer should be used for different fertilization methods. For example, when making base fertilizer, it is necessary to purchase granular compound fertilizer, or to purchase compound fertilizer containing slow-release fertilizer, which has long fertilizer effect and is beneficial to increase the utilization rate of nitrogen. The effect of humic acid compound fertilizer is generally better than that of topdressing.
V. According to the principle of balanced fertilization, it is necessary to understand the characteristics of soil and the fertilizer requirement of crops. It is best to combine with soil testing and formula fertilization. According to the principle of balanced crop nutrition, according to the reasonable results of soil testing results, what is missing? What, to achieve a balanced supply of crop nutrients. Finally, it should be noted that the compound fertilizer is relatively fixed, must not be blindly selected and applied, nor can it be applied as a single fertilizer to avoid unnecessary loss and waste.
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