First, the amount of fertilizer is not scientific fruit tree fertilization standards are difficult to unify everywhere, most of the fruit growers rely solely on experience and reference data on fertilization, often appear excessive fertilization cause fruit trees grow into flowers difficult phenomenon. Some are too much phosphate, causing zinc deficiency; some are too much potassium, causing calcium deficiency. Improvement measures: Abandon the original outdated fertilization standards, the amount of organic fertilizer applied per acre measured in cubic meters, do not use pounds or kilograms, organic fertilizer because of the different types of dry and wet differences, it is not good to use the weight to measure. Fertilizer dosage per acre depends on yield and quality. Fruit trees use less nitrogen fertilizer at a young age, and nitrogen, phosphorus, and potassium balance in a large year, and they vary by 20% depending on the amount of fruit consumed and the difference in soil fertility. ~30%. According to research, 2500 kilograms of apples per mu need 3 to 5 cubic meters of organic fertilizer, 17.5 kilograms of nitrogen fertilizer, 9 kilograms of phosphate fertilizer, and 13.75 kilograms of potash; 2500 kilograms of pears per mu need 3 cubic meters of organic fertilizer and 12 to 13 kilograms of nitrogen fertilizer. 8 kg of phosphate fertilizer and 10 kg of potassium fertilizer.

Second, the unfair combination of fertilizers Fruit trees need a variety of elements, of which nitrogen, phosphorus and potassium are the most important. For apples and pears, the ratio of nitrogen, phosphorus, and potassium is 1:0.5:1 for peach and 10:4:16 for peach. Many fruit growers in the production only pay attention to the supplement of nitrogen and phosphorus, and ignore the supplement of potassium and trace elements, which makes it difficult to improve the quality of fruit, and the phenomenon of serious size is very serious. Improvement measures: We must rationally and scientifically add three elements based on the application of organic fertilizer. In the absence of symptoms, organic fertilizers must be added to supplement trace elements. Conditional fertilization can be carried out.

Third, the application period is not scientific Many farmers do not pay attention to autumn basal fertilizer, but also pay little attention to phased fertilization, which directly affects the quality of fruit and increase production. The advantages of autumn basal fertilization: First, fruit trees can absorb the fertilizer applied to the reserve during the peak period of root growth in autumn; Second, autumn basal fertilizer can heal the broken roots in time, with little effect on the tree vigor. In contrast to basal fertilization in spring, the applied fertilizer cannot be absorbed and utilized at that time, and when the root breakage is large, the tree vigor is affected, and even fruit setting and flower bud differentiation are affected. Fertilization by stages is also very important. One-time fertilization will inevitably result in the waste of fertilizer and even the appearance of fertilizer damage. Improvement methods: Generally speaking, we must pay attention to autumn basal fertilization, 60% to 80% of the phosphate fertilizer should be applied in the form of basal fertilizer, combined with the application of a small amount of nitrogen and potassium fertilizer, applying 60% of nitrogen fertilizer in spring, the young fruit expansion period and flower bud differentiation During the period, appropriate amount of nitrogen, phosphorus, and potassium fertilizers are applied, and most of the potash fertilizer should be applied 20 days before fruit enlargement and fruit coloring.

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CAS: 157115-85-0
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