Spraying nitrogen fertilizer is generally applied in the early and late growth stages of fruit trees, and is suitable for the combination of phosphorus and potassium fertilizers. The pre-application concentration of urea was 0.2% to 0.3%, and the post-application concentration was 0.3% to 0.5%. Decomposition of human excrement was 0.5% in the early stage and 10% in the latter stage. Phosphate fertilizer spraying should have the principle of less early period and more middle and late period. The effect of ammonium phosphate is best, the concentration is 0.5%-1%; the concentration of potassium dihydrogen phosphate is 0.2%-0.5%; the concentration of superphosphate is 1%-3%. Potash is mostly applied in the middle and late stages. Potassium sulfate and potassium nitrate application concentration of 0.3% to 0.5%; grass ash to 5 to 15 kg of water 0.5 kg, soak for 24 hours, the filter residue can be sprayed. Trace elements, such as leaves yellow and white chlorosis, during the growth period can be sprayed once every half month 0.3% ~ 0.5% ferrous sulfate solution. Found that the fruit shrinkage deformity, the appearance of dry spots, can be sprayed in the next year before and after flowering 0.3% to 0.5% borax.
Spraying time is best when it is sprayed on a semi-negative and windless day. The time should be before 10 o'clock in the morning and after 4 o'clock in the afternoon. Spraying nitrogen fertilizer at full flowering stage can increase fruit setting rate; spraying nitrogenous fertilizer at young fruit stage can promote the expansion of young fruit; Spraying nitrogenous fertilizer in the May and June and combining with phosphate fertilizer can effectively promote flower bud differentiation; spraying phosphorus and potassium fertilizer at later stage can increase sugar content and promote fruit sugar content. Coloring; trace elements can be sprayed before and after flowering.
Spraying method The spraying of leaves can be carried out alone, or several kinds of fertilizers can be sprayed or mixed with pesticides to save manpower. However, mixed spray should pay attention to fertilizer or pesticides can not produce fertilizer or injury. Urea is a neutral fertilizer that can be mixed with a variety of pesticides. Before fertilizers and pesticides are mixed, put a small amount of each solution into the same container. If no turbidity, sedimentation, or bubbles occur, it means that they can be mixed. Otherwise, they cannot be mixed.
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