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1. Time and amount of phosphate fertilizer applied to fruit trees Phosphate fertilizer is a slow fertilizer. It should be mixed with organic fertilizers in autumn and winter. The average organic fertilizer is 250 kg organic fertilizer, and the simple phosphate fertilizer such as diammonium phosphate is 4 to 5 kg. Fruit trees absorb a certain proportion of various ingredients, and insufficient nitrogen fertilizer will also limit the absorption of phosphate fertilizer. Orchards with poor soil quality can also be used in combination with phosphate fertilizers.
2. Phosphate Fertilization Method for Fruit Trees The absorption of fertilizer by fruit trees is mainly accomplished by capillary roots in the root system. Fertilization at the capillary roots can improve the utilization of fertilizers. The horizontal roots of the fruit trees are distributed from 1 to 1.5 times the canopy of the fruit trees, that is, at the edges of the canopy projection. Therefore, the location of the application of the base fertilizer is also at the edge of the crown projection. The application of base fertilizer also has certain requirements on the depth. Generally, the roots of apple, peach, plum and other fruit trees are distributed shallowly, about 40 cm; the roots of pears, grapes and other fruit trees are distributed deep, about 80 cm. The depth of fertilization should be determined according to the depth of the root system distribution. The fruit trees with deep root distribution should be dug properly, and the fruit trees with shallow root distribution should be applied shallowly.
3. Spraying potassium dihydrogen phosphate in the flowering period of fruit trees Spraying potassium dihydrogen phosphate on fruit trees can promote flower bud differentiation and have obvious yield increasing effects. Generally, potassium dihydrogen phosphate is sprayed once at the initial flowering and young fruit stages. According to the different varieties of fruit trees, it is sprayed according to the amount on the packaging bag of potassium dihydrogen phosphate; the fruit may be sprayed 2 to 4 times of phosphoric acid during the expansion period. Potassium dihydrogen can play a role in promoting fruit coloration.
Phosphate fertilizer is one of the important nutrient elements in the growth and development of fruit trees. The high yield of orchard must be supplemented with phosphate fertilizer. But pay attention to the following points:
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