1, chase fertilizer in the physiological fruiting before the arrival of this, 20-30 days in advance under the tree topdressing nitrogen, phosphorus, potassium and other fertilizers. The amount of fertilizer should be determined according to the needs of the tree. If the basal fertilizer is applied adequately, it may not be chased; or when close to the physiological fruit drop, the foliar spray of 0.3%-0.5% urea and 0.% of potassium dihydrogen phosphate solution 2- 3 times. At the same time, timely irrigation should be carried out after topdressing in order to facilitate the rapid development of fertilizer efficiency. 2. Planting green manure orchards Planting green manure, such as Amorpha fruticosa, Rhizoma rhynchophylla, Eriobotrya japonica, can change soil structure, increase soil permeability, increase soil fertility, and prevent soil erosion. Reducing the damage of weeds is an effective measure to reduce physiological fruit loss. 3. Spraying hormones and trace elements According to practice, 0.2% borax or 1000 times vinegar semen is sprayed at the flowering stage to prevent falling flowers and reduce the loss of young flowers after flowering. For fruit trees with physiological fruit drop, timely spraying 10-30 ppm naphthalene acetic acid solution one month before fruit harvest can reduce fruit drop, promote fruit coloring, increase hardness, and improve storage stability. 4. Preventing early deciduous leaves is the main organ for manufacturing organic matter. Therefore, the key to the entire growing season is to protect the leaves. To prevent early defoliation, comprehensive prevention and control should be carried out. First, it is necessary to strengthen soil and fertilizer water management to improve disease resistance of fruit trees. Second, attention should be paid to clearing the garden to reduce the source of initial invasion. Third, to strengthen forecasting and timely and rational use of medicines, generally in mid-April. The first 2,000-fold lime-type Bordeaux mixture was sprayed and sprayed every 20 days until the spraying was stopped 20 days before picking. Can also be sprayed carbendazim WP 500-1000 times to control, the effect is good.
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During the growth and development of fruit trees, a large number of fruit drop caused by non-mechanical external forces and pest damage are called physiological fruit drop. It has been observed that the physiological fruit drops of apples, pears, peaches, grapes and other fruit trees are secondary, once in two weeks after flowering, the fruit develops into young fruit in the early period of rapid expansion; the second occurrence is after the first fruit drop 2-4 Week, often referred to as "June fruit drop." Some fruit trees, such as apples, have a phenomenon of fruit drop before fruit ripening, which is called "pre-harvest fruit drop." The lack of nutrients inside the tree body and poor external environmental conditions are the main causes of physiological fruit drop. The methods for preventing and reducing physiological fruit drop are as follows: