In the late period of apple growth, when the fruit is rapidly inflated and near maturity, a large number of physiological fruit drop often occurs, which reduces the commercial quality of the fruit and reduces income. To prevent or reduce physiological fruit loss, the following measures can be taken.
According to the orchard's soil fertility and tree nutrient status, timely application of suitable amount of nitrogen, phosphorus, potassium and other fertilizers can be applied 20-30 days before the physiological fruit drop. Foliar fertilization in the apple close physiological drop period, can be sprayed with 0.5% urea and potassium dihydrogen phosphate solution 2 to 3 times. The use of a regulator to use a plant growth regulator before physiological fruit drop, spraying 30ppm (parts per million) of naphthaleneacetic acid solution 2 to 3 times, each interval of 10 to 15 days, can significantly inhibit apple physiological fruit drop.
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