The main reason for the low chestnut yield and high emptying rate is caused by the lack of application of boron and zinc fertilizer during the management process. When the content of available boron in the soil is lower than 0.5ppm, the normal fertilization process of chestnut will be affected, resulting in the stagnation of early embryonic development and the formation of emptiness. Production can capture the favorable time from fruit picking to deciduous before this, make-up application of boron and zinc fertilizer, in order to promote chestnut tree flower bud differentiation, improve flower quality, and lay a solid foundation for the heavy weight of chestnut pods. Usually take the following two methods: 1, leaf spray. As an auxiliary measure for soil fertilization, it has the advantages of simple method, less fertilizer, rapid effect, high utilization rate, and no effect of redistribution of tree nutrients. Usually 0.2% borax plus 0.2% zinc sulfate mixture for foliar spray. The time should be chosen in the morning when the dew does not dry or in the evening, moist and windless weather. 2, the root spread. After harvesting the fruit, ditches in the canopy dripping line, which is the most widely distributed fibrous roots, are to be dug 1 meter long, 0.4 meter wide, and 0.6 meter deep. Boron-zinc micro-fertilizer and other organic fertilizers are applied and the soil is then covered. The amount of boron and zinc applied is calculated as the size of the crown, with 10-20 grams of boron and zinc per square meter. For the result tree, 100 grams of borax and zinc sulfate can be applied. The application of boron and zinc fertilizer once to the soil has obvious effect in five years, and can reduce the emptying rate from 50% to 5%.
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