Open space is the main reason for the low yield of chestnut, which is caused by poor pollination and fertilization, and the trace elements such as boron, zinc and molybdenum are the main factors causing poor pollination and insemination. Because the chestnut tree lacks these trace elements, there will be less pollen, deformity, weak vitality, etc., affecting pollination and insemination. Therefore, in the summer and autumn, these trace elements are replenished in time to accumulate in the branches before the leaves fall. After the second year of germination, there are sufficient trace elements such as boron, zinc and molybdenum to supply the flowering needs, so that the pollination and insemination can be carried out smoothly. There will be no openness. The specific practices are as follows:
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In the summer and autumn combined with pre-harvesting and post-harvesting fertilizer, adding borax and zinc sulphate, each time a tree of 5 years or more per plant, or a tree of 50 kg or more, borax 0.25-0.50 kg, zinc sulfate 0.15~ 0.25 kg, mix well with other fertilizers, and dig shallow trenches under the canopy, then cover the soil.
In addition, during summer and autumn summer shoots and autumn shoots, 0.1% borax, 0.1% zinc sulfate, 0.1% ammonium molybdate mixture is sprayed every 10-15 days, and 600 times amino acid compound micro-fertilizer, 0.2% urea. 0.3% potassium dihydrogen phosphate and 0.1% magnesium sulfate mixture are sprayed together to promote the absorption of boron, zinc and molybdenum by the leaves, sprayed continuously for 3 to 5 times, evenly spray all the branches and leaves inside and outside the canopy to start to have water drops. It is advisable to drip down and add trace elements from the foliage.
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