Zinc and Boron should be supplemented in Postharvest Chestnut

At present, the yield of most chestnut orchards is not high, the plant yield is only 4-5 kg. Many Chinese chestnuts hang fruit trees with bracts and no chestnuts (that is, empty buds). The reason is that in addition to extensive management, it has a great relationship with the application of zinc and boron. Practice has proved that the supplementary application and spraying of zinc and boron micro-fertilizer after fruit picking of Chinese chestnut plays an important role in promoting flower differentiation, improving flower quality and ensuring yield and income increase in the coming year. After the harvest of foliar spraying zinc-boron Chinese chestnut, the temperature is still high, the light quality is good, and there is still a long time to fall leaves in winter. At this time, spraying zinc and boron solution on the leaf surface can increase the sap concentration and promote the flower. Differentiation, so that the rate of empty bracts in the coming year will be reduced by more than 50%. 0.2% borax and 0.2% zinc sulfate can be sprayed on both sides of the leaves. When spraying, it is best to choose cloudy days with no wind or breeze; on sunny days, it is appropriate to spray after 4 pm; and to ensure that there is no rain within 24 hours after spraying. To spray enough fat liquid, it is appropriate to fully wet the leaves without dripping. If there is rain within 24 hours after spraying, the spray must be replenished after the rain stops, but the concentration of fertilizer solution can be reduced appropriately, and the dosage can also be reduced as appropriate. If there are a large number of diseases and pests, the corresponding pesticides can be mixed into the fertilizer solution, but the amount of pesticides should be strictly calculated to prevent excessive and cause side effects. The application of zinc and boron in soil as base fertilizer and the application of zinc and boron together with organic fertilizer can exert fertilizer effect for a long time. The trench method is generally used. The method is: after fruit harvest, choose the time when the soil moisture is better or the soil is moist after rain, open a ditch at the crown dripping line, the ditch is 0. 4 meters wide and 0. 6 meters deep, and apply zinc-boron fertilizer and other organic fertilizer in the ditch. Results 100 grams of borax and zinc sulfate were applied to each tree, which was fully mixed with organic fertilizer and covered with soil. In case of dry weather, insufficient soil moisture should be watered first and then applied.