When the chestnut fruit turns brown, the pre-harvest fertilizer is dominated by quick-acting fertilizers. The results of 50 kg of trees, each plant applied 1.5 to 2 kg of urea, potassium chloride 0.5 to 1 kg, after the rain to spread, or brewing of decomposed human and animal manure water 80 to 100 kg after spraying. The post-harvest fertilizer is applied within 5 to 10 days after the fruit is harvested, mainly NPK fertilizer and high-quality organic fertilizer, and 2 to 3 kg N, P and K compound fertilizer per plant is used to rake the cooked human and poultry manure 25 to 30. kg. Draw dripping lines around the canopy and dig deep, 25-30 cm wide ring ditch for fertilization.
If the weather is dry, fertilize every tree after fertilization and apply 80 to 100 kilograms of decomposed human or animal manure to promote fertilizer dissolution and transformation, which can improve the effect of fertilization. In addition, before and after fruit harvesting, we must spray fertilizer, spray 2 ~ 3 times 0.3% urea + 0.5% potassium dihydrogen phosphate + 0.2% borax mixture, can also choose other nutrient solution. It is best to choose a non-wind or breeze cloudy day when fertilizing. It is advisable to spray before the opening of the stomata before 9 o'clock in the morning or after 4 o'clock in the afternoon. After heavy spraying within 10 hours after spraying, it is necessary to re-spray and spray once every 7-10 days. The supplement of nutrients from the leaves will help the flower buds to grow strong and strong and the resulting mother buds to differentiate.
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