Chestnut planting: why do chestnut trees need fertilizer before and after picking?

Why do chestnut trees need to be fertilized before and after picking? Can you tell me why? The fertilization of chestnut before and after picking is because chestnut has a long fruit hanging period, a large amount of fruit and a lot of nutrients, and before and after fruit ripening, the tree potential is already in a state of hunger and semi-hunger, which is very weak, which is disadvantageous to blossom and fruit in the second year. If we can timely apply pre-harvest and postharvest fertilizer and supplement nutrients, it can speed up the recovery of tree potential, promote strong tree potential, and lay a good foundation for high and stable yield in the second year. Fertilization methods can refer to the following: first, when the chestnut fruit turns brown, pre-harvest fertilizer is applied, mainly quick-acting fertilizer. As a result, trees with more than 50 kg of urea and 0.5 kg of potassium chloride are applied after rain, or retting 80 kg 100 kg of mature human and animal manure. 2. Applying postharvest fertilizer within 5-10 days after fruit harvest, mainly N-P-K compound fertilizer and high-quality organic fertilizer, 2kg N-P-K compound fertilizer per plant, 1.5kg peanut bran from retting and 25kg from poultry manure. Around the crown dripping line, dig a ring ditch of 25 cm in depth and 30 cm in width to fertilize. If the weather is dry, each tree should be drenched with clear water or retting to produce mature human and animal manure water of 80kg / 100kg after fertilization to promote the dissolution and transformation of fertilizer, supply root absorption and utilization, and improve the effect of fertilization. Third, before and after fruit harvest, foliar fertilizer should be sprayed for 3 times with 0.1% magnesium sulfate, 0.3% urea, 0.5% potassium dihydrogen phosphate and 0.1% triacontanol, once every 7 to 10 days. Click to get more chestnut planting techniques click to get more fruit planting techniques