Soil fertilization method Thin soil in the chestnut garden, in the chestnut crown drip line to excavate a circular ring groove, groove width 25 cm, depth 20 cm, each plant applied superphosphate 1 kg, urea 0.3 kg, borax 0.25 ~ 0.5 kg. Urea and borax should be first dissolved in water and then ditch, while spraying water while fertilizing, and use a hoe to mix the fertilizer and soil, so that fertilizer and water as soon as possible infiltration in the roots. After the fertilization, it should be backfilled in time to prevent the evaporation of nutrients. Farmers can also add appropriate amount of soil fertilizer to fertilize the soil, which will have a good effect on the results of chestnuts in the coming year.
After the root-to-fertilizing method, 0.3%-0.4% urea solution, 0.3%-0.5% potassium dihydrogen phosphate solution, and 0.3%-0.4% borax solution were mixed, and the tree crown was sprayed on a sunny day at 9:00 am or evening, every 10 days. Spray once and spray twice. If heavy rain falls within 10 hours after spraying, it must be sprayed again to ensure the effect of fertilization.
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