First, the amount of fertilizer. In addition to considering the fertilizer requirement of poplar and the soil nutrient conditions of afforestation, the effects of poplar varieties, tree age, stand density and groundwater level should be considered. Generally, in the main production area of ​​poplar in our province, 40 kg of urea can be applied per mu, 60 kg of superphosphate, and 30 kg of potassium chloride. In addition, the necessary intermediate and trace element nutrients must be applied according to the results of soil analysis.
Second, the number of fertilization. The fertilization of poplars is carried out from April to May every year, and the fertilization effect is good twice in July-August, and each time the fertilizer is applied half of the annual fertilization amount.
Third, the fertilization method. According to the method of four-point acupoint application, according to the size of the poplar tree age, within the range of root distribution, four holes were uniformly circulated around the poplar, and the fertilizer was applied after the average application. The depth of fertilization is preferably about 15-30 cm depending on the age of the trees.
Second, the number of fertilization. The fertilization of poplars is carried out from April to May every year, and the fertilization effect is good twice in July-August, and each time the fertilizer is applied half of the annual fertilization amount.
Third, the fertilization method. According to the method of four-point acupoint application, according to the size of the poplar tree age, within the range of root distribution, four holes were uniformly circulated around the poplar, and the fertilizer was applied after the average application. The depth of fertilization is preferably about 15-30 cm depending on the age of the trees.
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