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我们在江苏省宁镇县的两块缺钾林地作施钾试验,其自然含钾量分别为20—45ppm和31—48ppm,收到了良好的效果。 1.促进幼树养分的吸收 1979年在试验林地选取40株2年生的杉树苗,分成两组,一组作根施硫酸钾的试验,另一组对照不施钾。4—11月份每半月采样分析。施钾后的幼树针叶氮磷钾含量分别为0.88—2.51％,0.31—0.45％和0.52—0.71％,比对照组养分含量分别提高23.9—88％、20.3—93.3％和66.7—84.3％。 2.提高幼树光合强度经电极法测定,3年生幼树喷施0.3—0.5％硫酸钾溶液,光合强
We have two potassium-deficient forests in Ningzhen County, Jiangsu Province for potassium test, the natural potassium content were 20-45ppm and 31-48ppm, received good results. 1. To promote nutrient absorption of saplings In 1979, 40 2-year-old fir seedlings were selected from the experimental plots and divided into two groups. One group was used for the root application of potassium sulfate, while the other group did not apply potassium. 4 - November every half month sample analysis. The contents of nitrogen, phosphorus, and potassium in young leaves after application of potassium were 0.88-2.51%, 0.31-0.45% and 0.52-0.71%, respectively, which increased by 23.9-88%, 20.3-93.3% and 66.7-84.3% respectively than the control group, . 2. To improve the photosynthetic seedling intensity determined by the electrode method, 3-year-old sap sprayed 0.3-0.5% potassium sulfate solution, strong photosynthesis