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为达到以最经济的肥料用量和配比获得最佳的施肥效果,我们于1980—1981年做了这项试验研究工作。一、试验地情况试验是在北京林学院实验苗圃进行的,土壤为黄潮土,质地轻壤。有机质含量1.66—1.96％,全氮和速效磷含量较低,分别为0.077—0.085％和0.54—0.62毫克/100克土,速效钾含量较丰富,为0.018％,pH值7.6。年平均气温11.8℃,年降水量640毫米左右,多集
In order to achieve the best fertilization effect with the most economical amount of fertilizer and the ratio, we conducted this experimental study in 1980-1981. First, the experimental ground conditions The experiment was carried out in Beijing Forestry College experimental nursery, the soil is yellow Chao soil, texture light soil. Organic matter content 1.66-1.96%, total nitrogen and available phosphorus content were low, respectively 0.077-0.085% and 0.54-0.62 mg / 100 g soil, available potassium content is more abundant, 0.018%, pH 7.6. The average annual temperature of 11.8 ℃, the annual rainfall of about 640 mm, and more