根据我省年中多次采叶养蚕的特点,在施用氮肥的基础上寻求合理配施磷、钾肥以提高施肥的经济效益,我们于1983和1984年开展此项试验,现将试验结果整理如下。一、试验方法试验设在本所新种2年生桑树旱地,品种为“塘10×109”。试验地土壤含有效钾80.78ppm,速效磷7.25ppm,全N0.0635％。 According to the characteristics of many sericulture in the province during the year, based on the application of nitrogen fertilizer on the basis of rational allocation of phosphorus and potassium fertilizer to improve the economic efficiency of fertilization, we conducted this test in 1983 and 1984, the test results are collated as follows. First, the test method The test is located in the new species of 2-year-old mulberry dry land, the species is “pond 10 × 109”. Experimental soil contains 80.78ppm of available potassium, available phosphorus 7.25ppm, all N0.0635%.