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随着林业生产的发展,对于华北落叶松苗木质量的要求逐渐提高,而合理追肥和育苗地的选择是提高苗木质量的技术关键。近年来,我们在神池县进行了华北落叶松苗木追肥试验,取得初步效果,现初报如下。一、试验地条件为了使试验点有较大代表性,我们选择两个点进行试验。一是义井林场大赵庄作业区,代表海拔1400米以上,土壤较贫瘠,年均气温5℃以下的地区。另一是南坡底县苗圃,代表1400米以下,年均气温5℃以上,土壤较肥沃地区。两地土壤均为黄绵土类。二、试验方法1、选择1年生华北落叶松育苗地,苗木生长较整齐,苗木密度为平均16—18万株
With the development of forestry production, the requirements for the quality of Larix principis-rupprechtii seedlings gradually increase, and the choice of reasonable top-dressing and nursery area is the key to improve the quality of seedlings. In recent years, we carried out in Shenchi County, Larix principis-rupprech seed dressing test, and achieved initial results, the first report is as follows. First, the test conditions In order to make the test point is more representative, we choose two points for testing. One is the Zhaozhuang operation area of Yijing Forest Farm, representing an area of 1400 m above sea level with arid soil and an average annual temperature below 5 ℃. The other is the southern slope of the county nursery, representing 1400 meters below average annual temperature above 5 ℃, the soil more fertile areas. The two soils are loessial soil. Second, the test method 1, choose 1-year-old Larix principis-rupprechtii nursery stock, seedlings grow more neatly, seedling density of an average of 16-18 million