营养诊断施肥是林业现代化技术之一,是培育速生丰产林,缩短林木培育期,提高木材产量和质量不可缺少的技术。为此,近几年我们对落叶松中幼龄人工林进行了营养诊断和诊断施肥研究,通过大量采样分析,取得了判别林地是否需要施肥的土壤和针叶 Nutritional diagnosis and fertilization is one of the forestry modernization techniques, which is an indispensable technology for cultivating fast-growing and high-yielding forests, shortening the cultivation period of trees and raising the output and quality of timber. For this reason, in recent years, we conducted the nutrition diagnosis and diagnostic fertilization research on the young larch plantations. Through a lot of sampling and analysis, we obtained the soil and needle