论文部分内容阅读
在苗木施肥中,我们用同位素~(15)N示踪法,对洋白蜡(Fraxinus Pennsylvanica)一年生播种苗的施肥问题进行了研究,以探讨洋白蜡对硫酸铵利用率与施肥技术的关系,以及与施肥技术有关的洋白蜡年生长规律和硫酸铵在土壤中的扩散问题。一、研究方法试验分田间试验与室内分析两个部分。田间试验在北京林业大学实验苗圃进行。试验地为潮土、轻壤,混合抽样测定土壤含
In the fertilization of nursery stock, we applied the isotope ~ (15) N tracing method to study the fertilization of annual seedlings of Fraxinus Pennsylvanica in order to investigate the relationship between the utilization of ammonium sulfate and fertilization technology The law of growth of foreign wax in relation to fertilization technology and the problem of ammonium sulfate diffusion in soil. First, research methods Test field test and laboratory analysis of two parts. Field trials in Beijing Forestry University experimental nursery. The test ground for the soil, light soil, soil samples were determined by mixed sampling