一、依据:土壤供应植物吸收有效氮素的能力,是说明土壤肥瘦的重要依据,是土壤肥力的重要指标。影响土壤供应有效养分能力的因素是很多的。但就土壤本身来讲,在较好的环境条仆下各种土壤的供肥能力是不同的。为了研究各种土壤本身的供肥特性,本实验是在控制良好的环境条件下进行的。 First, based on: Soil supply plants to absorb the capacity of effective nitrogen, is to explain the important basis for soil fat and thin, is an important indicator of soil fertility. There are many factors that affect the ability of soil to supply effective nutrients. However, in terms of the soil itself, the fertility of different soils under different circumstances is different. In order to study the characteristics of fertilizers for various soils, this experiment was conducted under well-controlled environmental conditions.