论文部分内容阅读
土壤结构是土壤肥力的关键,这一概念已为人们所认识。要使甜菜高产优质,首先应有最适当的成苗率。欲达此目的又必须使土壤环境具有甜菜种子萌芽和出苗的有利条件。诸如温度、水分、空气以及土壤的碱度等都会影响萌芽。幼芽出苗,不但必须萌发,而且还必须穿透土层。除上述因子以外,土壤的机械阻力也影响出苗。石灰性土壤及盐渍化土壤易形成板结与土壤本身的物理性质有关。而机耕作业使土壤变为紧实,中之自然过程的降雨和干燥
Soil structure is the key to soil fertility, a concept that has been recognized. To make sugar beet high yield and quality, first of all should be the most appropriate rate of seedlings. In order to achieve this goal, it is necessary to make the soil environment favorable for the germination and emergence of beet seeds. Such as temperature, moisture, air and soil alkalinity and so will affect the bud. Emergence of young shoots, not only must germinate, but also must penetrate the soil. In addition to the above factors, soil mechanical resistance also affects emergence. Calcareous soil and salinized soil easily form a plate knot and the physical properties of the soil itself. Tillage operations turn soil into compaction, the natural process of rainfall and drying