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关于土壤的宜耕性问题,前人曾做了不少研究工作。本试验的目的是对略低于塑限、塑限至粘着限间以及略高于粘着限的耕作状况进行比较,判定垆土的宜耕性。一、试验方法试验在西北农学院农作二站进行,供试土壤为垆土类中的黑油土和斑斑黑油土。这两种土均居中壤偏粘,粘结性较强,口紧难耕。测定项目和方法是(1)机械组成:吸管法;(2)有机质含量:И.В.丘林法;(3)塑限:搓条法;(4)粘着限:用电工刀刻划浸湿之土壤,当湿度降低到恰使土壤不再粘着刀面时,此时的湿度定为粘着限;(5)压实试验:用环刀取原状土,再
On the issue of soil tillage, predecessors have done a lot of research work. The purpose of this experiment was to compare the tillage conditions slightly below the plastic limit, the plastic limit to the adhesion limit and the slightly above the adhesion limit, to determine the tillage of the soil. First, the test method The experiment was conducted in Northwest College of Agriculture two stations for the test soil soil type of black soil and black spot soil. These two kinds of soil are in the clay partial sticky, strong adhesion, tight mouth hard tilling. Measurement items and methods are: (1) mechanical composition: pipette method; (2) organic matter content: И.В. Qiu Lin law; (3) plastic limit: rubbing method; Wet soil, when the humidity is reduced to just make the soil no longer stick knife face, the humidity at this time as the adhesion limit; (5) compaction test: