Method for determining volume weight of soil and soil volume weight determination system

Abstract

The invention discloses a method for determining the volume weight of soil and a soil volume weight determination system. The method comprises the following steps: collecting a soil block under an undisturbed soil condition and determining to obtain the volume water content of the soil block; putting the soil block into a sealing bag; pumping air in the sealing bag and tightly fastening the sealing bag; weighing the weight of the soil block in the fastened sealing bag; putting the fastened sealing bag into a sealing container with a piston to obtain a first sealing container volume and a first sealing container air pressure; pushing the piston to slide to obtain a second sealing container volume and a second sealing container air pressure; obtaining the volume of the soil block in the fastened sealing bag according to obtained parameters; calculating a soil wet volume weight according to the volume of the soil block in the fastened sealing bag and the mass of the soil block in the fastened sealing bag; and obtaining a soil dry volume weight based on the soil wet volume weight and the volume water content of the soil block. With the adoption of the method for determining the volume weight of the soil and the soil volume weight determination system, the determination efficiency and the determination precision of the soil volume weight can be improved.

Description

technical field [0001] The invention relates to soil physical and chemical property measurement technology, in particular to a method for measuring soil bulk density and a soil bulk density measurement system. Background technique [0002] Soil bulk density refers to the dry mass per unit volume of soil in the field state. As a basic property of soil, soil bulk density can reflect the level of soil structure, air permeability, water permeability and water retention capacity. It is one of the most basic and important indicators to describe soil quality. Basic parameters for production and scientific research activities such as estimating the total amount of soil nutrients, evaluating soil permeability, evaluating soil tillage resistance, and calculating the three phases of soil. Therefore, in agricultural production and scientific research, the determination of soil bulk density is an indispensable work content for soil investigation and quality evaluation. [0003] In prac...

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Problems solved by technology

However, in the process of taking soil by this method, because the steel ring knife needs to be smashed into the soil, the soil is often squeezed strongly. Therefore, the measured soil bulk density is often higher than the real soil bulk density, and the measurement accuracy of the soil bulk density is still low. Moreover, if the soil gravel content is high, the ring knife method cannot be used because it is easy to cause damage to the steel ring knife, which also makes the ring knife method used in the field to quickly determine the soil bulk density subject to certain restrictions

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