Method and device for measuring soil bulk density in real time

Abstract

The invention provides a method for measuring soil bulk density in real time. The method comprises the following steps of measuring soil under an undisturbed soil condition on line; acquiring a voltage signal of soil moisture volume percentage through a frequency domain reflection method, and determining the value of the soil moisture volume percentage through a calibration test method; acquiring the original spectral data of soil moisture weight percentage through a visible light-infrared reflection method, preprocessing the original spectral data and then substituting the data into a regression model preset in a system to calculate the soil moisture weight percentage; converting the soil bulk density from the soil moisture volume percentage and the soil moisture weight percentage. The invention also provides a device for measuring the soil bulk density. The device comprises a conical rod, a coaxial cable, an optical fiber, a soil moisture volume percentage probe, a soil moisture weight percentage probe, a soil moisture volume percentage detection module, a soil moisture weight percentage detection module and a panel computer. The method and the device which are provided by the invention can conveniently, fast and accurately obtain the soil bulk density of field soil at special section depth in real time without sampling the soil.

Description

technical field [0001] The invention relates to the field of measurement of farmland soil physical properties, in particular to a method and device for real-time measurement of soil bulk density. Background technique [0002] Soil bulk density, that is, soil dry bulk density, is defined as the ratio of the weight of a certain volume of soil (including soil particles and intergranular pores) after drying to the water weight of the same volume. The size of soil bulk density reflects the level of soil structure, air permeability, water permeability and water retention capacity, and is an important parameter to describe the physical properties of soil. Therefore, accurate determination of soil bulk density is of great significance to agricultural production and scientific research activities. [0003] The most commonly used method for determining soil bulk density is the ring knife method. The specific operation method is: smash a ring knife of a certain volume into the soil i...

AI Technical Summary

Problems solved by technology

Although this method does not need to dry the soil samples, the operation process and related devices are still complicated.

[0007] The above patents have improved the traditional soil bulk density measurement method in different aspects, but it is inevitable to sample the soil, which will not only damage the original state of the soil, but also make the measurement process difficult and time-consuming.

Images