Determination of Soil Bulk Density of Tillage Resistance by Soil Bulk Densitometer

The development of agricultural mechanization has resulted in more and more machines in the field, which has led to more and more severe soil compaction. Therefore, how to improve the operational effects of machines and reduce energy input in this new situation has become a common practice. issue concerned. Tillage is the most common and it is also a job that consumes more energy. Previous qualitative studies have pointed out that the bulk density and moisture content of field soils are the main factors affecting the cultivation resistance of machinery. Therefore, in order to more accurately estimate the farming energy input required for different soil bulk density and moisture content, it is necessary to establish a relationship model between soil bulk density and moisture content and tractor traction resistance through field experiments. Determination of soil bulk density can generally be measured using a soil bulk density meter, so that the results obtained are more accurate.

Using a soil bulk density meter to determine that, because the farmland soil contains agglomerates, organic matter and soil pores, the stress and strain produced by the soil in the process of farming components acting on the soil is extremely complicated, and there are still many difficulties in quantitative determination. However, the traction resistance of the tillage is determined mainly by the reaction force of the soil, and the soil reaction force depends on the soil strength and is consistent with the soil cohesion (usually measured with a soil hardness meter or a soil penetration meter, and the units are kg/cm3 and kPa/cm2, respectively). . The main factors affecting soil strength are cornices, organic matter, soil compaction, and moisture content. Therefore, the main factors affecting the tillage resistance are the soil bulk density and the moisture content in the case where the corn root and the organic matter are the same.

The results of soil bulk density test showed that the relationship between the cultivation resistance of the soil and the soil bulk density was a hyperbolic function and could be described by a model. The coefficients were determined by the specific soil conditions. In the case of small soil bulk density, the moisture content has little effect on the crop resistance; and the larger the soil bulk density, the more sensitive the crop resistance to moisture content. From the regression coefficients of the model, it can be seen that the square of the soil bulk density has significant influence on the tillage resistance, and the interaction between the bulk density and the water content is not obvious. Therefore, in the case of soil compaction or rolling by the unit, it will cause a drastic increase in the farming resistance and should be taken seriously. The model is relatively simple and has high fitting accuracy and can be used as a PQS relation model. It is of practical significance to estimate the energy input and traction efficiency of field machine operations under similar soil conditions.

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