Different aspects of moisture content in tobacco-planting soil
The effective water content of different tobacco-planting soils varies greatly, and the effective water volume of the same soil generally decreases with the increase of soil thickness. In order to clarify the relationship between effective soil water content and physicochemical properties of soil, the correlation analysis between effective soil water content and soil physicochemical properties showed that the correlation coefficient between effective soil water content and soil bulk density in Guizhou tobacco-growing area was very large. Significantly negative correlations and correlations with capillary pore content are also very good, showing a very significant positive correlation, ie, the smaller the soil bulk density, the more capillary pores there are, and the higher the effective moisture content. The correlation between effective soil water content and soil organic matter content in the test soil was relatively significant, showing a significant positive correlation, that is, by increasing soil organic matter content, the soil's effective water content could be increased.
The moisture content of tobacco-planting soil showed a decreasing trend with the increase of soil water suction, and it decreased sharply before 0.06×105Pa, and then it was slower. That is, when the suction was low, the soil characteristic curves were steep, with suction. The increase gradually becomes flat; soil moisture can be measured by the wireless public opinion monitoring system. The soil water characteristic curves at different depths of the same collection point are basically similar to the change trend, but there is a significant difference in the degree of increase or decrease; the water retention characteristics of soil layers at different depths at the same collection point do not reflect the obvious vertical change rule. Their water retention characteristics still depend mainly on physicochemical properties. The wireless public opinion monitoring system is used to measure and record the changes of soil moisture in time, and water supply points are used for research.
The water supply performance of different tobacco-planting soils was significantly related to the specific gravity of specific water volume, capillary pores, and clay particle content of less than 0.002 mm. Among them, the specific water capacity was significantly positively correlated with capillary pores in the entire suction stage, and was less than that in the soil particle composition. The 0.002 mm cohesive content was extremely significantly negatively correlated with low and medium suction. It shows that increasing the porosity of soil capillary can promote the water supply capacity of the whole suction range; reducing the content of clay can promote the water supply capacity of the soil in the low suction stage; in addition, increasing the content of organic matter can also increase the specific water capacity of soil. , thereby increasing the effectiveness of soil moisture. Therefore, in actual production, timely and proper soil loosening and straw returning to the field can increase the effectiveness of soil moisture and ensure that tobacco seedlings get sufficient moisture.
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