The threshold of soil moisture regression is the bottom line to control the regression of soil moisture, and it is also the minimum soil moisture standard for each irrigation. The control of soil moisture is strictly controlled. Each irrigation is increased successively on the basis of the previous irrigation, so that the soil moisture content is accumulated in successive irrigation. This accumulated irrigation ensures that the jujube tree will not suffer from water shortage. Therefore, the use of soil moisture analyzer has a certain role in the analysis and research of threshold value.
In order to ensure that there is no water deficit in jujube trees, the soil moisture of jujube trees needs to be in a relatively balanced state, so that the soil water added by irrigation and the soil water consumed by transpiration evaporation basically reach an equilibrium state. After the irrigation on June 29, the increasing rate of soil moisture measured by the soil moisture meter was 16.6%, and the daily decline rate of the regression of soil moisture on July 1-15 was 10.08%. The increasing rate was greater than the decreasing rate, indicating that the irrigation satisfied the soil moisture. With the need to subside, the soil moisture surplus was 6.52%.
From the analysis of the minimum threshold value of soil moisture extinction and the maximum value of the value of soil moisture meter, in order to ensure the normal growth of jujube trees, the soil moisture status of jujube trees should be maintained at more than 75% of the saturated soil moisture content (average minimum water content in the jujube tree growth period). Value/saturated water content of soil parameter). The minimum irrigation standard is the lowest average water content in which the soil moisture content is not lower than the maximum monthly (6-month) for the soil moisture deceleration rate, that is, no less than 68% of the saturated moisture content (the lowest average moisture content in the maximum monthly water deceleration rate/saturated soil) Water content); jujube tree average soil moisture content in the distribution of 37% to 45% is more appropriate.
In order to ensure that there is no water deficit in jujube trees, the soil moisture of jujube trees needs to be in a relatively balanced state, so that the soil water added by irrigation and the soil water consumed by transpiration evaporation basically reach an equilibrium state. After the irrigation on June 29, the increasing rate of soil moisture measured by the soil moisture meter was 16.6%, and the daily decline rate of the regression of soil moisture on July 1-15 was 10.08%. The increasing rate was greater than the decreasing rate, indicating that the irrigation satisfied the soil moisture. With the need to subside, the soil moisture surplus was 6.52%.
From the analysis of the minimum threshold value of soil moisture extinction and the maximum value of the value of soil moisture meter, in order to ensure the normal growth of jujube trees, the soil moisture status of jujube trees should be maintained at more than 75% of the saturated soil moisture content (average minimum water content in the jujube tree growth period). Value/saturated water content of soil parameter). The minimum irrigation standard is the lowest average water content in which the soil moisture content is not lower than the maximum monthly (6-month) for the soil moisture deceleration rate, that is, no less than 68% of the saturated moisture content (the lowest average moisture content in the maximum monthly water deceleration rate/saturated soil) Water content); jujube tree average soil moisture content in the distribution of 37% to 45% is more appropriate.
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