Soil moisture real-time monitoring system for the determination of profile water and conductivity

In order to develop rice production under limited water resources conditions and achieve water-saving, yield-increasing and efficiency-improving purposes, the three water-saving rice technologies of shallow water, shallow moisture, and mulching have been applied for research and promotion. To further study the effects and sustainability of the ecological environment of various water-saving methods. Through the real-time soil moisture monitoring system, a total of three tests were conducted, namely shallow water irrigation, shallow wet irrigation and plastic film coverage. There are 6 communities and the area of ​​the plot is 40m×30m.

In order to understand the effects of different water-saving irrigation methods on soil moisture and nutrient conservation in spring, soil moisture content and electrical conductivity were measured in a soil profile about 3m deep in each test area of ​​soil moisture real-time monitoring system. The water cuts in shallow water and shallow wet sections are significantly larger than those in the coating treatment. This may be due to the fact that the moisture content of the sections before freezing is greater than that of the coating treatment. On the other hand, the heat preservation effect of the coating may affect the freezing process. In the process of moisture migration and infiltration of snow or rainfall in spring.

From the overall monitoring of the soil moisture real-time monitoring system, the soil moisture profiles in each area are at the peak in the 30-40cm soil layer. Because of the freezing process after entering the winter, the deep soil moisture continuously migrates to the upper layer, and the maximum freezing depth It appears in 140cm up and down. At the same time, the water content in the surface soil was reduced due to evaporation in the spring, and increased due to rainfall replenishment. Therefore, the surface soil moisture content was jagged.

In addition, the real-time soil moisture monitoring system also found that rice water-saving irrigation measures have a significant effect on the conductivity of soil solution in the surface layer of 30cm soil. The highest conductivity is the film-covered water-saving treatment, which shows that the best effect of fertilizer retention, followed by shallow water The worst treatment is shallow wet treatment. The soil moisture content under the film-covered water-saving irrigation and non-film-covered water-saving measures was significantly different in spring, and the soil moisture profile showing water-covered coating was significantly lower in the soil moisture real-time monitoring system than in the non-mulching section. In the case of water treatment, there was no significant difference between the two non-mulching treatments in shallow water and shallow wet irrigation.

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