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The determination of soil moisture in the five models by the soil moisture multi-point monitor can be found that the soil moisture content is the highest at 10 cm depth in each model. No-tillage treatment of soil moisture at the depth of 0~100cm was generally smooth, with a large change at the surface of 20cm, and a small change of soil moisture at the depth of 20~100cm. The soil moisture in the other four tillage patterns decreased at the depth of 10~60cm, and increased at the depth of 70~100cm. In general, no-tillage stubble treatment has always maintained a higher soil moisture value, while the other four models 0-100cm depth of soil moisture with the depth of the fluctuations are generally consistent. In other words, with the increase of soil depth, the response of soil moisture with depth to different cover tillage patterns gradually becomes more and more complex. With the increase of soil depth, the soil moisture of each covered tillage model increases with depth. The degree of response is reduced. In addition, the vertical variation coefficient of soil moisture in the five cropping patterns was in the order of conventional tillage (0.1376)> shallow rotation coverage (0.1360)> traditional coverage (0.1309)> deep turning coverage (0.1265)> no-tillage tillage ( 0.1167) also shows that the variation of soil moisture in the conventional tillage with depth is the strongest, while the soil moisture in the no-tillage stubble is relatively weakest with depth.
In the five cover tillage modes, the soil water content of no-tillage stubble was the highest, followed by the soil moisture content of deep tillage coverage was slightly lower than that of no-tillage stubble retention, and the moisture content of shallow cover soil was similar to that of conventional cover soil. The traditional cultivation soil moisture The lowest content. In addition, since no-tillage leaves crops when summer corn is harvested, and other treatments are carried out at the time of sowing, the soil water content of the remaining four crops will fluctuate little when the moisture content of the other four treatments declines quickly within a certain period before sowing. Good preservation of soil moisture during the handover period of two crops.
Through analysis and summary of the measurement results of the soil moisture multi-point monitor, it can be roughly found that the five types of cover tillage patterns are at depths of 0 to 100 cm, so that the soil moisture content of the stubble-free tillers is the highest, and the soil moisture content of the next deep tillage covers is slightly lower than that of no-tillage. The remaining soil moisture content was similar to that of the conventional cover soil, and the soil moisture content of the conventional cultivation soil was the lowest. The coverage tillage pattern was more sensitive to precipitation than the traditional cultivation pattern at the depth of the crop root distribution range of 0 to 50 cm. Water can be stored at a depth where the crop is easier to use. At the depth of 50~100cm, the response degree of soil moisture and precipitation is relatively lower than the depth of 0~50cm. In terms of soil moisture storage capacity, the soil water storage capacity of no-tillage coverage was the highest, and the soil water storage capacity of shallow-sweep coverage and conventional tillage was relatively low. The water storage capacity of deep-turnover cover and conventionally-covered soil was relatively centered.
Measurement of Soil Moisture in Five Tillage Patterns of Returning Straw to Field with Multi-point Monitor of Soil Moisture
The application of straw returning technology in the semi-wet canal irrigation area in Northwest China has been widely used in recent years. There are many scientific theoretical foundations for the application benefit of straw mulching. However, the combination with tillage mode is still relatively small, and the traditional farming methods exist. The problem, from the combination of changing the way of straw mulching and farming systems, has explored a method and approach to increase soil water conservation capacity and reduce soil erosion in cultivated land. Five blocks of 5m@50m fields were selected in Daejeon. There were a total of 5 types of straws covered in the growing season. The modes of combining the protection with tillage and tillage were no tillage and stubble, leaving 10~15cm of corn stubble, and direct sowing; The plough depth is 35cm, covering the comminuted corn stalks after ploughing; traditional covering, plough depth of 25cm, covering the crushed corn stalks after ploughing; shallow-swirling covering, covering the comminuted corn stalks after ploughing, plough depth is 10~15cm; traditional ploughing, plough depth is 25cm. The length of corn stalks is 5~10cm, covering the amount of crop stalks produced by the former crop. The soil water content can be effectively measured scientifically using a soil moisture multipoint monitor.