Mine safety is a broad term referring to the practice of controlling and managing a wide range of hazards associated with the life cycle of mining-related activities. Mine safety practice involves the implementation of recognised hazard controls and/or reduction of risks associated with mining activities to legally, socially and morally acceptable levels. While the fundamental principle of mine safety is to remove health and safety risks to mine workers, mining safety practice may also focus on the reduction of risks to plant (machinery) together with the structure and orebody of the mine. Ventilation Control System,Mine Ventilation System,Mine Control System,Mine Automatic System Dandong Dongfang Measurement & Control Technology Co., Ltd. , https://www.dfmc-tec.com
Field experiments and model simulations of soil moisture in cotton fields under drip irrigation under the membrane in the Xinjiang region are still very limited. Xinjiang is a region where China’s water resources are severely deficient. Agricultural production relies heavily on irrigation. Xinjiang is also the main producing area of ​​China’s cotton. In 2007, Xinjiang’s cotton production was 3.013 million tons, accounting for more than 40% of the country’s total output, which reached the world’s total cotton output. one tenth. The analysis of the soil water and heat conditions in the cotton field in this area was also performed using a soil moisture temperature tester.
At present, as a water-saving and high-yielding irrigation technology, the drip irrigation technology under the membrane has been widely used in cotton cultivation in Xinjiang. The distribution of soil water and heat is very important for crop growth. In particular, the plastic film can effectively play the role of insulation, and increase the emergence rate at the seedling stage. The plastic film can cut off evaporation, regulate soil water and heat conditions during the growth period of cotton, and promote crop growth. At present, there is a lack of field observation data on soil moisture in the drip-irrigated cotton fields under the membrane in Xinjiang. There has not been a systematic review of the characteristics of the ground temperature in the study. At the same time, most of the previous observation methods were manual observations and the data were not continuous. Most of the research was conducted on a typical day and was underrepresented. Based on the observation data from field trials in Korla, Xinjiang, Muwen conducts a comprehensive study on the soil water and heat conditions in the membrane drip irrigation cotton fields, and focuses on the analysis of the ground temperature changes at different stages, locations and under different cover conditions, with a view to soil water Based on the laws of thermal change, agricultural production practices are better developed.
The soil moisture temperature tester measured the soil water and heat under the membrane and found that the moisture and temperature in the soil affected each other, and there were differences in the soil temperature under different soil water content. The soil with low moisture content under direct sunlight warmed up quickly, and at night, the ground temperature Falling, soil with low moisture content cools quickly. While the soil moisture content significantly affects the change in the ground temperature, the mulching of the soil also changes the characteristics of the soil's water and heat sinks: the shallow soil without film has a low moisture content before the irrigation and a high ground temperature; however, in the deep layer, the ground temperature is directly affected by the solar radiation. The soil moisture in the film-covered soil was high, and the plastic film insulation effect was good. The soil temperature of the film-covered soil was higher at the depth of 20cm than that of the film-free 10C. After the irrigation, the moisture content of the entire soil layer of the film-covered and non-membrane-treated layer was increased, and the average volumetric moisture content was increased. Up to 17%} film cut off evaporation, reduce latent heat consumption, play a very good insulation effect, at all depths of the soil, the temperature of the film is higher than no film, the average temperature difference in the depth of 25cm reaches 20C. Plastic film cover effectively alleviates the contradiction between high ground temperature and low moisture content or low ground temperature and high moisture content, so that the soil reaches a better hydrothermal condition.
Soil moisture temperature tester for the determination of soil moisture in cotton under the membrane
Drip irrigation under the membrane plays an important role in the planting industry in arid regions. Through this method, cotton is planted and cultivated to analyze the hydrothermal conditions under the membrane. Through the analysis of soil temperature using the soil moisture temperature tester, it can be found that under the mulching conditions, the soil water and heat conditions have been improved, and the emergence and growth status of the crop have also been greatly improved. This is mainly because the evaporation of soil moisture is cut off, and the latent heat consumption is also reduced. The heat preservation of the mulching film further promoted the use of soil moisture; some studies also focused on the distribution fluxes of latent heat and sensible heat in cotton fields, and analyzed the changes of microclimate in the field under drip irrigation conditions.