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Through the soil temperature and humidity recorder, it was found that the highest and lowest temperatures in all layers were the highest with wide film coverage, followed by the narrow film night lid, and the lowest live temperature, and the temperature difference was the most obvious at the 51â„2 meter depth of Wangpo. The average daily temperature and width of the film is 5.9°C higher than that of the live broadcast, and the narrow film is 2.8°C higher than the direct broadcast. The seed penetration difference decreases with depth. In general, the mulching film cover sunny day is significantly warmer than the cloudy day and the sunny day is noon. On cloudy days, warmer temperatures will occur sooner or later. The lowest temperature on the surface of the soil is narrow and the width of the membrane is 2°C and 1.8t, respectively. The maximum temperature on the soil surface is wide, and the difference between narrow membranes is not obvious. The experiment also found that On the day when the average temperature is above 20°C, the maximum temperature in the narrow film is higher than the maximum temperature in the wide film. For example, when the continuous high temperature helium occurs on April 19-24, the average daily temperature is between 21-23°C. Within a narrow film, the maximum temperature in centimeters is inversely proportional to the width of the film, which is 2-3°C, resulting in different degrees of burning.
Using the comparison of the results of the soil temperature and humidity recorder, it was also concluded that the change in soil moisture was reduced due to the cover of the plastic film. The mean value of the soil moisture in all levels of the b-50 cm was 31.T, which was the highest in the narrow film. The width of the membrane was 30.3 intestine, followed by 30 and 1 in the intestine. The difference in soil moisture was smallest at all levels of the cover of the narrow membrane. However, the degree of soil was different in different weathers. The humidity of the narrow-film soil in rainy weather was slightly lower than that of the soil in direct broadcast. It can be preliminarily considered that the narrow-film lid has a good effect of protecting the lid.
The mulching of the mulching film can warm up the soil in the early stage of planting, and prevent the influence of bad weather. The width of the mulching film is also different, and whether the influence of different widths on the soil temperature and humidity is consistent is not certain, and there are no thoughts about the conclusion of the study. In order to conduct this study, three treatments, a cotton wide film (80 cm), a narrow film (advise cm) coverage, and a cotton live broadcast, were set up. The soil moisture was measured at a time interval of 5 days using a soil temperature and humidity recorder, and the precipitation weather was delayed. The emergence and damage of cotton dragons were observed.
August 24, 2021