Effects of different degradable film and ordinary plastic film on soil hydrothermal conditions and peanut growth

【Objective】 Peanut is an important economic crop and the main planting method is plastic film mulching. It is necessary to study the effects of different degradable film mulching and ordinary plastic film mulching on the soil hydrothermal environment and growth of peanut. 【Method】 Field experiments were conducted at the Experimental Station, China Agricultural University, Rizhao City, Shandong Province, China in 2022 to investigate effects of degradable film and ordinary plastic film mulching on soil hydrothermal conditions and peanut growth and select the type of degradable film suitable for peanut planting. Five mulching treatments (white plastic mulching, WM; black plastic mulching, BM; white degradable mulching, WDM; black degradable mulching, BDM; and no film mulching, CK) were applied. 【Result】 ①The results indicated that degradable mulching had significant effects on soil hydrothermal condition, yield, and water use efficiency. The mean soil temperature at 0-25 cm depth during seedling stage in white degradable mulching treatment was 0.8 ℃ higher than that in white plastic mulching treatment, and that in black degradable mulching treatment was 0.6 ℃ higher than that in black plastic mulching treatment. The mean soil temperature at 5 cm depth at night during seedling stage in white degradable mulching treatment was 0.8 ℃ higher than that in white plastic mulching treatment, and that in black degradable mulching treatment was 0.6 ℃ higher than that in black plastic mulching treatment. The difference of accumulated effective temperature at night during seedling stage in white degradable mulching treatment was 88 ℃ higher than that in white plastic mulching treatment, and that in black degradable mulching treatment was 60 ℃ higher than that in black plastic mulching treatment. The soil water content during whole growth stage in white degradable mulching treatment was 11.7% higher than that in white plastic mulching treatment, and that in black degradable mulching treatment was 7.2% higher than that in black plastic mulching treatment. ②Compared with yield and water use efficiency in white plastic mulching, black plastic mulching and black degradable mulching treatment, the peanut yield in white degradable mulching treatment increased by 5.3%, 6.6% and 17.3%, respectively, and the water use efficiency in white degradable mulching treatment increased by 7.8%, 11.7% and 22.8%, respectively. ③The degradation rate of white degradable film was 14.6% higher than that of black degradable film. 【Conclusion】 The degradable film has similar warming and moisture conservation effects with ordinary plastic film in the hydrothermal environment in peanut planting; the peanut yield and the degradation rate of film in white biodegradable film treatment was higher. So white biodegradable film is the most suitable alternative in Shandong peanut planting.