Study on Degradation Effect and Crop Productivity of Different Types of Mulching Film in Winter Potatoes in Guangdong Province
A comparative analysis was conducted on the differences in potato growth,yield,quality,and mulching film degradation performance between black inorganic degradable mulching film(T1),transparent polyethylene mulching film(T2),and black polyethylene mulching film(T3),using the early-maturing potato variety'Yueyin 85-38'as the experimental material and bare land cultivation as the control,in order to understand the degradation effect of mulching films and their influence on potato productivity in winter-planted potatoes in Guangdong Province.Mulching film treatments significantly promoted potato growth.Compared to the control,treatment T1 increased potato plant height by 6.95%,emergence rate by 6.76%,and leaf SPAD value by 8.54%.No differences were found for emergence rate and SPAD value between T1 and T3.In terms of yield,the order from high to low was T3(2 474 kg/667m2)>T2(2 441 kg/667m2)>T1(2 437 kg/667m2)>bare land cultivation(2 343 kg/667m2),but there was no significant difference among the three mulching films.In terms of marketable tuber percentage,T3(93.62%)>T1(88.67%)>T2(86.51%)>bare land cultivation(82.97%).Regarding tuber quality,compared with the bare land cultivation,T1 significantly increased protein content(64.30%),vitamin C content(37.39%),and soluble sugar content(79.18%).The black inorganic degradable mulching film had degraded by 36.05%at the potato maturity stage,which was significantly higher than that of transparent polyethylene mulching film and black polyethylene mulching film.The black inorganic degradable mulching film promotes potato growth,improves yield,enhances tuber quality,degrades quickly,and does not require recycling,making it suitable for promotion and application.
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