Polybutylene adipate terephthalic acid (PBAT) biodegradable mulching films effectively affect the nutrition metabolism and growth of chewing cane compared to polyethylene mulching films

Abstract

Plastic mulching films are vital materials in agriculture, contributing to the improvement of crop yield and quality but also causing environmental pollution. Using biodegradable mulching films (BM) can help mitigate this pollution. However, there is a lack of understanding regarding the impact of biodegradable mulching films on chewing cane growth compared to traditional polyethylene mulching films (PM). This study aims to compare the effects of biodegradable and non-biodegradable mulching films on chewing cane yield, soil enzymatic activities, root enzymatic activities, microbial abundance, and community diversity in rhizosphere soil. These experimental results showed that the tensile properties of BM gradually degraded over time. Both BM and PM significantly impacted the soil temperature, bulk density, and total porosity. The BM significantly affected the utilization of nitrate nitrogen, ammonium nitrogen, and organic matter by regulating the activities of urease, catalase, sucrose reductase, glutamine synthetase, and the gene expression of NIR2, GOGAT1, GOGAT2, GS1b, GS1c, NAR2, NRT2.1. Ascomycota (59 %86 %) was the dominant fungal phyla, and 383 fungal genera were detected in all samples, of which the main fungal genus was Chaetomium (4.95 %34.25 %). BM significantly increased the abundance of Rozellomycota and Geotrichum. BM increased the yield by 13.46 %, doubled the root weight, and improved the plant weight by 26.25 %. Our finding suggests that BM has a favorable regulation function in the utilization of nutrition and enriches some key factors that promote the growth of chewing cane. It advances understanding of the regulation mechanisms of biodegradable mulching films on the crops.