Application and degradation optimization of biodegradable mulch in Phaseolus vulgaris Linn production

doi:10.16178/j.issn.0528-9017.20240825

Abstract

Abstract:

To evaluate the application effects of biodegradable mulches in Phaseolus vulgaris Linn production in lower-middle reaches of the Yangtze River，a split-plot experimental design was adopted. The main plots included four treatments：PBAT mulch，PLA mulch，PE mulch，and CK（no mulch），while the subplots included three different colors of mulch：black，white，and silver-black. Additionally，a plate culture experiment was used to assess the degradation efficiency of Pseudomonas mendocina and cutinases on the biodegradable mulches. The results showed that mulch coverage significantly（p<0.05）increased the yield of Phaseolus vulgaris Linn，the average yields of Phaseolus vulgaris Linn for PLA，PBAT，and PE mulches were 11 236，11 137，and 10 841 kg·hm^-2，respectively，while the yield for CK was only 8 954 kg·hm^-2. Moreover，under the same type conditions，the yield of Phaseolus vulgaris Linn covered with white mulch was significantly lower than that covered with black and silver-black mulches，and the weed biomass under white mulch was significantly higher than that under black and silver-black mulches. Throughout the entire growth period of Phaseolus vulgaris Linn，the final degradation grade of PBAT and PLA mulches was 5-6，with a residual rate of 53.0%-62.4%. Pseudomonas mendocina and cutinases enhanced the degradation of PBAT and PLA mulches，with soil exposure rates of 33%-46% for Pseudomonas mendocina and 25%-35% for cutinases. Overall，the yield-increasing effect of PBAT and PLA mulches on Phaseolus vulgaris Linn was consistent with that of PE mulches，and they have preliminarily achieved the degradation target，possessing the potential for application and promotion in Phaseolus vulgaris Linn production in the lower-middle reaches of the Yangtze River.

Key words: biodegradable mulch, Phaseolus vulgaris Linn, yield, degradation

CLC Number:

S643

HU Yuan, DENG Jinhua, WANG Jie, SHI Linlin, LU Changying, WANG Haihou. Application and degradation optimization of biodegradable mulch in Phaseolus vulgaris Linn production[J]. Journal of Zhejiang Agricultural Sciences, 2026, 67(4): 1018-1023.

Figures/Tables 5

Fig.1 Yield of Phaseolus vulgaris Linn covered with different mulches

Fig.2 Weed biomass（fresh weight）covered with different mulches

Table 1 Degradation grade of mulches

地膜类型	地膜颜色	4月25日	5月10日	5月25日	6月10日	6月25日	7月10日	7月25日
PBAT	白色	1	2	3	4	4	5	6
PBAT	黑色	1	1	2	3	4	4	5
PLA	白色	1	2	3	4	4	5	6
	银黑色	1	1	2	3	4	4	5
	黑色	1	1	2	3	4	4	5
PE	白色	0	0	0	1	1	1	1
PE	黑色	0	0	0	0	0	0	0

Fig.3 Residual rate of different mulches

Fig.4 Soil exposure rates of mulches treated with Pseudomonas mendocina and lipase

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