Abstract
Vegetable waste causes resource waste and environmental pollution, giving rise to the spread of harmful organisms and causing disease in normal vegetable cultivation. Random distribution of vegetable waste can increase the risk of non-point agricultural pollution and explore the feasibility of its resource utilization. This study was designed to evaluate the effects of different doses of exogenous microbial agents on soil microbial communities after in situ composting of cucumber straw on plots with biodegradable mulch films. The cucumber straw and chicken manure were used as the base materials, and the next generation sequencing was used to analyze changes in the microbiome following composting. The results demonstrate that the addition of exogenous microbial agents had prolonged the high-temperature duration, reduced the total organic carbon (TOC) content, and accelerated the decline in the C/N ratio, ensuring compost maturity and effectively shortening the composting time. The predominant bacterial phyla of the four treatment groups were Proteobacteria and Firmicutes; while among fungal phyla, these treatments decreased the relative abundance of Ascomycota. The treatment of 300 t/ha microbial agents significantly increased the richness and diversity of both the bacterial and fungal communities. Redundancy analysis suggested that soil total nitrogen (TN) content had a significant effect on the bacterial community, while TN content, pH, and temperature influenced the fungal community in these samples. Collectively, the treatment of 300 t/ha exogenous microbial agents improved the quality of composting and promoted microbiome diversity.
Highlights
Crop straw contains many nutrients, including carbon, nitrogen, phosphorus, and potassium, which can be used to carry matter, energy, and nutrients, serving as a valuable biomass resource [1]
We evaluated the combination of cucumber straw and biodegradable mulch film that was crushed and returned directly to the field using a straw grinder, following which, it was plowed and treated with exogenous microbial agents designed to encourage high-temperature composting
The distribution characteristics of both the bacterial and fungal microbial communities described in this study suggest that there are distinct differences, at the phylum level, in samples treated with various doses of exogenous microbial agents
Summary
Crop straw contains many nutrients, including carbon, nitrogen, phosphorus, and potassium, which can be used to carry matter, energy, and nutrients, serving as a valuable biomass resource [1]. If large amounts of vegetable waste are piled at random, it will begin to rot and stink, breeding mosquitoes and flies [4] and spreading germs [5]. This mismanagement leads to resource wastage and increased environmental pollution [6]. Effective reapplication of this straw accelerates its own decomposition and increases the supply of appropriate nutrients to the soil and promotes crop growth, regulates soil temperature, preserves
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