Effects of Tea-Pruned Mulches and Microbial Products on the Accumulation of Organic Matter and Micro Biota in Soils Grown Tea in Phu Ho, Phu Tho Province, Vietnam

Tea-pruned mulches is as considered effective measures to improve soil moisture and also contribute to the nutrient cycle to ensure the ecological balance and increasing the efficiency of tea production in the North mountainous region of Vietnam. However, due to tea-pruned residues contains many persistent substances, e.g., tannin, lignin, cellulose and hemicelluloses, adding microbial products to accelerate the decomposition of crop residues are expected methods to supply more humus substance to soils. To appreciate the role of tea-pruned mulches to soil improvement, field experiments have been done on soils growing tea in Phu Ho, Phu Tho province. The main purpose of the research is to evaluate the influences of tea-pruned mulches and addition of microbial products to properties, organic matter accumulation and micro biota in soils. The results show the use of tea-pruned mulches have significant to improve soil moisture, reduce soil bulk density and increase the contents of organic matter in soils. Microbial products also change dramatically the composition and performance of micro biota to decompose organic matter in soils. When the tea-pruned mulches with addition of microbial products that accelerate the rate of organic matter decomposition and improve soil humus substances. However, the addition of microbial products has also increased mineralization processes. Consequently, the soil organic matter rapidly decline in a short time. Which uses EM, cellulose decomposition bacteria and Compost Maker have stronger effects than EMUNIV on organic decomposition process.