Application Effect Of Three Kinds Of Microbial Agent In High-temperature Composting Of Rabbit Manure

In this study, microbial agent, mushroom residue, bran powder and rabbit manure were used as the auxiliary organic materials in the high-temperature composting. Six trial groups and two control groups were set up respectively which were called bran powder-rabbit manure group (bran powder-rabbit manure-microbial agent A, bran powder-rabbit manure-microbial agent B and bran powder-rabbit manure-microbial agent C), mushroom residue-rabbit manure group (mushroom residue-rabbit manure-microbial agent A, mushroom residue-rabbit manure-microbial agent B and mushroom residue-rabbit manure-microbial agent C) and two control groups (bran powder-rabbit manure and mushroom residue-rabbit manure)Physical and chemical parameters in the high-temperature composting affected by bran powder, mushroom residue and microbial agents (microbial agent A, microbial agent B and microbial agent C) through high temperature aerobic composting experiment, such as temperature, moisture content, pH, TOC, TN, TP, TK, cuprum and zinc were detected during compositing process for 40 days. The procedures of correlation analysis in the statistical software of SAS were applied to analyze the impact on TOC, TN and C/N made by microbial agents during the rabbit manure composting in order to improve the utilization efficiency of rabbit manure resources, reduce the compost time, enhance the utilization efficiency of organic fertilizer and provide theoretical basis for rabbit manure composting treatment on large rabbit farms. The results were listed as follows:(1) Trial group and control group both arrived at the normal fermentation temperature in compositing process and high temperature period (≥50P<0) last for more than 15 days, which met to sanitary standard for the Non-hazardous Treatment of Manure by killing pathogenic bacterium, ova of roundworm and weed seeds effectively. The high temperature period of bran powder-rabbit manure control group was longer than that of mushroom residue-rabbit manure control group for 5 days. The temperature of all compost piles 15 se to more than 55℃ in two days. The influence on reducing (?) time by adding microbial agents was not distinct becausee of the short heating up time. Therefore, adding extra microbial agents could rake the temperature of high ternperature peridd of compost piles, prolong the lasting time of high temperature period and enhance the quality of compost except reduce the composting time. Whereby, microbial agent B worked best in raising the temperature of compost pile and extending the time of high temperature period.(2) The moisture content of all compost piles continued to decline. At the end of composting, the moisture content of all compost piles was less than 30% and pH of all compost piles was about 8.2～8.6, which showed the composting product had met to the normal standard (pH8.0～9.0) for compost maturity.(3) Bran powder could improve TOC and C/N of compost piles obviously which was higher than that of mushroom residue (P< 0.05) during all the composting process. Otherwise, mushroom residue could decrease TOC of compost piles. After composting, C/N ration of all compost piles was higher than the normal standard for compost maturity of 20:1, which didn’t appear to be much different from initial value. The probable causes were:lignin and hemicellulose in compost piles could not be used by microorganism effectively and the. continuous declination of mass of compost piles lead to the raising of TOC. Microbial agents had little influence on TOC. TN of each compost piles decreased at first and increased later. During the heating up period, microbial agents could reduce TN of compost piles significantly (P< 0.05)(4) Organic matter in each group showed up trend in the composting process and the end of compost organic matter were more than 45%. However, C/N was at a high level and the level of compost maturity was not high enough. The mass fraction of total nutrient was on a low side which required secondary compost so as to increase it.(5) In the composting process, the relative amount of TP and TK kept raising Math the mass and bulk of compost piles reducing.(6) The content of Zn and Cu of compost piles could be reduced by mushroom residue, bran powder and rabbit manure composing. Furthermore, the more proportion auxiliary material held, the lower content of Zn and Cu had in compost piles.