Effect of Composite Microbial Strains on Pig Manure and Rape Straw Compost
In order to screen out the compound bacteria suitable for the degradation of rape straw and the production of straw organic fertilizer in Qinghai province,two strains of Bacillus hatolerans and one strain of Brevibacterium frigoritolerans were used in the composting process.The compost test was to screen out the optimal compound bacteria strains through determining the compost temperature,conduc-tivity,seed germination rate,total nitrogen,total phosphorus,total patassium,organic matter,cellulose,hemicellulose degradation.The results showed that the high temperature period of ABC treatment(Bacil-lus hatolerans H36-7-4:Bacillus hatolerans K1:Brevibacterium frigoritolerans AH-5-1=1∶1∶1)was 1 day longer than that of CK treatment(without agent)in the thermophilic phase,and it entered the cooling period 11 days earlier.Moreover,the maximum compost temperature of ABC treatment was 1.4 ℃ higher than that of the control group.Likewise,the pH and electrical conductivity(EC)values of ABC treatment were 8.04 and 1.32 mS/cm,respectively,which were 0.14 and 0.8 mS/cm lower than those of the control group.The seed germination index of the composite microbial system ABC treatment group reached the maturity standard of composting at day 16 and was significantly higher(129.47％)than the control treat-ment group(88.53％)(P＜0.05)at the end of the composting process.The organic matter degradation rate of the BC treatment(41.59％)and the ABC treatment group(40.28％)was significantly higher than that of the other treatment groups(P＜0.05).The total nitrogen,total phosphorus,and total potassium contents of the ABC treatment were 2.06％,3.19％,and 1.63％,respectively.At the end of the compos-ting process,the cellulose degradation rate of the ABC treatment group with the addition of three strains was 14.45％,and the hemicellulose degradation rate was 39.28％,significantly higher than that of the oth-er treatments(P＜0.05).Therefore,adding compound agent ABC is suitable for rape straw composting in Qinghai area.
万方数据
维普
