Screening of Starter Cultures for Organic Fertilizer on Cow Manure

There were five strain′s combination(B1,B2,B3,B4,and B5)with a commercially available starter culture for cow manure fermentation to organic fertilizer,monitoring temperature,water contain,and pH of changes in fermentation trails,respectively.It was checked for the live microorganism quantities,water contain,and pH value for determination the quality of fermentation agents,and by determination on organic matter,total nitrogen,phosphorus,and potassium for determination the quality of organic fertilizer.The germination,growth detection with rapeseeds,was also checked on new organic fertilizer.The results showed that the fermentation agent B5 was best in all of trail combinations,with fermentation temperature went up fast,on the second day over 50 ℃,and fermentation in 20 days the water contain fell to below 50%,and pH fell to 6.5 in fermentation of the15th day.After fermentation,the organic fertilizer on rapeseed of germination and the growth was the greatest one,with germination 100%,average bud long 7.79 mm,root long 29.95 mm.It contained total living microorganism 2.61 ×1010cfu/g,pH was 7.0,and water contain was 13.25%,meeting national standard GB 20287-2006(living microorganism≥2.00×109cfu/g,pH was 5.5~8.5,water contain≤20%).After fermentation the cow dung,It contained organic matter was 82.17%,and N,P,and K was 7.10%,pH was 6.5.The organic fertilizer met the industry standard NY525-2012(organic matter ≥45%,N,P,K≥5%,pH 5.5~8.5).The fermentation of fresh cow manure to be completed within 20 days,in line with the requirements of most organic fertilizer producers′.