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linear regression Abstract. In order to boost the use value of biogas residue, main factors in dry fermentation were chosen to design an experiment to observe nutrient changes under different conditions before and after dry fermentation. The effects of manure-crop ratio, inoculum size, dry matter concentration and fermentation temperature on main nutrients before and after anaerobic fermentation were studied in this paper. Multivariant linear analysis of two comprehensive indicators shows that pretreatment has a significant effect on the increase in the content of rapidly available phosphorus and rapidly available potassium; manure-crop ratio shows a significant effect on the rise of organic content; the influence of other factors is not significant

Analysis about Influence of Dry Anaerobic Fermentation on Main Nutrients of Biogas Residue