切割长度对不同品种水稻秸秆青贮品质的影响OA

[Objective]To explore the effects of cutting length on the silage quality of rice straw from different varieties.[Methods]Fresh straw from five rice varieties(Xinxiang S/R8029 Xiang,Xinxiang S/8X001,Xinxiang S/7W1446,Xinxiang S/9WH401 and Xinxiang S/R382)was used as materials,and cut into three lengths of 1-2 cm,2-3 cm and 3-4 cm,respectively.After 60 days of sealed fermentation in vacuum bags,the microbial populations,nutritional components and fermentation characteristics were determined.Membership function analysis was used to comprehensively evaluate nutritional components and silage fermentation indexes.[Results]In terms of microbial content,different varieties,cutting length,and their interaction had significant effects on the number of lactic acid bacteria and aerobic bacteria(P<0.05).No mold and yeast was detected in all treatments.In the 1-2 cm treatments of Xinxiang S/9WH401 and Xinxiang S/R382,the number of lactic acid bacteria was significantly lower than that in the 3-4 cm treatments(P<0.05).In the 1-2 cm treatments of all varieties,the number of aerobic bacteria was significantly lower than that in other treatments(P<0.05).In terms of nutritional components,under the same cutting length,there was no significant difference in crude protein content between Xinxiang S/R382 and Xinxiang S/8X001(P>0.05),but both were higher than those of other varieties;there was no significant difference in soluble carbohydrate content of Xinxiang S/R382 among three cutting lengths(P>0.05),and the soluble carbohydrate contents of 1-2 cm and 2-3 cm were higher than those of other varieties.In terms of silage fermentation quality,the pH values of all varieties under the 1-2 cm treatment were significantly lower than those under the 3-4 cm treatment(P<0.05),and the pH value slightly increased with increasing cutting length.Except for Xinxiang S/9WH401,there were no significant differences(P>0.05)in propionic acid content among treatments for the other varieties.Butyric acid was detected only in Xinxiang S/9WH401,and its content significantly increased with increasing cutting length(P<0.05).The V-score values of Xinxiang S/R8029 Xiang,Xinxiang S/R382,Xinxiang S/8X001,and Xinxiang S/7W1446 under different cutting lengths were all above 90,with Xinxiang S/R382 showing the highest average ranking under different cutting lengths.[Conclusion]Xinxiang S/R382 is an ideal material for silage production,and the cutting length of 1-2 cm can effectively improve the silage quality of rice straw.