Obj ective The aim of this study was to enhance use efficiency of rice straw•[Method]In this paper,the suitability of rice straw was compared among six typical rice varieties in Sichuan and Guizhou•The straw was collected j ust after harvesting and cut into chip (2-5 cm )•Corn flower was added based on 50 g/kg (fresh weight)•The main nutrient components,such as TBN (ammoniacal nitrogen),WSC (water-soluble carbohydrate),CP (crude protein),NDF (neutral detergent fiber)and ADF (acid detergent fiber)were determined in both fresh straw and silage•The pH value and sensory characteristics were assessed after 40 days•[Results]Nutrition compo-nents of RS were different among genes and growing environments and the former was more im-portant than the latter,which suggested that breeding method may enhance usage value•There was no significant differences in ADF and NDF among six varieties within ZY-238,CXY-6 and GY series (P>0• 05)but they were significantly higher than those of Ⅱ-Y series (P<0• 05,P<0• 01)•The WSC and CP contents of Ⅱ-Y series were richer than those of other varieties•The WSC value of GY series was in the middle level and there were similar in a same series•The DM, WSC and CP values of Ⅱ-Y and GY series varied with planting area and variety (P<0• 05 )•[Conclusion]The unsuitable rice straw can ensilage by adding corn flower•WSC content was in-creased and pH and TBN were decreased•The straw was ensilaged with corn flower and LAB•The pH value was less than 4• 2 and TBN value was less than 0• 12%•WSC and CP were in-creased to 2• 5 g/kg and 6• 89 g/kg,respectively•However,ADF and NDF contents were also significantly decreased•As a whole,the ensilage suitability of Ⅱ-Y series and GY-257 RS was better and silage quality was improved significantly by adding corn flower and LAB.%【目的】提高稻草的利用效率。【方法】对贵州和四川栽培的6个水稻品种的适宜性进行了对比研究。水稻收割完后将秸秆样品切成约2～5 cm长，然后按鲜重比50 g/kg添加玉米粉，并对稻草鲜样和青贮饲料的主要营养成分（TBN、WSC、CP、NDF、ADF）进行测定，经过40 d的青贮然后对其 pH 值和感官特征分别进行测定和评估。【结果】稻草的营养成分受基因和生长环境的影响而发生变化，基因比生长环境对稻草的影响更大，说明育种方法能提高其使用价值。ZY-238、CXY-6和GY系列（P＞0•05）等6个品种之间的ADF和NDF含量没有明显的差异，但却显著高于Ⅱ-Y系列（P＜0•05，P＜0•01）中ADF和NDF的含量。Ⅱ-Y系列的 WSC和CP 含量比其他品种高，GY系列的 WSC含量处于中间水平，在同一系列中还有类似的特征。Ⅱ-Y系列和GY系列中的DM、WSC、CP含量随种植区域和品种的变化而变化。【结论】即使不是优质稻草，在人工添加玉米粉的条件下也能成功青贮，WSC 含量增加，p H 值和 TBN 含量减少。稻草鲜样青贮之后添加玉米粉和乳酸菌，p H 值降到4•2以下，TBN 含量小于0•12％，WSC和CP增加到2•5 g/kg和6•89 g/kg ，ADF和NDF含量明显降低。从整体上来说，Ⅱ-Y 系列和GY-257稻草青贮适宜性更好，青贮饲料在添加了玉米粉和乳酸菌之后质量显著提高。
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