关键词: 水稻, 青贮, 适宜性

Abstract: [Objective] 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 just 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 components of RS were different among genes and growing environments and the former was more important 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 increased 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 increased 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.

Key words: rice, silage, suitability