象草与玉米秸秆混合青贮效果的研究

为研究不同含水率条件下象草（Pennisetum purpureum）与玉米（Zea mays var.rugosa）秸秆混合青贮的效果，用含水率同为71.20%的象草与玉米秸秆调制了含水率为73.86%~73.10%的混合青贮（MC1青贮），用含水率分别为59.30%与59.10%的象草与玉米秸秆调制了含水率为62.30%~60.91%的混合青贮（MC2青贮），MC1和MC2青贮均设3种混合比例（象草与玉米秸秆质量比为80∶20、70∶30和60∶40）。每个处理重复3次，常温下贮存60 d，开封后评定青贮的品质。结果表明，所有青贮的品质优良；MC1和MC2青贮均随玉米秸秆比例的升高，乳酸含量极显著增加（P<0.01），pH值极显著降低，水分、乙酸、氨态氮、中性洗涤纤维和酸性洗涤纤维含量极显著或显著减少，干物质回收率极显著提高；MC2青贮的品质优于MC1青贮。

A study on efficiency of napier grass and maize straw mixed silages

In order to study the efficiency of mixed silages of napier grass(Pennisetum purpureum) and maize straw(Zea mays var.rugosa) with different moisture contents,the quality of mixed silages after 60 day fermentation in normal temperature was evaluated in which napier grass and maize straw with a same moisture content(71.20%) were brewed a mixed silage with 73.86%-73.10% moisture content(MC1 silage);and also napier grass with 59.30% and maize straw with 59.10% moisture content were brewed a mixed silage with 62.30%-60.91% moisture content(MC2 silage).Both MC1 and MC2 silages were mixed with 3 ratios at 80∶20,70∶30 and 60∶40 of napier grass to maize straw by weight.Every treatment had 3 replicates.The results showed that the qualities of all the mixed silages were excellent.For both MC1 and MC2 silages,as the ratio of maize straw increased,the lactic acid content and dry matter recovery rate significantly increased(P<0.01),while the pH value,the contents of moisture,acetic acid,ammonia-N,neutral and acid detergent fiber significantly decreased(P<0.01 or P<0.05).The quality of MC2 silage was better than that of MC1 silage.