混播比例对苜蓿青贮品质的影响

目的]研究不同比例的无芒雀麦与紫花苜蓿混播对青贮效果的影响。方法]试验设5个处理，即紫花苜蓿单播、无芒雀麦单播、紫花苜蓿＋无芒雀麦以50％＋50％、60％＋40％和70％＋30％比例混播，分析各处理青贮材料的pH值、CP、NDF、ADF、乙酸、丁酸、乳酸和总酸的变化，研究无芒雀麦与紫花苜蓿不同比例混播对青贮品质的影响。结果]与单播苜蓿相比，混播可以显著降低青材料的pH值（P〈0．01）、NH3．N／TN值（P〈0．01）和丁酸含量（P〈0．01），有利于保存青贮物的营养成分。混播还可提高青贮产物中乙酸、乳酸和总酸的含量（P〈0．01），从而提高苜蓿青贮品质。结论]以混播处理A（苜蓿50％＋无芒雀麦50％）效果最好，pH值，NH3-N/TN的含量最低，乳酸含量和综合评分最高。

Effects of Different Mix-sowing Ratio on Alfalfa Silage Quality

Objective] The purpose was to study the effect of alfalfa and smooth bromegrass with different mix-sowing ratio on silage quality.Method] In the test 5 treatments of single-sowed alfalfa or smooth bromegrass,and their mix-sowing with different ratios of 50%+50%,60%+40% and 70%+30% were set up to analyze pH,CP,NDF,ADF,acetic acid,butyric acid,lactic acid and total acid of the silage in each treatment and study the effect of alfalfa and smooth bromegrass with different mix-sowing ratio on silage quality.Result] Compared with single-sowed alfalfa,the mix-sowing not only could decrease pH(P<0.01),NH3-N/TN value(P<0.01) and butyric acid content(P<0.01) and benefit to preserve the nutrition component,but also could increase the content of acetic acid,lactic acid,total acid of the silage product(P<0.01),thus increasing the alfalfa silage quality.Conclusion] The mix-sowing treatment A(50% alfalfa + 50% smooth bromegrass) could get best effect,with lowest pH value and NH3-N/TN content and highest lactic acid and comprehensive score.