秋季补播一年生豆科牧草对扁穗牛鞭草产量和质量的影响

本试验以光叶紫花苕、箭筈豌豆和豌豆为材料,秋季补播于扁穗牛鞭草草地上,通过对补播草种物候期的观察、草地产草量的测定和牧草化学成分的分析,研究其对扁穗牛鞭草牧草产量和质量的影响。结果表明,3个补播草种的出苗时间基本一致（6～7d）,成熟期相近,均在五月中旬;在整个试验过程中,补播处理的产草量均高于对照,补播箭筈豌豆对草地产草量提高最大;随着刈割次数的增加,牧草粗蛋白含量降低,中性洗涤纤维和酸性洗涤纤维含量增加,而光叶紫花苕和箭筈豌豆在提高牧草品质方面表现较好。综合分析,秋季在扁穗牛鞭草草地上补播光叶紫花苕、箭筈豌豆和豌豆后,全年干草产量分别为12.32、13.97、12.98t/hm2,与对照相比,分别提高了36.1%、54.4%、43.4%,并且补播一年生豆科牧草可明显提高春季牧草品质（P〈0.05）。

Effect of Overseeding Annual Legumes in Autumn on Yield and Quality of Whipgrass

The object of this experiment was to discuss the effect of the three annual legumes（Vicia villosa L.,Vicia sativa L.and Pisum sativum L.） on the yield and quality of whipgrass when they were overseeded into whipgrass sward in autumn by observing the growth states of these oversown annual legumes and measuring the yield and chemical components of forage.The results showed that the oversown legumes all germinated in 6-7 days and their autumn were in the middle of May.During the period of experiment,all these treatments of overseeding legumes had a higher yield of forage than that of the control and Vicia villosa L.had a good better ability to improve the yield.But with the increasing of harvest time,the crude protein concentration decreased and neutral detergent fiber（NDF） and acid detergent fiber（ADF） concentration increased,and Vicia villosa L.and Vicia sativa L.were both good at improving the quality of forage.To sum up,compared with the control,the treatment of overseeding annual legumes in autumn increased by 36.1%、54.4%、43.4% respectively and it was obviously to improve the forage quality in spring（P0.05）.