洞庭湖区5个紫花苜蓿品种高温期刈割后的表现

Effect of cutting under high temperature on regrowth and quality of five alfalfa cultivars

为探讨洞庭湖区紫花苜蓿(Medicago sativa)在夏季高温刈割后的生长状态及再生产量及品质的品种间差异,对种植一年的5个紫花苜蓿品种于2015年8月1日进行全年第5茬刈割测产,9月21日进行第6茬刈割测产。研究结果发现,秋眠级较高的苜蓿品种WL656、WL903第5茬刈割后再生植株长势和第5茬刈割鲜草产量显著优于秋眠级低的苜蓿品种WL363(P<0.05)。第6茬刈割WL903的鲜草产量显著高于其它品种,粗蛋白、中性洗涤纤维和酸性洗涤纤维含量在品种间存在显著差异,但没有明显变化规律。高秋眠级的WL903和WL712综合表现较好,是可进一步研究的耐热型苜蓿品种。

To study the regrowth of alfalfa under high temperature and the effect of different cultivars on yield and quality of regrowth, five alfalfa cultivarsin the Dongting Lake Area were harvested under high temperature; yield wasmeasuredon August 1st,which is the fifth cutting of the plant＇s first year. The sixth cutting was on September 21st. The results showed that plant regrowth and fresh grass yield of WL656 and WL903 （high fall dormancy grade） were better than that of WL363 （low fall dormancy grade） on the fifth cutting（P〈0.05）. The fresh grass yield of WL903 was significantly higher than that of other cultivars on the sixth cutting. The proportionsof crude protein, neutral detergent fiberandacid detergent fiber were significantly different among cultivars, but the contents themselves did not apparently change among cultivars. The comprehensive performance of WL903 and WL712 （both high fall dormancy grades） was better than the others. Cultivars WL903 and WL712 were candidate cultivars with heat resistance that warrants further study.