苜草净不同施用时期对雨养苜蓿生产性能的影响

Effects of Mucaojing application time on alfalfa(Medicago sativa)production

为了解苜草净(咪唑乙烟酸5%)施用时期对雨养苜蓿生产性能的影响,以山东省半岛地区的紫花苜蓿为研究对象,研究了4个苜草净施用时期对紫花苜蓿的株高、生物量、粗蛋白、酸性洗涤纤维(ADF)、中性洗涤纤维(NDF)的含量以及多种营养价值指数的变化趋势。结果表明,苜草净的施用在一定程度上造成了紫花苜蓿株高的降低,但在出苗期和幼苗期其抑制作用较弱;在出苗期施用苜草净显著提高紫花苜蓿生物量(P<0.05);苜草净对紫花苜蓿的叶茎比没有显著影响;紫花苜蓿的粗蛋白含量与施用苜草净时期的时间顺序呈负相关的趋势,而出苗期施用苜草净的紫花苜蓿粗蛋白产量显著高于播前施用苜草净的紫花苜蓿粗蛋白产量(P<0.05);施用苜草净的紫花苜蓿NDF和ADF含量均显著低于对照处理(P<0.05),营养价值指数均高于对照处理(P<0.05)。在雨养苜蓿区,出苗期施用苜草净有利于紫花苜蓿生物量、粗蛋白产量以及饲用价值的稳定和提高。

This research investigated the effect of Mucaojing （imazethapyr tivity of alfalfa on the Shandong peninsula. Plant height, biomass, crude 5% ap protem fiber （ADF） and neutral detergent fiber （NDF） were assessed after application plication time on the pro （CP） content, acid deter f Mucaojingat 4 stages. ducgent The results showed that Mucaojing application reduced plant height slightly when applied at emergence and seeding stages; biomass significantly increased （P〈0.05） when Mucaojing was applied at seeding. Mucaojing did not affect leaf-stem ratio. CP was negatively correlated with application time; when applied at emergence CP content was significant higher （P〈0.05） than treatment at the pre-sowing stage. NDF and ADF were significantly reduced （P〈0.05）, by Mucaojing application. In conclusion, the application of Mucaojing at the emergence stage increased alfalfa biomass and CP content under rain-fed conditions.