喷施脱叶剂对紫花苜蓿种子活力和产量的影响

Effect of defoliant application on seedyield and quality of alfalfa

摘要:

在甘肃庆阳市农业科学研究院和盛科研基地研究不同浓度的脱叶剂对苜蓿成熟期脱叶率、茎叶相对失水率、种子产量和质量的影响。结果表明:紫花苜蓿种子收获前期施用不同浓度的脱叶剂能明显提高苜蓿的脱叶率和茎叶相对失水率,显著缩短苜蓿的干燥时间;脱叶效果最佳的施用浓度是0.40%和0.55%,两年平均脱叶率分别达到34.26%和34.64%,其相对失水率也最高。施用脱叶剂对当年苜蓿种子的产量影响不大,但降低了第2年的枝条数。脱叶剂施用浓度过大影响种子萌发,导致不正常种苗比率增加。

Abstract:

A field experiment was carried out in Agricultural Sciences Base of Qingyang Academy,Gansu Province to evaluate the effects of defoliant (paraquat) application on defoliation rate,stem and leaf rate of water loss,seed yield,seed yield components and seed vigor of alfalfa.The results showed that the different concentrations of defoliant significantly increased the stem and leaf relative water loss rate,and significantly shorten the drying time of alfalfa;0.40% to 0.55% of defoliant concentration were the best,and the defoliation rate reached 34.26% and 34.64% respectively.The defoliant did not affect the alfalfa yield in first year,but the shoot density was decreased in second year.The abnormal seedlings increased with the increasing of defoliant concentration.