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[目的]筛选出既能加快苜蓿植株干燥又不降低苜蓿种子产量和质量的合适干燥剂。[方法]在甘肃酒泉地区研究不同干燥剂对紫花苜蓿成熟期脱叶率、茎叶相对失水率、种子产量和质量性状的影响。[结果]不同浓度的百草枯均增加了紫花苜蓿茎叶相对失水率,茎叶相对失水率均超过50%,明显加快了紫花苜蓿植株的干燥时间,百草枯处理没有降低紫花苜蓿种子产量和千粒重,在合适的浓度范围内对种子发芽率也没有影响;K2CO3显著地增加了脱叶率5,%K2CO3茎叶相对失水率达到16.58%,而对种子产量和质量没有负面影响;Na2SO4提高了种子产量,但干燥效果较K2CO3差;CaCl2的作用与K2CO3作用类似,但总体干燥效果不及K2CO3。[结论]结果为干燥剂在紫花苜蓿生产中的应用提供了理论支持。
[Objective] The research aimed to screen suitable desiccant which can accelerate the dryness of alfalfa plants without reducing the yield and quality of alfalfa seeds. [Method] The effects of different desiccant on the defoliation rate, relative water loss rate of stem and leaf, seed yield and quality traits of alfalfa were studied in Jiuquan area of Gansu province. [Result] Different concentrations of paraquat increased the relative water loss rate of alfalfa stems and leaves, the relative water loss rate of stems and leaves more than 50%, significantly accelerated the drying time of alfalfa plants, and the paraquat treatment did not reduce the seed yield of alfalfa And 1000-grain weight had no effect on the seed germination rate in the proper concentration range. K2CO3 significantly increased the rate of defoliation 5, and the relative water loss rate of stem and leaf of% K2CO3 reached 16.58%, but had no negative effect on the seed yield and quality. Na2SO4 Improve the seed yield, but the drying effect is worse than K2CO3; the role of CaCl2 is similar to that of K2CO3, but the overall drying effect is less than K2CO3. [Conclusion] The results provided theoretical support for the application of desiccant in alfalfa production.