施氮对不同品种紫花苜蓿根系特性和生产性能的影响

为探究紫花苜蓿生长初期根系特性与其生产性能的关系,以紫花苜蓿品种'甘农7号'甘农3号'、'LW6010'和'陇东'苜蓿为试验材料,设不施氮和施氮(103.5 kg·hm-2)2个处理,进行田间小区试验,对种植当年第1茬刈割的紫花苜蓿生产性能和根系特性及其相关性进行研究.结果表明:无论施氮与否,'LW6010'的株高、...

Effects of Nitrogen Application on Root Characteristics and Productivity of Different Alfalfa Cultivars

To explore the relationship between root characteristics and productivity of alfalfa in early growth stage,in this study,a field experiment was conducted with alfalfa‘Gannong NO.7’,‘Gannong NO.3’,‘LW6010’and‘Longdong’as experiment materials,and two treatments of no nitrogen application and nitrogen application(103.5 kg·hm^-2)were set to study the performance and root characteristics of the 1^st cut alfalfa cut in the planting year and their correlation.The results showed as follows:regardless of nitrogen application,plant height,yield,taproot length,root volume,root surface area,root nodule number per plant,nodule weight per plant,crude protein content and relative feeding value of‘LW6010’were the highest,and the plant height,yield,taproot length,root surface area,crude protein content and relative feeding value of‘LW6010’were significantly higher than those of‘Longdong’alfalfa(P<0.05).The agronomic traits and quality of all varieties were better than that without nitrogen application.According to the correlation analysis,the root characteristics of alfalfa were positively correlated with yield,The root length,root volume,root surface area and nodule weight were positively correlated,and the number of nodule was positively correlated.Therefore,improving the taproot length,root surface area,root volume and nodule characteristics in the early growth stage of alfalfa will improve its yield.