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采用盆栽试验,利用根系扫描分析系统研究了不同氮素用量(0、100、200、300 mg.kg-1)下菜用大豆生殖生长期根系形态动态变化特征,并比较了单株鲜荚产量差异。结果表明:不同氮素用量下生殖生长期菜用大豆根系形态指标均呈单峰曲线变化,峰值出现在开花后21 d;100 mg.kg-1氮素用量能明显促进菜用大豆根系发育和根瘤干物质的积累,促使大豆形成较大的根系表面积,较高的单株产量以及2粒荚和3粒荚数;当氮素施用量增加到200和300mg.kg-1时,根系干物质、根系表面积、根长和单株鲜荚产量均降低;300 mg.kg-1氮素施用量的根体积最大;不施氮处理的根瘤数目和重量最高,形成较多的细根,表现为根系长度最长,根系干物质重最低。
A pot experiment was conducted to study the dynamic changes of root morphology during the reproductive stage of vegetable soybean under different nitrogen levels (0, 100, 200, and 300 mg.kg-1) by root scanning analysis system. The yield per plant difference. The results showed that the root morphology of vegetable soybean showed a single peak curve under reproductive growth stage and the peak appeared at 21 d after flowering. The nitrogen application at 100 mg.kg-1 significantly promoted the development of vegetable soybean root system, The accumulation of nodule dry matter led to the formation of larger root surface area, higher single plant yield and two pods and three pods. When the N application increased to 200 and 300 mg.kg-1, the root dry matter , Root surface area, root length and fresh pods per plant all decreased. The root volume of 300 mg.kg-1 nitrogen application was the largest. The number and weight of the nodules without nitrogen application were the highest, The longest root length, root dry matter weight the lowest.