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大豆科学  2015 

种植模式和施氮水平对大豆花荚脱落及产量的影响

DOI: 10.11861/j.issn.1000-9841.2015.05.0843, PP. 843-849

Keywords: 玉米-大豆套作,农艺性状,产量,脱落

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Abstract:

通过田间裂区试验,研究了两种种植模式(大豆单作、玉米-大豆套作)和玉米、大豆施氮总量(NN:0;RN:180kg.hm-2;CN:240Nkg.hm-2)对大豆农艺性状、花荚脱落及大豆产量的影响。结果表明:与大豆单作相比,玉米-大豆套作模式使大豆R2期的株高、茎粗、有效分枝数和倒三叶面积降低,第一节间长和平均节间长升高,大豆全株及中上层的落花数、落荚数和花荚脱落率显著降低,单株荚数、经济系数显著提高。玉米-大豆套作系统中,RN处理下的有效分枝数较少,倒三叶面积显著降低,大豆全株及中上层落花数显著减少,花荚脱落率达到最小值,比NN和CN显著降低10.8%、10.2%;在RN处理下,玉米-大豆套作模式下的大豆单株荚数、百粒重和生物量最大,产量和经济系数表现最佳。

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