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大豆科学  2015 

氮密交互对大豆干物质在冠层中分布的影响

DOI: 10.11861/j.issn.1000-9841.2015.01.0046, PP. 46-51

Keywords: 大豆,氮密交互,冠层,干物质积累

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Abstract:

以东农52大豆为试材,采用裂区设计,设置3个密度(20万,25万,30万株?hm-2)和3种施氮方式(基肥施N60kg?hm-2;基肥施N18kg?hm-2+R3/R4追N42kg?hm-2),研究氮密交互对R4期后大豆叶片、叶柄和荚果干物重在冠层中分布以及不同粒数荚在冠层中分布的影响。结果表明:R6期前,中冠层各器官干重随密度的升高而升高,而到R7期,25万株?hm-2处理上、中冠层各器官干物重显著高于30万株?hm-2的处理,从R5期开始,启动氮加追氮处理上、中冠层各器官干重显著高于氮肥一次性施用,且R4期追氮优于R3期追氮;R8期,25万株?hm-2密度的上冠层荚果干重R4期追氮处理较氮作基肥一次性施用高15.2%(P<0.05)。上、中冠层≤2粒荚数在密度为30万株?hm-2时最高;而3、4粒荚数在密度为25万株?hm-2时达最大值;启动氮+R4期追氮显著提高了上、中冠层3、4粒荚数。综上得出,25万株?hm-2密度下启动氮+R4期追氮处理能显著提高R6期后上、中冠层各器官干重以及3、4粒荚数,产量较其他处理增加10.8%~36.5%(P<0.05)。

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