不同时期供氮水平对神豆2号的影响

Influences of Supplying Nitrogen in Different Stages on Shendou 2

探索不同时期追氮对大豆生长发育及产量的影响。采用随机区组设计研究了3个不同时期追施纯氮51.75 kg/hm2对神豆2号的生物性状和产量构成因素的影响。6片复叶期追氮使株高、单株荚数、单株粒数增加,抗倒伏能力增强,秕荚数减少,比对照增产显著,达19.3%;盛花期前10 d追氮使株高、单株荚数、单株粒数降低,秕荚数增多,百粒重增加,增产显著,达12.1%;结荚初期追氮使株高、结荚高度降低,主茎有效分枝数增加,百粒重降低,减产15.7%;3个时期追氮对大豆外观品质没有规律影响。不同时期追氮对神豆2号的营养生长和生殖生长都有一定的影响。6片复叶期、盛花期前10 d追氮都可增加产量,且达显著水平。

The study aimed to explore the influences of topdressing nitrogen（N） in different stages on the growth and development and yield of soybean In the field test with random block design,the influences of topdressing pure N at 51.75 kg/hm2 in 3 different stages on the biological characters and yield component factors of Shendou 2 were studied.Topdressing N in 6-leaf stage of soybean made plant height,pods number per plant and grains number per plant increased,lodge-resistance capacity strengthened and abortive pods number decreased,which the yield was 19.3% significantly higher than that of CK.Topdressing N in the time of 10 d before florescence made plant height,pods number per plant and grains number per plant decreased,abortive pods number and 100-seed weight increased,which the yield was 12.1% significantly higher than that of CK.Topdressing N in initial pod-setting stage made plant height and pod-setting height decreased,available branches number of main stem increased,and 100-seed weight reduced,which the yield was 15.7% lower than that of CK.The influences of topdressing N in 3 stages on the appearance quality of soybean had no any law.Topdressing N in different stages had some influences on the vegetative and reproductive growth of Shendou 2.Topdressing N in 6-leaf stage and in the time of 10 d before florescence could increase yield,which effect reached significant level.