摘要
以两种不同基因型的大豆品种为试材，研究不同阶段施用氮肥对大豆结瘤、生长及产量的影响。每公顷仅施２５ｋｇ的启动氮，两个大豆品种虽获得较高的根瘤干重，但仅靠其自身固氮功能，不能满足大豆生长及丰产的要求。在大豆开花期（Ｒ１）或种子形成始期（Ｒ５），每公顷再追施５０ｋｇ氮肥，两个大豆品种都获得了最高的干物质重和产量。在播种前或开花前期，施用过多的氮肥，严重抑制了两个大豆品种根瘤的生长，降低了其自身的生物固氮功能。
A field experiment which consist of two soybean genotypes was conducted to study the effects of N application at different stages on nodulation, growth and yield of soybeans. Although a starter N of 25 kg N/ha could cause to obtain high nodule dry weight yat nitrogen nutrient from the N fixation is insufficient for maximuming plant growth and yield. A N top dressing of 50 kg N/ha at flowering stage (R1) or seed formation stage (R5),could cause both varieties to obtain highest biomass and yield. Too high N application before flowering reduced both nodulation and N fixation significantly. Further too high N application before flowering stage had no significant effect on soybean yield comparing with the treatment of applying a starter N of 25 kg N/ha.
出处
《大豆科学》
CAS
CSCD
北大核心
1997年第2期125-130,共6页
Soybean Science
基金
国家人事部留学回国人员基金
湖北省农科院青年科学基金
关键词
大豆
氮肥
根瘤
生长固氮
产量
Soybean
Nitrogen
Nodule
Growth N fixation
Yield
