摘要
在小麦超高产栽培条件下,研究了氮肥不同追施时期、追施量对籽粒产量及植株生理特性的影响。结果表明,超高产小麦施氮量以240kg/hm^2,基追比例5∶5为宜,追氮量过少或过多均不利于进一步提高小麦产量。氮肥不同追施时期对小麦产量也有不同的影响,小花雌雄蕊分化期(N_3)和药隔形成期(N_5)追肥可明显改善植株后期光合性能,降低叶片气孔阻力,并使植株体内保持高水平的保护酶活性,降低后期细胞膜脂过氧化水产,延缓植株衰老,从而促进籽粒的形成与发育,显著提高了籽粒产量。
Effects of different nitrogen application on yield and plant physiological charac
teristics of winter wheat were studied under the super-high-yielding conditions. The results indi
cated that the application rate, 240 kg/ha, with base fertilization 50% and application 50% at
jointing stage, was suitable for getting super-high grain yield. Too much or too little application
of nitrogen might be unsuitable for making further improvement on wheat yield. Different effects
on wheat yield and plant physiological characteristics were also obtained among different nitrogen
application stages. Nitrogen application at stages of pistil-stamen formation and tetrad formation
markedly increased photosynthetic ability and activities of SOD and POD of plant leaves, and also
decreased stomatal resistance and membrane peroxidation level in later period of plant senescence,
thus promoted grain filling and increased grain yield significantly.
出处
《作物学报》
CAS
CSCD
北大核心
1998年第6期978-983,共6页
Acta Agronomica Sinica
关键词
小麦
氮肥后移
籽粒产量
生理特性
Super-high-yielding wheat
Application of nitrogen at the later stage: Grain yield
Physiological characteristics
