【作者】 吴长付； 刘立军； 王志琴； 杨建昌；

【机构】 扬州大学江苏省作物遗传生理重点实验室；

【摘要】 本试验以常规粳稻扬粳9538为材料,设置了七种不同的氮肥处理,研究了不同氮肥管理对水稻产量和冠层内生态环境的影响。结果表明：N2(实地氮肥管理)和 N5处理的产量与 FFP(农民习惯施肥法)无显著差异,但施氮总量均较 FFP 处理明显降低。与 FFP 处理相比,N2和 N5处理的茎蘖成穗率较高,高效叶面积比例高、株高适宜,有利于形成高产群体。不同氮肥管理对群体冠层内的昼夜温度差和湿度差以及透光率等生态条件有明显影响。上述生态条件与纹枯病的发生状况密切相关。合理的氮肥管理有助于改善群体结构,降低纹枯病等病害的发生,从而有利于水稻优质高产。更多还原

【Abstract】 Using conventional Japonica rice Yangjing9538 as a material,effects of seven N managements on grain yield and ecological environment in canopy in rice were investigated.The results showed that there were no significant difference in grain yields of treatments of N2 (site-specific nitrogen management) and N5,but their total N rates were decreased significantly, when compared with farmers’ fertilizer practice (FFP).Productive tiller rate and high efficient leaf area ratio were higher and plant height was suitable in N2 and N5,which were beneficial to establish high-yielding rice population.N managements had significant effects on ecological environments such as temperature and relative humidity during day and night and light transmission rate in rice canopy.Such ecological environments were closely related to the sheath blight occurrence in rice.Rational nitrogen management was helpful to improve population structure,reduce the occurrence of sheath blight,and attain high yield and good quality in rice finally.更多还原