摘要
为明确油-稻-稻三熟制油菜秸秆还田条件下早稻的适宜施氮量,2017-2018年以超级常规早稻中嘉早17为材料,设置0、75、120、165、210kg/hm^2等5个施氮量,探究油菜秸秆还田条件下施氮量对早稻产量形成及氮素吸收利用的影响。结果表明:在油菜秸秆还田条件下,适宜施氮量有利于早稻分蘖成穗,灌浆期维持较高的叶面积指数、光合势和干物质积累量,同步增加单位面积有效穗数和保持较多的每穗粒数,从而扩大总库容量。在施氮量为165kg/hm^2时早稻即可达到较高产量,同时维持较高的氮肥吸收利用率。采用线性加平台模型拟合得出最佳施氮量,2017和2018两年分别为155.91、160.37kg/hm^2,产量潜力分别达8 241.17和8 387.32kg/hm^2。
To explore the effects of nitrogen application rate on yield formation and nitrogen use efficiency of early rice under rape straw returning to the field in rape-rice-rice cropping system,the conventional super early rice Zhongjiazao 17 was used and five nitrogen fertilizers such as 0,75,120,165,210 kg/hm^2 were set up in 2017-2018.The results showed:under rape straw returning to the field,optimal nitrogen application rate is conducive to early rice tillering and effective panicle,maintaining a higher LAI,photosynthetic potential and amount of dry matter production during the grouting period,and simultaneously increasing the number of effective spikes per unit area,maintaining a higher number of grains per panicle,thus expanding the population storage capacity.Results also showed that the yield of crops and nitrogen absorption would reach to a high point when the rate of fertilizer was 165 kg/hm^2.The optimal nitrogen application rate was 155.91 and 160.37 kg/hm^2 in 2017 and 2018,respectively,with the yield potential reached8 241.17 and 8 387.32 kg/hm^2 according to the model of linear plus plateau.
作者
肖小军
吕伟生
余跑兰
郑伟
李亚贞
胡磊
肖富良
张绍文
黄天宝
肖国滨
Xiao Xiaojun;LüWeisheng;Yu Paolan;Zheng Wei;Li Yazhen;Hu Lei;Xiao Fuliang;Zhang Shaowen;Huang Tianbao;Xiao Guobin(Jiangxi Institute of Red Soil/Jiangxi Key Laboratory of Red Soil Arable Land Conservation/National Engineering and Technology Research Center for Red Soil Improvement/Scientific Observational and Experimental Station of Arable Land Conservation in Jiangxi,Ministry of Agriculture and Rural Affairs,Nanchang 331717,Jiangxi,China;Meteorological Bureau of Nanchang County,Nanchang 330200,Jiangxi,China)
出处
《作物杂志》
CAS
北大核心
2019年第2期103-109,共7页
Crops
基金
江西省重点研发计划专项(20161BBF60111
20171BBF-60032
20151BBF60084)
公益性行业科研专项(201503123)
国家油菜产业技术体系(CARS-12)
江西省油菜产业技术体系栽培岗位(JXARS-08)
关键词
秸秆还田
施氮量
早稻
产量形成
氮肥利用率
Straw returning
Nitrogen application rate
Early rice
Yield formation
Nitrogen use efficiency
