作物研究2017，Vol.31Issue(5)：494-497,4.DOI:10.16848/j.cnki.issn.1001-5280.2017.05.09
甘蓝型早熟油菜直播高产栽培的适宜施氮量和密度研究
Effects of Nitrogen Applied Rates and Plant Density on Yield and Nitrogen Fertilizer Use Efficiency of Direct-sowing Early-mature Rapeseed
摘要
Abstract
In order to study the suitable nitrogen fertilizer application rates and plant density for high yield of early-mature rapeseed (Brassica napus L.) under direct-sowing conditions in rice-rapeseed rotation system,field experiment with high quality and early-mature variety'Chongrongyou 1'was conducted in Chengdu Plain with four nitrogen (N) fertilizer rates (0,135,180,225 kg/hm2) and three planting densities (30 × 104/hm2 、60 × 104/hm2).The results indicated that plant height,primary branches number and length of main inflorescence were increased significantly as the increasing of N fertilizer applied rates,but the plant height and primary branches number were decreased.There were increase tendency of seed yield(2766.5 ～ 3186.5 kg/hm2)and nitrogen fertilizer contribution rate (NRC,45.0％ ～ 52.4％) to yield as the increasing of N fertilizer rates.However,agronomic N fertilizer use efficiency (ANUE,9.3 ～ 7.4 kg/kg) and partial factor productivity of applied N fertilizer (PFPN,20.5 ～ 14.2 kg/kg) were decreased as the increasing of N fertilizer applied rates.There was no significant difference in seed yield between different plant densities.The difference in oil content (％) was also not significant among the N fertilizer rates (135 ～ 225 kg/hm2).A lodging tendency of early-mature rapeseed was occurred at at 60 treatment in the field.Therefore,the N fertilizer application rate at 180 kg/hrn2 and suitable plant density at 30 × 104 plant/hm2 would be the favorable for higher yield,higher nitrogen fertilizer use efficiency of early-mature rapeseed under the condition of direct-sown in rice-rapeseed rotation system of Chengdu plain.关键词
早熟油菜/施氮量/种植密度/产量/氮肥利用率Key words
early-mature rapeseed (Brassica napus L.)/nitrogen applied rate/plant density/yield/nitrogen fertilizer use efficiency分类
农业科技引用本文复制引用
刘士山,张余红,刘前禄,廖方全,杨云飞,吴永成..甘蓝型早熟油菜直播高产栽培的适宜施氮量和密度研究[J].作物研究,2017,31(5):494-497,4.基金项目
四川省科技厅农作物育种攻关栽培课题(2016NYZ0051) （2016NYZ0051）
四川省农业厅油菜创新团队项目 （）
四川省人社厅学术带头人后备人选基金. （）
