Key;
Laboratory;
of;
Arable;
Land;
Conservation;
(Middle;
and;
Lower;
Reaches;
of;
Yangtze;
River);
Ministry;
of;
Agriculture/College;
ofResources;
and;
Environment;
Huazhong;
Agricultural;
University;
Wuhan;
430070;
P.R.;
China;
营养缺乏; 人口发展; 产量形成; 营养吸收; 冬油菜; 播种; 干物质生产; 植物生长;