摘要
试验于 1999～ 2 0 0 0年在中德合作项目北京试验基地进行。优化水氮系统全生育期喷灌 7次共 318mm ,追肥 2次共 60kg/hm2 (纯氮 ) ;传统水氮系统全生育期畦灌 4次共 32 9mm ,基追肥各 1次共 30 0kg/hm2 。试验结果表明 ,优化水氮系统较传统水氮系统小麦根系大 ,开花期综合根系年龄 (IRSA)小 ,根系在 30～ 60cm土层中分布较多 ;氮肥利用效率提高了 4倍 。
At the Beijing experimental base of the Sino-German cooperative p roject , optimized and conventional irrigationfertilization systems were carried out in 1999-2000.Total 318 mm water with seven times and 60 kg/ha nitrogen with two t imes. were applied in the optimized system.Total 329 mm water with four irrgatio n times and 300 kg/ha nitrogen with base and top-dressing fertilization comprised the conventional system.The results were as follow.The root size of the optim ized system was larger and integrated root system age (IRSA) at flowering stage was younger than that of the conventional system,and the ratio of root in the 3 0-60 cm soil layer was also increased.There were no significant difference in bo th grain yield and water use efficiency between the two systems,although the opt imized system increa sed nitrogen use efficiency 4 times comparing with conventional one.
出处
《华北农学报》
CSCD
北大核心
2000年第z1期55-59,共5页
Acta Agriculturae Boreali-Sinica
基金
中德合作项目A2子项目
关键词
水氮管理系统
冬小麦
根系
Waternitrogen system
Winter wheat
Root system
