摘要
在太行山前平原区 ,小麦———玉米一年两熟秸秆全量还田的条件下 ,施氮量与土壤全氮含量呈正相关关系 ,相关系数达 0 6769～ 0 91 5 7 ;施氮量与土壤硝态氮含量呈显著的正相关关系 ,相关系数为 0 8445 ～ 0 970 3 。小麦玉米秸秆全量还田 ,保持土壤氮素平衡值为零时的施氮量 30 0～ 360kg/hm2 。小麦最佳施氮量 1 60 5kg/hm2 ,玉米最佳施氮量1 96 5kg/hm2 ,小麦———玉米两熟最佳施氮量 35 7kg/hm2 时 。
Under the conditions that all the stalks were returned into the soil in wheat corn double cropping system for one year, the nitrogen content in the soil was positively correlated with nitrogen applying amount (NAM). The correlated coefficient was 0 8445～0 9703 The NAM which keep 0 balance value of soil nitrogen was between 300 and 360 kg/hm 2.In order to keep the balance of soil nitrogen, the optimum NAM for wheat, corn, and wheat-corn double cropping were 160 5, 196 5, 357 kg/hm 2, respectively.
出处
《河北农业科学》
2004年第1期10-13,共4页
Journal of Hebei Agricultural Sciences
基金
河北省"九五"科技攻关项目 ( 962 2 0 12 9D)"山前平原持续农业高产高效研究"部分内容
