一嘲11曼曼曼曼曼曼曼曼曼曼量量量舅暑鼍曼曼置曼曼量量曼曼曼量量量毫。-■,Z.'-7曼目录中文摘要????????????????????????????????????I 英文摘要???????????????????????????????????III 1前言????????????????????????????????????..1 ??????????????????????????????1 ??????????????????????????????2 ???????????????????????????2 ?????????????????.4 ????????????????????????????6 2材料与方法?????????????????????????????????1 6 ??????????????????????????????????????????????1 6 ????????????????????????????????..1 6 ????????????????????????:????????.17 ??????????????????????????????..1 7 ????????????????????????????????..1 7 3结果与分析?????????????????????????????????18 、硝态氮含量的影响??????????????..18 ???????????????????????20 ???????????????????????23 ??????????????????一27 4结论????????????????????????????????????????????????30 致谢?????????????????????????????????????????????????.3 参考文献???????????????????????????????????32 攻读硕士学位期间发表的学术论文????????????????????????38 万方数据 CONTENTS CONTENTS Abstract inChinese????????????????????????????????????????..1 Abstract inEnglish?????????????????????????????????????????III Objectives andmeanings???????????????????????????1 1.:!Nationalandinternational advance????..?.?.?.??.????.?????.?.?????????2 Application ofnitrogen fertilizerin agriculture??????????????????????~2 Environmental issuescaused by lowNUE and nitrogen loss???????????????~4 Improve NUE???.?.??????.??.????.??????.???????????????..5 2Materials andMethods?????????????????????????????????????..1 5 Materials???????????????????????????????????????????..1 5 ????????????????????????????????????????????1 5 collecti013??????????????????????????????????????..1 6 ofsoilsamples????????????????????????????????..1 6 Statisticalanalysis???????????????????????????????????????1 6 3Results analysis??????????????????????????????????????????1 7 E岱ects ofdifferent
玉米施氮量和土壤硝态氮、铵态氮的动态变化 来自淘豆网www.taodocs.com转载请标明出处.