| 1. | Nitrogen losses in paddy fields in shanghai suburbs
上海郊区稻田氮素流失研究 |
| 2. | Nitrogen loss in internal - loop granular sludge bed nitrifying reactor
内环流颗粒污泥床硝化反应器的氮损失 |
| 3. | Different forms of organic nitrogen loss in soil by runoff in slope land of loess plateau
黄绵土不同形态有机氮径流流失规律 |
| 4. | Nitrogen loss of loess soil as affected by nh4no3 applying in process of water erosion
水蚀条件下硝酸铵施用对黄绵土氮素流失的影响 |
| 5. | So these 9 days after n application was the critical time to prevent the nitrogen loss and the measures should be taken
所以这9天是防止氮素流失的关键时期，有必要采取措施防止氮素流失。 |
| 6. | Comparison of nitrogen loss and use efficiency of vegetable in vegetable field under traditional and improved water and n - fertilizer management
传统和优化水氮管理对蔬菜地土壤氮素损失与利用效率的影响 |
| 7. | It has an important reality meaning to apply urea reasonable , to control nitrogen loss in the paddy - field and to protect water ecology and environment
对于合理施肥、控制稻田氮素流失、保护地表水体生态环境具有极其重要的现实意义。 |
| 8. | Field trials of rainfall simulation were carried out to study effects of different rainfall intensities and nitrogen fertilizer application rates on nitrogen losses in rice - wheat rotation of taihu lake watershed
摘要应用田间模拟降雨，研究了太湖流域稻麦轮作方式下，不同雨强和施氮水平对农田氮素径流流失的影响。 |
| 9. | The dynamic change of nh4 + , no3 - and tn , under the situation which urea was applied in the high fertility paddy - field in yuhang of hangzhou city with a lysimeter which was designed and made by ourselves , was studied and analyzed in order to find the rules of the change in the water - body of surface and the leakage rule of nitrogen , to reduce the effect of nitrogen loss on the water pollution
借助自行设计制作的稻田渗漏计，在杭州余杭对高肥力稻田不同施用尿素氮肥情况下，稻田地表水和渗漏水中铵态氮、硝态氮和总氮(简称三氮)的动态变化规律进行了研究分析，以利于发现氮素在地表水体变化和淋失规律，尽量减少氮素淋失对地下水体所造成的影响。 |
| 10. | ( 3 ) the farming systems which had a less degree of soil erosion and sedimentation , organic carbon was lost mainly through runoff but in farming systems in which soil erosion was serious such as in grass stripe , contour ditch , traditional farming system , the loss was through bed load . nitrogen loss through runoff was 81 . 9 % - 93 . 4 % of the total . this loss through runoff comprised 78 % - 87 . 6 % dissolved nhvn and no " 3 - n although the former was slightly higher than latter as it made up 55 . 14 % of the lost nitrogen
( 3 )侵蚀程度较轻，泥沙流失量较小，特别是推移质流失量较小的农作措施处理的径流小区，如休闲处理、等高土埂和等高处理的小区中有机碳流失以径流流失为主，相反，如水平草带处理、水平沟处理和顺坡农作处理的径流小区中，有机碳流浙江大学博土学位论文失以推移质流失为主。 |
