Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《ACTA PEDOLOGICA SINICA》 1997-01
Add to Favorite Get Latest Update

APPLICATION AND CROP RECOVERY OF N-FERTILIZER IN HIGH-YIELDING PADDY FIELDS OF TAIHU REGION

Li Weibo;Wu Liusong and Liao Haqiu (Institute of Soil Science,Academia Sinica,Nanjing 210008)  
Currently, in the Taihregion, the application of N fertilizer in the high-yieding paddy fields of ricewheat double cropping system averages around 520kg N per hectare per year.Experiments for years shewed that N fertilization at a rate of 300kg N per hectare per year increased the crop yield significantly by 13.5kg of grain per kg of N applied, with the N recovery rate reaching 40.3%; but the increase was not significant at a rate of 450kg N, and 7.29kg of grain was increased by per kg of N applied with the N recovery rate dropping to 17.2% at a rate of 600kg N per hectare per year.In the last case, the N content in rice straws and sterility grain rate went up while the thousand-grain weight and the yield declined. Consequently, at the current yield level of 10-12 ton per hectare on the high yielding paddy field, the N fertilization rate was recommended to be at 375kg N per hectare per year, which could save 20-30% N-fertilizer as compared with the rate for large-area production.
【Fund】: 中国科学院“八五”重点课题!Z084号的研究
【CateGory Index】: S143
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved