JOURNAL OF NATURAL RESOURCES ›› 2011, Vol. 26 ›› Issue (6): 955-963.doi: 10.11849/zrzyxb.2011.06.006

• Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS • Previous Articles     Next Articles

Actual Nitrogen Rate and Its Multiple Effects in Rice-Wheat Rotation System of Taihu Lake Watershed: Empirical Analysis Based on Household Survey

JIAO Wen-jun1,2, MIN Qin-wen1, CHENG Sheng-kui1, LU Jia1, YAN Li-zhen1   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2010-01-27 Revised:2010-06-08 Online:2011-06-20 Published:2011-06-20

Abstract: The authors carried out a one-week household survey with stratified random sampling in Wujin District of Changzhou in 2009, then organized and analyzed data from a total of 237 questionnaires using SPSS statistical software. Main conclusions are as follows: 1) Actual nitrogen rate in rice-wheat rotation system of Taihu Lake Watershed was 513.09 kg·hm-2 per year with 310.91 kg·hm-2 in the rice season and 202.18 kg·hm-2 in the wheat season, which revealed that excessive application of nitrogen mainly existed in the rice season. 2) Nitrogen played an active role in increasing yield of rice and wheat, but their yield, nitrogen accumulation, agronomic efficiency and recovery efficiency tended to decrease when nitrogen rate climbed to a certain point. 3) Nitrogen surplus and loss continued to increase as nitrogen rate rose in rice-wheat rotation system of Taihu Lake Watershed and nitrogen loss was estimated to be 41.26 kg·hm-2 per year under current nitrogen rate.

Key words: rice-wheat rotation, nitrogen rate, yield increasing, nitrogen loss, Taihu Lake Watershed

CLC Number: 

  • S147.2