Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (27): 66-73.doi: 10.11924/j.issn.1000-6850.casb2021-1017

Special Issue: 生物技术

Previous Articles     Next Articles

Migration and Transformation Pathways of Nitrogen in Simulated Paddy Field System with Deep Application of Urea

ZHU Jingping1,2(), DENG Qiuhong1,2   

  1. 1. School of Environment and Resources, Southwest University of Science and Technology, Mianyang, Sichuan 621000
    2. Low-cost Wastewater Treatment Technology International Sci-tech Cooperation Base of Sichuan Province, Mianyang, Sichuan 621000
  • Received:2021-10-25 Revised:2021-12-26 Online:2022-10-05 Published:2022-09-21

Abstract:

To explore the migration and transformation pathways of nitrogen in soil and water system after urea was deeply applied to soil, the self-made device was used to simulate paddy field, and the subsequent experiments were carried out by measuring the changes of nitrogen concentration and related indicators in soil and surface water. The results showed that ammonia volatilization and nitrification were the main reactions in surface water, while denitrification was the main reaction in soil. After urea was deeply applied to soil for 15 days, the proportion of nitrogen loss in the system reached 14.86% of the total fertilization, and the loss came from ammonia volatilization and biological denitrification, which accounted for 68.95% and 31.05% of the total loss, respectively. The migration and transformation pathways of nitrogen in urea-treated paddy field are complicated, and the study could offer technical reference for rational fertilization and coping with farmland non-point source pollution by analyzing the reactions and migration pathways of nitrogen in soil and water system.

Key words: soil and water system, urea deep application, biochemical reaction, migration and transformation, nitrogen loss

CLC Number: