Pedosphere 30(6): 863--873, 2020
ISSN 1002-0160/CN 32-1315/P
©2020 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Integrated rice management simultaneously improves rice yield and nitrogen use efficiency in various paddy fields
Yujiao DONG1,2, Fanwen ZENG3, Jiang YUAN2, Guangbin ZHANG4, Yuanxue CHEN5, Xuejun LIU1, Padilla HILARIO6, Tusheng REN1, Shihua LU2
1College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193(China)
2Soil and Fertilizer Institute, Sichuan Academy of Agricultural Sciences, Chengdu 610066(China)
3Bureau of Agriculture in Shehong County, Suining City, Sichuan Province, Shehong 629200(China)
4State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China)
5Sichuan Agricultural University, Wenjiang 611130(China)
6Kadoorie Farm and Botanic Garden, Hong Kong 999077(China)
      The hilly area of Southwest China is a typical rice production area which is limited by seasonal droughts and low temperature in the early rice growth period. A field experiment was conducted on three typical paddy fields (low-lying paddy field, medium-elevation paddy field, and upland paddy field) in this region. Nitrogen (N) treatment (180 kg N ha-1 year-1) was compared to a control treatment (0 kg N ha-1 year-1) to evaluate the effects of integrated rice management (IRM) on rice growth, grain yield, and N utilization. Integrated rice management integrated raised beds containing plastic mulch, furrow irrigation, and triangular transplanting. In comparison to traditional rice management (TRM), IRM promoted rice tiller development, with 7-13 more tillers per cluster at the maximum tillering stage and 1-6 more tillers per cluster at the end of tillering stage. Integrated rice management significantly increased the rice aboveground biomass by 34.4%-109.0% in different growth periods and the aboveground N uptake by 25.3%-159.0%. Number of productive tillers significantly increased by 33.0%, resulting in a 33.0% increase in grain yield and 8.0% improvement of N use efficiency (NUE). Grain yields were significantly increased in all three paddy fields assessed, with IRM being the most important factor for grain yield and productive tiller development. Effects of paddy field type and N level on N uptake by aboveground plants were reflected in the rice reproductive growth period, with the effects of IRM more striking due to the dry climate conditions. In conclusion, IRM simultaneously improved rice yield and NUE, presenting a valuable rice management technique in the paddy fields assessed.
Key Words:  grain yield,hilly area,nitrogen uptake,paddy field type,plastic mulch,traditional rice management
Citation: Dong Y J, Zeng F W, Yuan J, Zhang G B, Chen Y X, Liu X J, Hilario P, Ren T S, Lu S H. 2020. Integrated rice management simultaneously improves rice yield and nitrogen use efficiency in various paddy fields. Pedosphere. 30(6):863-873.
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