Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (4): 678-687.DOI: 10.3969/j.issn.1004-1524.2021.04.13

• Environmental Science • Previous Articles     Next Articles

Effects of staw-derived biochar on ammonia volatilization in tropical soil-rice system

WU Peicong1,2(), ZHANG Peng2,3, SHAN Ying2, ZOU Ganghua2, DING Zheli4, ZHU Zhiqiang1,*(), ZHAO Fengliang2,*()   

  1. 1. College of Tropical Crops, Hainan University, Haikou 570228, China
    2. Institute of Environmental and Plant Protection, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
    3. College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China
    4. Haikou Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
  • Received:2020-12-23 Online:2021-04-25 Published:2021-04-25
  • Contact: ZHU Zhiqiang,ZHAO Fengliang

Abstract:

Ammonia volatilization is one of the main pathways of nitrogen loss in rice field. As a practical agronomic measure to improve soil quality and agricultural sustainability, the application of straw-derived biochar may effectively reduce ammonia volatilization emission. In this study, six treatments including no nitrogen fertilization (ON), only chemical fertilizer (CT), biochar (BI), biochar+chemical fertilizer (CBI), straw (ST) and straw+chemical fertilizer (CST) were set up in the soil column experiment to study the effects of direct returning and carbonized returning of rice straw on ammonia volatilization in tropical soil-rice system. The results showed that compared with straw direct returning to the field, biochar application reduced ammonia volatilization flux and accumulated ammonia volatilization amount in the rice field. Compared with CT, CBI treatment resulted in a 4.1% reduction in accumulated ammonia volatilization amount, mainly due to biochar’s unique physic-chemical properties, which decreased the concentration of soil ammonium nitrogen (NH4+-N) through adsorption. Therefore, application of straw-derived biochar is an effective way to control ammonia volatilization and to reduce agricultural non-point source pollution in tropical soil-rice system.

Key words: rice straw, biochar, tropical soil-rice system, ammonia volatilization

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