Crops ›› 2021, Vol. 37 ›› Issue (6): 101-107.doi: 10.16035/j.issn.1001-7283.2021.06.016

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Effects of Moldboard Plow Tillage under all Straw Returning in Late Rice Season on Greenhouse Gas Emissions and Yield in Double Rice-Cropping System

Tang Gang1(), Liao Ping1, Sui Feng2, Lü Weisheng3, Zhang Jun4, Zeng Yongjun1, Huang Shan1()   

  1. 1Ministry of Education and Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding/College of Agriculture, Jiangxi Agricultural University, Nanchang 330045, Jiangxi, China
    2Ganzhou Institute of Tobacco Sciences, Ganzhou 341000, Jiangxi, China
    3Jiangxi Institute of Red Soil, Nanchang 331717, Jiangxi, China
    4Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2020-11-04 Revised:2020-12-07 Online:2021-12-15 Published:2021-12-16
  • Contact: Huang Shan E-mail:1414650688@qq.com;ecohs@126.com

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Abstract:

Moldboard plough tillage (PT) is beneficial for returning straw to the field. In order to explore the influence of different farming measures on double-season rice yield and greenhouse gas emissions, a field trial of two treatments, rotary tillage (RT) and PT, were conducted to examine the effects of PT in late season with full incorporation of straw on CH4 and N2O emissions, and grain yield. The CH4 and N2O fluxes were measured using a static chamber gas chromatography method in current late season and early season of next year. The results showed that PT significantly reduced CH4 accumulation emissions flux, global warming potential and greenhouse gas intensity in the current late season by 19.04%, 19.19% and 22.02%, respectively, compared to RT. However, no significant influence of tillage on N2O emissions was found. In addition, greenhouse gas emissions were not significantly affected by tillage in the next early season. Thus, the effect of PT on the reduction of greenhouse gas emissions only appeared in the current late season. In addition, the grain yield and its components in both seasons were not different between PT and RT. In the short term, plowing in late rice therefore benefited the reduction of greenhouse gas emissions without impairing the rice yield with full straw incorporation

Key words: Double rice-cropping system, Tillage practice, Greenhouse gas emissions, Yield

Fig.1

The dynamics of water depth in the field during 2018-2019"

Fig.2

The dynamics of temperature in the field during 2018-2019"

Table 1

Effects of moldboard plow tillage under all straw return in the late rice season on grain yield and its components in double rice-cropping system"

年份
Year		 季别
Season		 处理
Treatment		 有效穗数
Effective panicles (×104/hm2)		 穗粒数
Grains per panicle		 千粒重
1000-grain weight (g)		 结实率
Seed setting rate (%)		 产量
Yield (kg/hm2)
2018 晚稻 RT 281.58aA 179.13aA 22.43aA 82.40aA 8658.49aA
PT 294.36aA 177.08aA 22.61aA 82.45aA 8887.78aA
2019 早稻 RT 280.92aA 150.69aB 22.69aA 78.14aA 7441.03aB
RT 289.15aA 152.38aB 22.53aA 80.46aA 7497.44aB

Fig.3

Effects of moldboard plow tillage under all straw return in the late rice season on CH4 emission fluxes in double rice-cropping system"

Fig.4

Effects of moldboard plow tillage under all straw return in the late rice season on N2O emission fluxes in double rice-cropping system"

Table 2

Effects of moldboard plow tillage under all straw return in the late rice season on CH4 and N2O accumulation emission fluxes, GWP, and GHGI in double rice-cropping system"

年份
Year		 季别
Season		 处理
Treatment		 CH4累积排放量
CH4 accumulation emission flux (kg/hm2)		 N2O累积排放量
N2O accumulation emission flux(kg/hm2)		 综合温室效应
GWP (kg/hm2)		 温室气体排放强度
GHGI (kg/kg)
2018 晚稻 RT 372.91aA 0.25aA 9398.38aA 1.09aA
PT 301.90bA 0.16aA 7594.91bA 0.85bA
2019 早稻 RT 134.40aB -0.05aB 3344.21aB 0.45aB
RT 154.09aB -0.06aB 3833.49aB 0.51aB
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