Influence of tillage practices and straw incorporation on soil aggregates, organic carbon, and crop yields in a rice-wheat rotation system.
In this study, a fixed-site field experiment was conducted to study the influence of different combinations of tillage and straw incorporation management on carbon storage in different-sized soil aggregates and on crop yield after three years of rice-wheat rotation. Compared to conventional tillage, the percentages of >2 mm macroaggregates and water-stable macroaggregates in rice-wheat double-conservation tillage (zero-tillage and straw incorporation) were increased 17.22% and 36.38% in the 0-15 cm soil layer and 28.93% and 66.34% in the 15-30 cm soil layer, respectively. Zero tillage and straw incorporation also increased the mean weight diameter and stability of the soil aggregates. In surface soil (0-15 cm), the maximum proportion of total aggregated carbon was retained with 0.25-0.106 mm aggregates, and rice-wheat double-conservation tillage had the greatest ability to hold the organic carbon (33.64 g kg-1). However, different forms occurred at higher levels in the 15-30 cm soil layer under the conventional tillage. In terms of crop yield, the rice grown under conventional tillage and the wheat under zero tillage showed improved equivalent rice yields of 8.77% and 6.17% compared to rice-wheat double-cropping under zero tillage or conventional tillage, respectively.
College of Natural Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.|Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China.
Ke
K
Song
Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China.
Jianjun
J
Yang
Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China.
Yong
Y
Xue
Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China.
Weiguang
W
Lv
Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China.
Xianqing
X
Zheng
College of Natural Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Jianjun
J
Pan
D000383:Agriculture; D002244:Carbon / Q000032:analysis*; D018556:Crops, Agricultural; D009930:Organic Chemicals / Q000032:analysis; D012275:Oryza; D012987:Soil / Q000737:chemistry*; D014908:Triticum
D009930:Organic Chemicals; D012987:Soil; D002244:Carbon