TY - JOUR
T1 - Effect of irrigation regime on grain yield, water productivity, and methane emissions in dry direct-seeded rice grown in raised beds with wheat straw incorporation
AU - Wang, Zhiqin
AU - Gu, Daojian
AU - Beebout, Sarah S.
AU - Zhang, Hao
AU - Liu, Lijun
AU - Yang, Jianchang
AU - ZHANG, Jianhua
N1 - Funding Information:
We are grateful for grants from the National Key Research and Development Program of China (2016YFD0300206-4), the National Natural Science Foundation of China (31461143015, 31471438), the National Key Technology R&D Program of China (2014AA10A605), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD-2015-01), the Top Talent Supporting Program of Yangzhou University (2015-01), and the Hong Kong Research Grant Council (14122415, 14160516, 14177617, AoE/M-05/12, AoE/M-403/16).
Funding Information:
We are grateful for grants from the National Key Research and Development Program of China ( 2016YFD0300206-4 ), the National Natural Science Foundation of China ( 31461143015 , 31471438 ), the National Key Technology R&D Program of China ( 2014AA10A605 ), the Priority Academic Program Development of Jiangsu Higher Education Institutions ( PAPD-2015-01 ), the Top Talent Supporting Program of Yangzhou University ( 2015-01 ), and the Hong Kong Research Grant Council ( 14122415 , 14160516 , 14177617 , AoE/M-05/12 , AoE/M-403/16 ).
PY - 2018/10
Y1 - 2018/10
N2 - Dry direct-seeded rice grown in raised beds is becoming an important practice in the wheat–rice rotation system in China. However, little information has been available on the effect of various irrigation regimes on grain yield, water productivity (WP), nitrogen use efficiency (NUE), and greenhouse gas emission in this practice. This study investigated the question using two rice cultivars in 2015 and 2016 grown in soil with wheat straw incorporated into it. Rice seeds were directly seeded into raised beds, which were maintained under aerobic conditions during the early seedling period. Three irrigation regimes: continuous flooding (CF), alternate wetting and drying (AWD), and furrow irrigation (FI), were applied from 4.5-leaf-stage to maturity. Compared with CF, both AWD and FI significantly increased grain yield, WP, and internal NUE, with greater increases under the FI regime. The two cultivars showed the same tendency in both years. Both AWD and FI markedly increased soil redox potential, root and shoot biomass, root oxidation activity, leaf photosynthetic NUE, and harvest index and markedly decreased global warming potential, owing to substantial reduction in seasonal CH4 emissions. The results demonstrate that adoption of either AWD or FI could increase grain yield and resource-use efficiency and reduce environmental risks in dry direct-seeded rice grown on raised beds with wheat straw incorporation in the wheat–rice rotation system.
AB - Dry direct-seeded rice grown in raised beds is becoming an important practice in the wheat–rice rotation system in China. However, little information has been available on the effect of various irrigation regimes on grain yield, water productivity (WP), nitrogen use efficiency (NUE), and greenhouse gas emission in this practice. This study investigated the question using two rice cultivars in 2015 and 2016 grown in soil with wheat straw incorporated into it. Rice seeds were directly seeded into raised beds, which were maintained under aerobic conditions during the early seedling period. Three irrigation regimes: continuous flooding (CF), alternate wetting and drying (AWD), and furrow irrigation (FI), were applied from 4.5-leaf-stage to maturity. Compared with CF, both AWD and FI significantly increased grain yield, WP, and internal NUE, with greater increases under the FI regime. The two cultivars showed the same tendency in both years. Both AWD and FI markedly increased soil redox potential, root and shoot biomass, root oxidation activity, leaf photosynthetic NUE, and harvest index and markedly decreased global warming potential, owing to substantial reduction in seasonal CH4 emissions. The results demonstrate that adoption of either AWD or FI could increase grain yield and resource-use efficiency and reduce environmental risks in dry direct-seeded rice grown on raised beds with wheat straw incorporation in the wheat–rice rotation system.
KW - Alternate wetting and drying
KW - Dry direct-seeding
KW - Furrow irrigation
KW - Methane emission
KW - Rice (Oryza sativa L.)
KW - Water productivity
UR - http://www.scopus.com/inward/record.url?scp=85050830458&partnerID=8YFLogxK
U2 - 10.1016/j.cj.2018.05.004
DO - 10.1016/j.cj.2018.05.004
M3 - Journal article
AN - SCOPUS:85050830458
SN - 2095-5421
VL - 6
SP - 495
EP - 508
JO - Crop Journal
JF - Crop Journal
IS - 5
ER -