期刊
CROP JOURNAL
卷 5, 期 2, 页码 151-158出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.cj.2016.06.002
关键词
Alternate wetting and drying (AWD); Grain yield; Nitrogen use efficiency; Rice; Water use efficiency
资金
- National Basic Research Program (973 Program) [2012CB114306]
- National Natural Science Foundation of China [31461143015, 31271641, 31471438]
- National Key Technology Support Program of China [2014AA10A605, 2012BAD04B08]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Top Talent Supporting Program of Yangzhou University [2015-01]
- Jiangsu Creation Program for Postgraduate Students [KYZZ15_0364]
To meet the major challenge of increasing rice production to feed a growing population under increasing water scarcity, many water-saving regimes have been introduced in irrigated rice, such as an aerobic rice system, non-flooded mulching cultivation, and alternate wetting and drying (AWD). These regimes could substantially enhance water use efficiency (WUE) by reducing irrigation water. However, such enhancements greatly compromise grain yield. Recent work has shown that moderate AWD, in which photosynthesis is not severely inhibited and plants can rehydrate overnight during the soil drying period, or plants are rewatered at a soil water potential of -10 to -15 kPa, or midday leaf potential is approximately -0.60 to -0.80 MPa, or the water table is maintained at 10 to 15 cm below the soil surface, could increase not only WUE but also grain yield. Increases in grain yield WUE under moderate AWD are due mainly to reduced redundant vegetative growth; improved canopy structure and root growth; elevated hormonal levels, in particular increases in abscisic acid levels during soil drying and cytokinin levels during rewatering; and enhanced carbon remobilization from vegetative tissues to grain. Moderate AWD could also improve rice quality, including reductions in grain arsenic accumulation, and reduce methane emissions from paddies. Adoption of moderate AWD with an appropriate nitrogen application rate may exert a synergistic effect on grain yield and result in higher WUE and nitrogen use efficiency. Further research is needed to understand root-soil interaction and evaluate the long-term effects of moderate AWD on sustainable agriculture. (C) 2016 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据