| Effect of water supply during grain filling stage on growth and yield of rice in cold region |
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| DOI：10.7606/j.issn.1000-7601.2012.05.22 |
| Key Words: water supply rice in cold region growth yield |
| Author Name | Affiliation | | LIU Yanguang | Fuhua Company of Heilongjiang Province, Shuangyashan, Heilongjiang 155811, China | | CAO Chunrui | Daqing Hubin School of Heilongjiang Province, Daqing, Heilongjiang 163316, China | | TIAN Hongxu | Zhaoguang farm of Heilongjiang Province, Beian, Heilongjiang 164021, China | | MA Yan | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | WEI Changkai | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | WANG Rui | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | LV Yandong | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China |
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| Abstract: |
| For studying the effects of water supply during grain filling stage on growth and yield of rice in cold region, Varieties Kenjiandao 5 and Kendao 12 were planted through potted planting in rainproof chamber. Th
e soil water potential (SWP) was examined through negative pressure soil moisture meter. The main results are as follows: In intermittent irrigation at -8～-10 kPa of SWP during grain filling stage, panicle length and panicle weight of the two varieties increased, dry matter weight and leaf area of the two varieties decreased; panicle number of two varieties decreased, kernel setting rate, 1000-grain weigh and economic yield of two varieties decreased. In unremitting irrigation at -18～-20 kPa and -28～-30 kPa of SWP during grain filling stage, panicle length of two varieties increased, panicle weight, dry matter weight and leaf area of two varieties decreased; panicles, kernel setting rate, 1000-grain weigh and economic yield of two varieties decreased. Intermittent irrigation at -8～-10 kPa of SWP during grain filling stage could be used as irrigating index for reducing rice production cost and improving economic benefit in cold region. Unremitting irrigation below -18～-20 kPa of SWP during grain filling stage was not suitable. |
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