| Effect of water supply before heading on panicle traits and yield of rice in cold region |
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| DOI：10.7606/j.issn.1000-7601.2011.06.06 |
| Key Words: water supply rice in cold region panicle traits yield |
| Author Name | Affiliation | | GUO Xiaohong | College of Agronony, Heiongjiang Bayi Agricultural University, Daqing 163319， China | | ZHENG Guiping | College of Agronony, Heiongjiang Bayi Agricultural University, Daqing 163319， China | | YIN Dawei | Rice Institute, Shenyang Agricultural University, Shenyang 110161, China | | LI Mingjie | Heilongjiang Zhaoyuan Farm，Daqing 166517，China | | WANG Debin | Heilongjiang Zhaoyuan Farm，Daqing 166517，China | | QIAN Haixial | College of Agronony, Heiongjiang Bayi Agricultural University, Daqing 163319， China | | WEI Changkai | College of Agronony, Heiongjiang Bayi Agricultural University, Daqing 163319， China | | LV Yandong | College of Agronony, Heiongjiang Bayi Agricultural University, Daqing 163319， China |
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| Abstract: |
| With Kenjiandao 5 and Kendao 12 as material，the effects of water supply before heading on panicle traits and yield of rice in cold region were studied with potted planting by examining soil water potential (SWP) with neg-
ative pressure soil moisture tensiometer. The results indicated:When intermittent irrigation at -8~-10 kPa of SWP
was carried out during the stage before heading, panicles per hill of two varieties was decreased, grain number per panicle of two varieties were very significantly decreased; kernel seting rate and 1000 grain weight of two varieties were in-creased; economic yield of Kenjjandao 5 was increased, while economic yield of Kendao 12 was decreased. When un-remitting imigation at-1 8~-20 kPa and -28~-30 kPa of SWP was carried out before heading，the panicle length of two varieties were very significantly shortened; the number of primary branches degradation of two varieties were in-creased; the panicle weiqht，primary rachis branches number, second rachis branches number，panicles per hill，grain number per panicle and 1000 grain weight of two varieties were significantly or very significantly decreased; and economic yield of two varieties were very significantly decreased. Intemittent irmigation at -8~-10 kPa of SWP before heading could be used as irigating index for producing high yield and high quality rice in cold region, while it is unfavorable to. carry out unremitting irrigation below -18~-20 kPa of SWP before heading. |
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