| Effects of lower limit soil water potential on rice yield in cold region |
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| DOI：10.7606/j.issn.1000-7601.2011.02.08 |
| Key Words: rice in cold region soil moisture yield |
| Author Name | Affiliation | | LU Yandong | Rice Institute of Shenyang Agricultural University, Shenyang, Liaoning 110161, China
Key Laboratory of Northern Japonica Rice Breeding of Liaoning， Shenyang, Liaoning 110161， China
College of Agronomy，Heilongiang Bayi Agricultural University， Daqing ，Heilongiang 163319， China | | ZHENG Guiping | College of Agronomy，Heilongiang Bayi Agricultural University， Daqing ，Heilongiang 163319， China | | GUO Xiaohong | College of Agronomy，Heilongiang Bayi Agricultural University， Daqing ，Heilongiang 163319， China | | YIN Dawei | Rice Institute of Shenyang Agricultural University, Shenyang, Liaoning 110161, China
Key Laboratory of Northern Japonica Rice Breeding of Liaoning， Shenyang, Liaoning 110161， China | | MA Dianrong | Rice Institute of Shenyang Agricultural University, Shenyang, Liaoning 110161, China
Key Laboratory of Northern Japonica Rice Breeding of Liaoning， Shenyang, Liaoning 110161， China | | XU Zhengjin | Rice Institute of Shenyang Agricultural University, Shenyang, Liaoning 110161, China
Key Laboratory of Northern Japonica Rice Breeding of Liaoning， Shenyang, Liaoning 110161， China | | CHEN Wenfu | Rice Institute of Shenyang Agricultural University, Shenyang, Liaoning 110161, China
Key Laboratory of Northern Japonica Rice Breeding of Liaoning， Shenyang, Liaoning 110161， China |
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| Abstract: |
| With the rice varieties of Kenjiandao 5 (J) and Kendao 12 (D) as test materials, soil water potential.
(SWP) was examined rigorously with negative pressure soil moisture tensiometer. Field water controlling experiments were carried out in the Institute of Jiansanjiang， Daxing Farm Garden and Qing'an Experimental Station from 2007 to 2008. Pot water controlling experiments were carried out in potted trial base of Heilongjiang Bayi Agricultural University (Daqing)，and intemittent contolling water treatments (ICWT) at- 20 kPa and- 10 kPa of SWP were carried out from re green to mature. The effects of soil moisture on yield of rice were studied systematically in cold region. The results are as follows: the ICWT at-10 kPa of SWP was beneficial to improve the rice yield of different regions . The yield incre easing ranges of diferent varieties in Daxing and Qingan were 1. 60%~7.67% and 1. 51%~6.95% respectively. The results of potted experiments showed that panicles per hill of two varieties was decreased under the condition of con-trolling water treatment，and D variety reached the extremely significant level ; Grain numbers of superior and middle po-sition of J variety and middle and inferior position of D variety were increased; Kernel seting rate of two varieties were in creased，the increasing ranges of middle and inferior position of J variely reached the significant level, kermnel setting rate of superior, middle and inferior position of D variety increased 4.86%，5.42% and 13.30% respectively. Biomass of J
variety was increased, biomass of D variety was signficantly decreased, and economic indexs of two varieties increased 5.73% and 3.21% respectively; Economic yield of J variety increased 14. 47%，economic yield of D variety was de-creased. ICWT at-10 kPa of SWP were carried out in different eclogical regions, the rates of water saving were all above 20%. |
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