Relationships between biochemical qualities of paddy rice and climate conditions in the Anning River Valley

Abstract

Abstract: Base on the experimental data of paddy rice planted geographically periodically without control in the Anning River Valley of Sichuan Province,this paper quantitatively analyzed the effects of meteorological conditions from 40 days before heading to ripeness on the biochemical qualities of paddy rice,and developed a model about the integrated relationships between biochemical qualities of paddy rice and mean temperature,daily range of temperature and daylight hours,which would be of significance both for the instruction of paddy distribution in the Anning River Valley and for improving rice qualities via adjusting planting time.The results showed that climate conditions had a great effect on the biochemical qualities of paddy rice,which was different in ways and in critical periods.The period when the correlation between some ingredients of rice and climate conditions was most significant was before or after,or from before to after full heading,which widened the existing knowledge about the period which was important for paddy rice qualities forming.Applying this finding in the Anning River Valley during 2002～2003,the accumulated high-grade paddy farming area stood at 73 000 hm²,30 000 hm² more than that in 2001,and brought 0.2 billion yuan increament to the peasants,promoting the development of high-grade paddy greatly.

Key words: Paddy rice, Biochemical qualities, Climate conditions, Anning River Valley

CLC Number:

S162.5

PENG Guozhao, BAI Jian, WANG Jingbo . Relationships between biochemical qualities of paddy rice and climate conditions in the Anning River Valley[J]. Chinese Journal of Applied Ecology, 2004, (12): 2277-2281.

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