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OUTLOOK AND 40 YEARS′ REVIEW OF HIGH YIELDING CULTIVATION IN DOUBLE RICE IN HUNAN PROVINCE

Zou Yingbin (Hunan Agricultural University,Changsha,410128)  
his paper reviewed 40 years′ history of high yielding cultivation in double rice in Hunan province and summaried as 3 development periods:(1) The period from the beginning of 60s′ to the middle of 70s′ is of the panicle number cultivation modle by using short plant varieties;(2) The period from the middle of 70s′ to the and of 80s' is of both panicle number and large panicle cultivation modle because of the extension of indinca hybrid rice;(3)The period in 90s′ is of the weighty panicle cultivation modle because of the application of hybrid rice with middle plant height, large panicle and middle tillering ablity. This paper also introduced key points of 10 high yielding techniques of representation of double rice, and discussed the study content and characteristics of double rice cultivation development facing to 21 century.
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