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《Jiangsu Journal of Agricultural Sciences》 1990-03
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Evolution of Yield and Related Characters of Medium lndica Rice Cultivars in Jiangsu Since 1950s

Yao Lisheng, Gao Hengguang, Yang Libin, He Shunshen Gu Genbao, Sun Mingfa and Gu Laishun (Institute of Agricultural Sciences of the Sea Coast District, Yancheng,Jiangsu 224000)  
The yield, yield components, plant form and physiological characters of 22 typical cultivars of medium Indica rice selected in Jiangsu since the 1950s were evaluated in a randomized block design with 4 replications in 1987 and 1988. The yield of medium Indica rices in Jiangsu had been doubled since the 1950s. It was completed in two leaps-the first was transition from local varieties in the early period to short-stalked varieties of the middle period with a yield increase of 80.04 percent,and the second was from short-stalked varieties to hybrid rice with a yield increase of 15.54 percent. The increase in yield mainly resulted from the increase in total grains per spike which showes higher genetic correlation to yield. The height of stalk changed from high to short, to medium short, and to medium. Leaf erectness, photosynthe-ticrate, root vitality, lodging resistance and harvest index were higher in varieties of the middle and current periods than in varieties of the early period. The biomass yield changed in correspondence with the grain yield. The net assimilation rate and tillering ability showed little changes. The authors suggest that in selection of medium Indica rice cultivars, the medium stalk and big spike should be taken as goals.
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