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Verification and Evaluation of The "Three Optimums Theory" in Rice Breeding for Maximum Yield

Yang Shouren;Zhang Longbu;Chen Wenfu;Xu Zhengjin;Wang Jinmin(Rice Laboratory, Shenyang Agricultural University Shenyang 110161)  
Rice breeding for maximum yield is a hot topic today in the rice grower community of the world and a hard nut to crack into the bargain. For many years, the researchers in the Rice Laboratory of Shenyang Agricultural University have been devoted to that In 1987 they discussed the subject in publications at home and abroad, in whiCh they first introduced the general strategy of combining ideal plant morphology with the use of vigor.Afterward, drawing on the wisdoms of other researchers, they experimented with test materials featuring "rather short stalks" and "rather big panicles", but the results were not very satisfactory. Then they switched from the "two rathers" to the "three optimums" (optimum plant height, optimum panicle size and optimum tillering power) .Three years' (1991 through 1993)verification especially the demonstration of the San Hao(meaning three optimums) No. 1 rice in 1993 in Liaozbong County of Liaoning Province, tempted them tO believs that theretically, the shift from the "tworathers" to The "three optimums" marked a further refinement of the criteria for selecting progeny,and that the latter as sumes an exploratory character for the science of rice breeding.In practice,this new approach guaranteed a moderate success in three years,thus altered the picture of plodding progression.Besides,it gives the essentials in simple language and is credited with practicality.This study may serve as a prcedent of spontaneously applying the modern theory of cybernetics to rice breeding.
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