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《FUJIAN JOURNAL OF AGRICULTURAL SCIENCES》 1995-01
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Studies on Key Components for Obtaining High Grain Yield of Hybrid Rice

Li Yithen ; Huang Yumin ; Zhuang Zhanlong ; Huang Yachang and Yu Ruiyuan (Rice&Wheat Research Institute,Fujian Academy of Agri. Sci. Fuzhou350019;Agricultural Bureau of Longhai City, Longhai 363100)  
The results indicated that , the annual averaged yield of hybrid rice with double cropping in Longhai was 15.6~17.6t/hm2. Among the components , the total grain number per unit area was the most important to the yield of high yielding field ,and the panicle number was the most im-portant to total grain number per unit area. In high yielding condition, the modle of heading num-ber appeared “1+3+7”,i.e. under the condition of planting 25 hills in 1 m2 and one hill with one seedling, each hill will produce one main stem head, 3 tillering heads emerged during seedling peri-od and 7 tillering heads during early tillering period. More than 95%tillers emerged during seedling period was able to grow to heading. The effective tillers emerged in field-growing period were the ones emerged with the growth of first 4 leaves after transplanting, The end of effective tillering in field was found at the period when 2.0~3. 5 leaves emerged before maximum tiller-ing. The remainder of leaf age after maximum tillering was 2.0~2. 5 leaves, which was equal to the duration from secondary branch differentiation to spikelet differentiation.
【CateGory Index】: S511.103.2
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