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《Acta Agronomica Sinica》 2015-11
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Advantages and Their Formation Characteristics of the Highest Population Productivity of Nitrogen Fertilization in Japonica/Indica Hybrid Rice of Yongyou Series

MENG Tian-Yao;XU Jun-Wei;SHAO Zi-Bin;GE Meng-Jie;ZHANG Hong-Cheng;WEI Hai-Yan;DAI Qi-Gen;HUO Zhong-Yang;XU Ke;GUO Bao-Wei;JING Pei-Pei;Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Yangzhou University;Innovation Center of Rice Cultivation Technology in Yangtze River Valley, Ministry of Agriculture;  
A field experiment was conducted using the representative varieties of four types(indica/japonica hybrid rice, inbred japonica rice, hybrid japonica rice, and hybrid indica rice) to achieve the highest rice yield for each variety that is defined as the highest population productivity of N fertilization at six nitrogen fertilization levels(0, 187.5, 225.0, 262.5, 300.0, and 337.5 kg ha–1). On this basis, the differences in yield components, duration of main growth stages, dry matter weight, and leaf area index at main growth stages for four types were studied. The results were as follows:(1) The highest grain yield rice was achieved under 225.0–262.5 kg ha–1 nitrogen application for hybrid indica, 300.0 kg ha–1 for inbred japonica rice, 262.5–300.0 kg ha–1 for hybrid japonica rice and 262.5–300.0 kg ha–1 for indica/japonica hybrid rice.(2) The population productivity of indica/japonica hybrid rice was the highest, followed by hybrid japonica rice, inbred japonica rice, and hybrid indica rice. Indica/japonica hybrid rice had more spikelets and spikelets per panicle, but great fluctuation was observed in number of spikelets per panicle across two years. Inbred japonica rice had more panicles and higher seed-setting rate while hybrid japonica rice had the highest 1000-grain yield weight.(3) The longest duration from sowing to heading stages was observed for hybrid japonica rice. The duration from heading to maturity of indica/japonica hybrid rice was about 60 d, which was significantly higher than that of other three variety types. Grain yield per day of japonica/indica hybrids was the highest among the four variety types in two years.(4) The dry matter weight and leaf area index at heading, 20 d after heading, and maturity stage of indica/japonica hybrid rice were higher higher than thoes of other three variety types. As for dry matter accumulation, indica/japonica hybrid rice was the highest from heading to maturity stage. Moreover, the leaf area duration from jointing to heading and from heading to maturity in indica/japonica hybrid rice was also higher than that of other three variety types. Great yield of japonica/indica hybrids of Yongyou series over other three variety types is mainly attributed to more spikelets per panicle, longer filling phase, higher grain yield per day and biomass production after heading.
【Fund】: 国家粮食丰产科技工程项目(2011BAD16B03);; 江苏省农业科技自主创新项目[CX(12)1003-9];; 国家公益性行业(农业)科研专项(201303102)资助
【CateGory Index】: S511
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