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《Scientia Agricultura Sinica》 2010-19
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Effects of Different Postures on Growth of Broadcasted Rice and the Regulating Factors of Physical Standing of Broadcasted Seedlings

GUO Bao-wei1,ZHANG Chun-hua1,WEI Hai-yan1,ZHANG Hong-cheng1,CHEN Hou-cun2,DAI Qi-gen1,HUO Zhong-yang1,XU Ke1,XING Lin1,GUAN Wen-wen1,HUANG Xing-fu1,YANG Xiong1(1 Jiangsu Province Key Laboratory of Crop Genetics and Physiology/Innovation Center of Rice Cultivation Technology in Yangtze Valley,Ministry of Agriculture/College of Agronomy,Yangzhou University,Yangzhou 225009,Jiangsu;2Crop Cultural Station,Hai'an County,Hai'an 226600,Jiangsu)  
Objective To provide a theoretical basis for improving the population starting point quality of broadcasted rice,the effects of different postures on broadcasted rice and their regulating factors were studied in this experiment.Method The effects of different postures on broadcasted rice were studied by preparing the upright seedlings,the leaning seedlings and the laying seedlings and the regulating factors of physical standing of broadcasted seedlings under the conditions involving soil preparations,broadcasting height,water depth and different soil ball rates were investigated.Result Standing and establishment of the upright seedlings came earlier than the leaning seedlings and the laying seedlings,and the upright seedlings' biomass,N accumulation,net assimilation rate,lodging resistance and harvest yield were higher than that of the and the seedlings laying seedlings.The rate of the upright seedlings was the highest under the conditions that the soil of top 5-6 cm was soft and the broadcasting height was 3 m,which was 81%.The rate of the upright seedlings decreased gradually as water depth increased.The plastic trays with bigger hole should be chosen moderately for raising seedling and the height of seedling should be controlled at 10-16 cm when broadcasting.Conclusion The upright seedlings' growth status at different stages was better than the leaning seedlings and the laying seedlings,and significantly better than the laying seedlings.Increasing the rate of upright seedlings resulted in the high yield of broadcasted rice effectively.Under the conditions that the soil at the depth of top 5-6 cm was soft,the broadcasting seedlings were low and broadcasting height was from 3 to 4 m,it would have the best seedling standing.
【Fund】: 国家自然科学基金项目(30771273);; 农业科技跨越计划(2008跨10);; 国家“十一五”科技支撑计划重大项目(2006BAD02A03)
【CateGory Index】: S511
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