Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (10): 1904-1913.doi: 10.3864/j.issn.0578-1752.2012.10.003

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Research on the Mechanism of Grain Yield Increase of Rice by Quantitative Intensifying and Controlling Cultivation Under an  Erect Ecology in Yunnan Province of China

 YANG  Cong-Dang, LI  Gang-Hua, LI  Gui-Yong, XIA  Qiong-Mei, DENG  An-Feng, LIU  Zheng-Hui, WANG  Shao-Hua, LING  Qi-Hong, DING  Yan-Feng   

  1. 1.南京农业大学农学院/农业部作物生理生态与生产管理重点实验室，南京 210095
    2.云南省农业科学院粮食作物研究所，昆明 650205
  • Received:2011-12-05 Online:2012-05-15 Published:2012-02-29

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Abstract: 【Objective】In order to research the mechanism of grain yield increase of rice by Quantitative Intensifying & Controlling Cultivation (RQICC, RP), which is a new cultivation for grain yield increase by less cost, in Yunnan Province, where there is an erect ecology, and divided into 6 environments for rice production. 【Method】 Field experiments were carried out in areas where the elevations are 750 and 2700 m above the sea level in Yunnan Province in 2008 and 2009. The contrast tests between RP and conventional cultivation of the main rice varieties, whose covering area was more than 1000 hm2 in the county, were carried out in six environments. The leaf age and tiller number were counted per week after transplanting. And the grain yield and its components were measured at mature stage. 【Result】 Grain yield increased by 16.0% and 15.8% for Indica and Japonica by RP in 2008, respectively, and by 18.3% and 15.3% in 2009, respectively. More spikelet per m2 was the main factor for grain yield increase as the number of panicle per m2 or number of spikelet per panicle increased by RP cultivation. And there was no difference in seed setting rate and grain weight between two cultivations. The crop population values of 12 t?hm-2 grain yield rice under different environments were listed. 【Conclusion】 Enough spikelet per m2 land was the base of high grain yield rice under different environments. This is a right way to increase grain yield by increasing spikelet number per m2, through increasing panicle-maximum tiller rate and using more nitrogen as panicle fertilize to initiate and keep more spikelet.

Key words: rice, erect ecology, RQICC, increased grain yield

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