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Acta Agron Sin ›› 2016, Vol. 42 ›› Issue (11): 1666-1676.

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effect of Nitrogen Application Regime on Yield,Nitrogen Absorptionand Utilization of Mechanical Pot-Seedling Transplanting Rice with GoodT aste Quality

HU Qun1, XIA Min1, ZHANG Hong-Cheng1,*, CAO Li-Qiang1, GUO Bao-Wei1, WEI Hai-Yan1, CHEN Hou-Cun2, DAI Qi-Gen1, HUO Zhong-Yang1, XU Ke1, LIN Chang-Ming2, and HAN Bao-Fu3   

  1. 1 Innovation Center of Rice Cultivation Technology in Yangtze Valley, Ministry of Agriculture / Jiangsu Province Key Laboratory of Crop Genetics and Physiology, Yangzhou 225009, China; 2 Crop Cultivation Technology Guidence Station, Hai’an County, Hai’an 226600, China; 3 Nantong Kumho Ecological Agriculture Development Co., Ltd, Hai’an 226600, China
  • Received:2016-02-05 Revised:2016-07-11 Online:2016-11-12 Published:2016-08-11
  • Contact: 张洪程,E-mail:hczhang@yzu.edu.cn
  • Supported by:

    ThisworkwasfinancedbytheAgriculturalIndependentInnovationFundofJiangsuProvince(CX[15]1002),ThreeNewAgricultureProjectofJiangsuProvince(SXGC[2015]325),NationalNonprofitIndustry-specific(201040005),andImportantResearchandDevelopmentProgramsofJiangsuProvince(BE2015340,BE2016351).

Abstract:

In recent years, the planting area of good taste quality rice in the Yangtze River region is continuously expanded. With developing the new matching technology of mechanical pot-seedling transplanting rice, the yield and efficiency of good taste quality rice were increased significantly. Nitrogen fertilizer plays a major role in rice production. Two representative rice cultivars with good taste quality grown in Jiangsu, named Nanjing9108 and Nanjing5055, were adopted in this study. The total amount of nitrogen applied in each treatment was 270 kg ha-1 with different ratio of basal-tillering-fertilizer to panicle-fertilizer, including 10:0, 9:1, 8:2, 7:3, 6:4, 5:5, and 4:6. The effects of the nitrogen application strategies on yield and its components, stems and tillers dynamic, leaf area index(LAI), dry matter accumulation, and nitrogen use efficiency of rice were studied and the best method of nitrogen application was also accessed. It was found that the treatment with the ratio of basal-tillering-fertilizer to panicle-fertilizer of 6:4 had the highest yield, due to its higher spikelets per panicle based on more and stable panicle number, higher seed setting rate and 1000-gain weight than these of other treatments. The population number of stems and tillers gradually reduced with the ratio of basal-tillering fertilizer decreased and gently decreased after jointing stage in the treatments with more panicle-fertilizer. The percentage of productive tillers decreased with the ratio of panicle-fertilizer increased. During the middle and late growth stages, the treatment of 6:4 had significantly larger LAI and higher dry matter accumulation. The treatment of 6:4 had a litter nitrogen accumulation before jointing, but higher nitrogen accumulation after jointing and higher total nitrogen accumulation at mature stage than other treatments. Apparent nitrogen use efficiency, physiological nitrogen use efficiency, agronomic nitrogen use efficiency and partial factor productivity of applied nitrogen were higher in treatment of 6:4 than in other treatments too. In general, the treatment with the ratio of basal-tillering-fertilizer to panicle-fertilizer of 6:4 is conducive to get suitable panicle number, large spike, increased filled-grain percentage and 1000-grain weight, coordinative yield components and optimized population quality, which is the best nitrogen application regime for mechanical pot-seedling transplanting rice with good taste quality to achieve mutual unity of high yield and high nitrogen use efficiency.

Key words: Nitrogen application, Mechanical transplanting with pot seedling, Good taste quality rice, Yield, Nitrogen absorption and utilization

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