期刊论文

Nitrogen Rate and Planning Mode Affect Yield and Nitrogen Utilization Efficiency of Early Rice in Southern Hunan

中文

中国农学通报

1000-6850

2019

35

11

72-81

国家自然科学基金“土壤酸化对双季稻氮素利用效率的影响机制研究”（31171494）； 国家重点研发计划“粮食丰产增效科技创新”重点专项（2017YFD0301500）； 农业部行业计划项目“湘东三熟区稻田培肥及农作制优化集成研究与示范”（201503123-05）；

本校为第一机构

为改进湘南地区早稻氮肥施用方法,明确氮肥施用关键技术,构建高产高效氮肥施用模式,开展了以施氮水平为主区因素、氮肥运筹方式为副区因素的裂区试验,研究了其对湘南早稻产量形成与氮素利用效率的影响。结果表明:(1)增大施氮量和穗粒肥比例能提高早稻茎蘖数和成熟期水稻叶片SPAD值;施氮150~210 kg/hm~2范围内,早稻产量变化不大,但中氮(180 kg/hm~2)水平下提高穗粒肥比例可显著增产。(2)增大施氮量可显著提高稻米整精米率和稻米粗蛋白含量,降低垩白率;提高穗粒肥比例可提高稻米整精米率、直链淀粉含量和粗蛋白含量,降低稻米碱消值。(3)随施氮量增大,早稻氮素积累量显著增大,但氮素偏生产力(NPFP)...

To improve the nitrogen application methods to early rice in southern Hunan,clarify the key application techniques and construct a high-yield and high-efficiency application mode,a two-factor splitplot experiment with the application rate as main factor and the fertilizer planning mode as secondary factor was conducted and its impact on yield formation and nitrogen utilization efficiency was studied.The results showed that:(1)tiller number and leaf SAPD value at maturity stage of early rice increased with the increase of nitrogen fertilizer rate and ratio of ear and grain nitrogen,the yield ha...