| 水氮耦合对冬小麦根系分布和根冠比及产量的影响 |
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| 引用本文： | 武荣,李援农.水氮耦合对冬小麦根系分布和根冠比及产量的影响[J].广西农业科学,2013(6):963-967. |
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| 作者姓名： | 武荣 李援农 |
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| 作者单位： | [1]西北农林科技大学旱区农业水土工程教育部重点实验室,陕西杨凌712100 [2]杨凌职业技术学院,陕西杨凌712100 |
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| 基金项目： | 国家“863”计划项目（2011AA1005A4）; 杨凌职业技术学院青年教师科研项目（20120612） |
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| 摘 要： | 【目的】研究膜下沟灌水氮耦合对冬小麦根系分布、根冠比及产量的影响,为冬小麦生产提供理论依据。【方法】以冬小麦为试材进行田间试验,设1500、3000m3/ha两个灌水水平和75、150和300kg/ha3个施氮水平,测定不同处理组合冬小麦根部特征及产量。【结果】冬小麦根系随着土层深度增加,根长密度呈指数下降;灌水量相同时,适当增加施氮量能促进冬小麦根系生长,但施氮量过高时又会抑制冬小麦根系生长。施氮量相同时,增加灌水量会显著抑制冬小麦根系生长。冬小麦产量随灌水量的增加而增加,而冬小麦根冠比随灌水量的增加而减少。冬小麦产量与根冠比之间呈一元二次显著性相关。【结论】冬小麦产量与根冠比呈一元二次显著相关,3000m3/ha灌水量和150kg/ha施氮量为较优的灌溉施氮方式。
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| 关 键 词： | 冬小麦 施氮量 灌水量 根系分布 根冠比 产量 |
Effect of water and nitrogen fertilizer coupling on root distribution, root/shoot ratio and yield of winter wheat |
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| WU Rong,LI Yuan-nong.Effect of water and nitrogen fertilizer coupling on root distribution, root/shoot ratio and yield of winter wheat[J].Guangxi Agricultural Sciences,2013(6):963-967. |
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| Authors: | WU Rong LI Yuan-nong |
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| Institution: | 1 Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas,Ministry of Education,Northwest A＆F University,Yangling,Shaanxi 712100 ,China; 2 Yangling Vocational and Technical College, Yangling,Shaanxi 712100 ,China) |
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| Abstract: | Objective The effect of water and nitrogen fertilizer coupling with furrow irrigation under plastic film on root distribution, root/shoot ratio and yield of winter wheat was studied to provide references for winter wheat production. Method Two irrigation levels of 1500 m3 /ha and 3000 m3 /ha and three nitrogen fertilizer level of 75,150 and 300 kg/ha were designed in this experiment to test root trait and yield of winter wheat in different treatments. ResultWith the increase of soil depth, the amount of roots rose but root length density decreased exponentially. Under the same level of irrigation, proper increase of nitro-gen fertilizer would significantly promote the growth of roots, however excessive nitrogen fertilizer inhibited root growth. Under the same level of nitrogen fertilizer, as the level of irrigation rose, the yield of winter wheat increased and the growth of root was promoted while its root/shoot ratio declined. The yield and root-shoot ratio had significant correlation and accorded with quadratic function. Conclusion The yield and root-shoot ratio had significant correlation and accorded with quadratic function. It is concluded that the 3000 m3 /ha irrigation and 150 kg/ha nitrogen was the optimal fashion. |
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| Keywords: | winter wheat nitrogen fertilizer irrigation roots distribution root/shoot ratio yield |
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