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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Effect of simulated flash flooding on rice and its recovery after flooding with nutrient management strategies
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Effect of simulated flash flooding on rice and its recovery after flooding with nutrient management strategies

机译：营养管理策略模拟洪水对水稻的影响及其淹水后的恢复。

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Rice grown in flood-prone areas must have submergence tolerance characteristics either through varietal selection or by management options like nutrient application. This study is conducted to investigate the effect of application methods of nitrogen and phosphorus on submerged rice productivity and nutrient absorption. The effect of basal phosphorus and post-flood nitrogen (six different nutrient schedules) on the performance of Sub1 (IR-64 Sub1 and Swarna Sub1) and non-Sub1 (IR-20) cultivars of rice was tested under clear and turbid water submergence for their tolerance to submergence. Photosynthesis, yield and N concentration of rice subjected to complete submergence for 15 days was decreased significantly over non-submerged rice plants. Turbid water submergence was fatal in terms of photosynthesis, stomatal conductance, effective tillers and yield because of low light and dissolved oxygen underwater. Rice plants fertilized with P tolerated flooding better and produced significantly higher grain yields than no P application. The crop fertilized with N produced more number of effective tillers and grain yield than the unfertilized crop under complete submergence at maximum tillering (MT) stage. When post-flood N was applied alone, grain yield was 25.8, 17.8 and 17.1% lower in IR-20, IR-64 Sub1 and Swarna Sub1, respectively, as compared to N and basal P application. Urea foliar spray after desubmergence significantly enhanced the photosynthesis and narrowed down the flowering time which led to higher grain yield and productivity. The findings of the study suggest that a simple alteration in the time and method of N application with basal P can significantly contribute to higher rice yield in flash-flood prone areas. (C)2015 Elsevier B.V. All rights reserved.
机译：在易发洪水地区种植的水稻必须具有通过品种选择或通过诸如养分施用等管理选择而具有的耐淹水特性。本研究旨在探讨氮磷施用方式对淹没水稻生产力和养分吸收的影响。在清水和浑水浸没的情况下，测试了基础磷和洪水后氮素（六个不同的养分方案）对水稻Sub1（IR-64 Sub1和Swarna Sub1）和非Sub1（IR-20）品种的性能的影响忍受淹没完全淹没15天的水稻的光合作用，产量和氮浓度比未淹没的水稻植株显着降低。由于光线不足和水下溶解氧，混浊的水淹没在光合作用，气孔导度，有效的分till和产量方面是致命的。与不施用磷肥相比，施用磷肥的水稻植株对洪水的耐受性更好，且谷物产量明显更高。在最大分ing期完全淹没的情况下，施氮的农作物比未施肥的农作物产生更多的有效分till和谷物产量。单独施用淹水后的氮肥，与施用氮肥和基础磷肥相比，IR-20，IR-64 Sub1和Swarna Sub1的籽粒产量分别降低25.8％，17.8％和17.1％。淹没后的尿素​​叶面喷洒显着增强了光合作用，缩短了开花时间，从而提高了谷物的产量和生产力。该研究的发现表明，在容易发生洪灾的地区，简单地改变基础磷施氮的时间和方法可以显着提高水稻产量。 （C）2015 Elsevier B.V.保留所有权利。

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