Chinese Journal OF Rice Science >
Effects of Interaction Between Irrigation Regimes and Nitrogen Rates on Rice Yield and Water and Nitrogen Use Efficiencies
Received date: 2017-04-28
Revised date: 2017-06-10
Online published: 2017-09-10
【Objective】In order to lay a scientific basis for high yield and high water and nitrogen use efficiencies in rice production, we estimated the effects of the interaction between the alternate wetting and drying (AWD) regime and different nitrogen rates on grain yield, water and nitrogen use efficiencies.【Method】The field experiments were conducted with two irrigation regimes, AWD and conventional irrigation (CI) and three N rates, 80 (low amount, LN), 160 (medium amount, MN) and 240 kg/hm2 (high amount, HN) in Fuyang, Zhejiang Province in 2015 and 2016. The local high-yielding rice cultivar Tianyouhuazhan (three-line indica hybrid combination) was used as experimental material. 【Result】There was an obvious interaction between irrigation regimes and N rates. When compared with CI regime, AWD could reduce redundant vegetative growth and control the number of rice tillers, improve the percentage of productive tillers by 8.1%–10.7%; increase the leaf area duration (LAD) and crop growth rate (CGR) from heading to maturity; increase root dry weight at a depth of 10-20 cm at heading by 24.4%–32.3%, and the root oxidation activity (ROA) during the re-watering period after heading; AWD could promote the remobilization of non-structural carbohydrates (NSC) in culms and sheaths for grain filling. The grain yield, water and nitrogen use efficiencies were the highest in the combination of AWD and MN due to the improved population quality and grain filling, and the combination of AWD and MN was the best water-nitrogen management model in this study. 【Conclusion】The aim of high grain yield and high water and nitrogen use efficiencies could be achieved through integrating AWD with the medium amount of nitrogen application in rice production.
Guang CHU, Tingting CHEN, Song CHEN, Chunmei XU, Danying WANG, Xiufu ZHANG . Effects of Interaction Between Irrigation Regimes and Nitrogen Rates on Rice Yield and Water and Nitrogen Use Efficiencies[J]. Chinese Journal OF Rice Science, 2017 , 31(5) : 513 -523 . DOI: 10.16819/j.1001-7216.2017.7048 513
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