| Cite this article: | 蔡晓,吴祥运,王东,等.水氮互作对滴灌夏玉米生长及水分利用的影响[J].灌溉排水学报,0,():-. |
| CAI Xiao,WU Xiangyun,WANG Dong,et al.水氮互作对滴灌夏玉米生长及水分利用的影响[J].灌溉排水学报,0,():-. |
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| Effects of water and nitrogen interaction on crop growth and water utilization of summer maize under drip irrigation |
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CAI Xiao1, WU Xiangyun1, WANG Dong2, LIN Xiang2, ZHANG Junpeng1
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1.College of Water Conservancy and Civil Engineering,Shandong Agricultural University;2.College of Agriculture,Shandong Agricultural University
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| Abstract: |
| 【Objective】 To reduce the amount of irrigation water and fertilizer application under high yield condition of maize.【Methods】Two-year field experiment were conducted to investigate effects of various combinations of supplementary irrigation and nitrogen (N) application on leaf area index (LAI), aboveground biomass, yield components, evapotranspiration and water use efficiency (WUE) of summer maize with drip irrigation. In 2018, three irrigation treatments (W20, W30, W40) and three N treatments (180, 240, 300 kg/hm2, denoted as N180, N240, and N300, respectively) were applied. In 2019, add one irrigation treatment (W10) and one N treatment (N120) on the previous basis. Among them, the irrigation water amount was calculated from the soil water content in 0-10 (W10), 0-20 (W20), 0-30 (W30) and 0-40 cm (W40) soil layer, the target soil water content at the corresponding soil depth after irrigation was field water capacity. The period of N application was the same as irrigation.【Results】LAI and aboveground biomass increased with the increase of irrigation and N application rate, but there was no significant difference between N240 and N300. The effect of N application on seed yield of summer maize was greater than that of irrigation and water-N interaction. In 2018, only W20N180 yield was significantly lower than W40N300. In 2019, the yield of all treatments under W10 and N120 treatments under W20, W30 and W40 were significantly lower than W40N300. Both the amount of irrigation water and N application had significant effects on evapotranspiration, which increased with the increase of the amount of N and irrigation water applied. Irrigation had a significant impact on WUE. In 2018, the average value of WUE in W20 and W30 increased by 11.05% and 1.74% respectively, compared with that in W40, which increased by 17.94%, 9.11% and 7.21% for W10, W20 and W30 treatments in 2019. 【Conclusion】 Considering the irrigation water amount, N application, grain yield and WUE, it is suggested that water and fertilizer application scheme of summer maize under drip irrigation in the area should be as following: The periods of supplementary irrigation and N application were both sowing, jointing and tasseling. The soil depth of supplementary irrigation was 0-20 cm, and the upper limit of irrigation was the field water capacity. The amount of N application was 180~240kg /hm2, and sowing N: jointing N: tasseling N was 1:1:1. Among them, sowing N was applied in basal, and jointing N and tasseling N were dissolved in water and then injected into drip irrigation system. |
| Key words: summer maize; supplementary irrigation with drip irrigation; water-nitrogen interaction; yield; water use efficiency. |
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