Effects of Different Water-Saving Irrigation Modes on Growth,Yield,and Water Utilization of Summer Maize
In order to better understand the potential of increasing yield of traditional and novel water-saving irrigation technologies,the effects of different irrigation modes on growth,yield and water utilization of summer maize were compared and analyzed under the same total irrigation amount.Under rain-proof shelter controlled precipitation conditions,four water-saving irrigation modes were set up,namely furrow irrigation(FI),surface drip irrigation(DI),subsurface drip irrigation(SDI)and moistube-irrigation(MI).The findings demonstrated that,in contrast to FI and DI treatments,SDI and MI treatments decreased the soil water content in the 0-40 cm soil layer and increased it in the 40-100 cm soil layer.Although the leaf area index and aboveground biomass of summer maize declined during the jointing stage,they increased throughout the silking and filling stages,and reduced the decline after silking,ultimately achieving higher aboveground biomass and yield.Compared with FI treatment,aboveground biomass and yield of SDI and MI treatments at maturity stage were significantly increased by 13.43％and 9.65％,and the yields were significant increased by 22.15％and 15.61％,respectively.The water use efficiency of SDI and MI treatments were significantly increased,compared with FI and DI treatments,due to the reduction of soil evaporation and soil water storage consumption,and resulting in lower evapotranspiration.In sum,compared with FI and DI treatments,SDI and MI treatments can reduce soil evaporation,improve soil water conditions in the middle and lower layers,delay the senescence of plant leaves after silking,facilitate post-silking photosynthetic production,and improve water use efficiency and yield of summer maize.
Summer maizeWater saving irrigation modesSubsurface drip irrigationMoistube-irrigationLeaf area indexYieldWater use efficiency
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