Journal of Ecology and Rural Environment ›› 2019, Vol. 35 ›› Issue (7): 947-952.doi: 10.19741/j.issn.1673-4831.2018.0464

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Effects of Drip Irrigation Modes on Biomass Allocation, Yield and Water Use Efficiency of Sweet Corn in a Dry Hot Valley

LI Jian-cha1, LI Kun1, FANG Hai-dong1, ZHANG Lei2, PAN Zhi-xian1, YUE Xue-wen1, HE Guang-xiong1, DUAN Qi-cai2, SHI Liang-tao1   

  1. 1. Institute of Tropical Eco-agricultural Sciences, Yunnan Academy of Agricultural Sciences, Yuanmou 651300, China;
    2. Yunnan Institute of Water Resource and Hydropower Research, Kunming 650228, China
  • Received:2018-08-03 Online:2019-07-25 Published:2019-07-22

Abstract:

To investigate the effects of irrigation modes on biomass,biomass allocation,corn yield and water use efficiency of sweet corn,a field experiment including full drip irrigation without plastic film (T1),full drip irrigation under plastic film (T2) and drip irrigation with limited soil moisture under plastic film (T3) was conducted. The results show that irrigation modes had no significant effects on the biomass of sweet corn,but affected the allometric scaling relationships between different organs. The scaling exponents of stem mass vs total plant mass and leaf mass vs total plant mass for T3 were lower than those for T2 and T1. The scaling exponents of root mass vs total plant mass for T1 were lower than those for T2 and T3. The vegetative organ were isometric with the reproductive organ for T2 and T3,indicating that the growth rate of reproductive organs was proportional to the growth rate of vegetative organs. The scaling exponents of vegetative organ vs. reproductive organ for T1 was lower than 1,indicating that the growth rate of reproductive organs scaled allometrically with the growth rate of vegetative organs. The scaling exponents of underground vs. aboveground biomass for T1 were lower than for T2 and T3. Drip irrigation under plastic film increased the allocation biomass toward stem,leaf, aboveground and reproductive organ compared to the other treatments. Under the equivalent production,T2 and T3 saved water by 26% and 44%,and improved water use efficiency by 0.65 and 1.43 kg·m-3 compared to T1,respectively. Drip irrigation with limited soil moisture under plastic film (the lower limit of relative soil water content is 70%, the upper limit is 90%) is a water-saving and efficient irrigation mode of sweet corn in Yuanmou dry hot valley.

Key words: irrigation pattern, dry hot valley, biomass allocation, water use efficiency

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