| Effects of different irrigation quantities at key growth stages on yield, quality and water use efficiency of sweet sorghum |
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| DOI：10.7606/j.issn.1000-7601.2019.04.07 |
| Key Words: sweet sorghum irrigation amount biomass yield soluble sugar content ethanol yield water use efficiency |
| Author Name | Affiliation | | XIE Ting-ting | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SHAN Li-shan | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SU Pei-xi | Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Ecological and Environmental Resources Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China | | ZHAO Wen-zhi | Linze Inland River Basin Research Station/Key Laboratory of Ecohydrology of Inland River Basin, Northwest Ecological and Environmental Resources Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China |
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| Abstract: |
| By fixing the same amount of total irrigation for sweet sorghum throughout growth season in desert oasis region of Hexi corridor, with equal amount of water during every irrigation (CK) as control, two treatments including 1) increasing 20% of water in jointing stage-flagging stage and decreasing 20% of water in flowering-maturing stage, 2) increasing 40% of water in jointing stage-flagging stage and decreasing 40% of water in flowering-maturing stage, were set up. We studied the effect of variation in the irrigation quantity in key growth stages on the growth parameters, yield, quality, and water use efficiency. The aim was to provide the best water saving irrigation technology, which could be beneficial for increasing productivity and water use of sweet sorghum in the arid region. The results showed that compared with CK, the plant height and stem diameter were all increased and the stem diameter was significantly enhanced by increasing irrigation amount in jointing-booting stage and flowering-maturing stage. The stem and aboveground biomass yield were also significantly enhanced under regulated deficit irrigation, and reached the highest values of 72.89 t·hm-2and 89.04 t·hm-2, respectively, with 1 050 m3·hm-2 of irrigation water each time in jointing-booting stage and 450 m3·hm-2 of irrigation amount each time in flowering-maturing stage; The sugar yield and ethanol yield also achieved the highest in this treatment with the value of 12.47 t·hm-2 and 6 842.47 L·hm-2, respectively. Meanwhile, water use efficiency was increased with increasing irrigation amount in jointing stage-flagging stage and decreasing irrigation amount in flowering-maturing stage. This showed combination of increasing irrigation water by 40% in jointing stage-flagging stage and decreasing irrigation water by 40% in flowering-maturing stage enhanced biomass yield and quality of sweet sorghum without increasing total irrigation water usage, it also improved water use efficiency. |
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