| Effect of irrigation quota on agronomic trait and biomass of feeding sweet sorghum under condition of border irrigation with mulching |
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| DOI：10.7606/j.issn.1000-7601.2017.02.33 |
| Key Words: feeding sweet sorghum irrigation quota agronomic trait biomass border irrigation with mulching |
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| Abstract: |
| In order to explore the optimal irrigation quota and water-saving effect suitable for feeding sweet sorghum under condition of border irrigation with mulching, a field experiment was conducted to study the effect of the irrigation quota (2 400, 3 000, 3 600, 4 200, 4 800 m3·hm-2 respectively) on soil water content, agronomic trait and biomass. Results showed that soil water content within 0～100 cm soil layer first increased and then decreased in sweet sorghum growth period, and irrigation quota had significant effect on 0～100 cm soil moisture distribution at the 62th d after sowing. Irrigation quota which was less than 2 400 m3·hm-2 seriously affected the sweet sorghum growing (such as reducing plant height, enlarging stem stalk, decreasing accumulative dry matter). Sugar content of sweet sorghum stalk juice had a trend of increase with the decrease of irrigation quota. The increase of sweet sorghum biomass was attributed to factors such as plant height, LAI and numbers of stem nodes (R2=0.97, 0.81, 0.59 respectively). In conclusion, for water-saving and increasing the biomass, irrigation schedule with irrigation quota of 3 600 m3·hm-2 (irrigation frequency was 4 times) was thereby recommended as the optional practice to increase the biomass (25.29 t·hm-2) and WUE (5.76 kg·m-3) under condition of border irrigation with mulching. |
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