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| Experimental study on irrigation quota of two crops harvesting feeding sweet sorghum |
| WANG Zengli, DONG Pingguo, HAN Wanhai |
| State Key Experimental Station for Efficient Irrigation Water Use in Wuwei City, Wuwei, Gansu 733000, China |
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Abstract In order to explore the optimal irrigation quota and water-saving effect suitable for feeding sweet sorghum, a field experiments was conducted to study the effect of the irrigation quota(2 400, 3 000, 3 600, 4 200, 4 800 m3/hm2respectively)on growth and biomass of two crops of feeding sweet sorghum. Results showed that the peak of stems diameter and plant height of sweet sorghum appeared respectively at 62th days and 158th d after sowing. Plant height increased with increasing irrigation quota, while stems diameter had a reducing with increasing irrigation quota. Daily growth rate of sweet sorghum appeared at 76th days after sowing was the biggest, which were between 4.00-4.89 cm/d. With different irrigation quota, fresh or dry biomass of sweet sorghum was 63.9-115.5 t/hm2 and 12.7-21.4 t/hm2 respectively, water consumption of that in the whole growth stage was 326.95-504.24 mm, WUE of fresh and dry biomass was 15.53-24.63 kg/m3 and 3.89-4.51 kg/m3 respectively. When irrigation quota was 4 200 m3/hm2, Fresh or dry biomass of two crops of sweet sorghum were all the biggest, and no significant increase was achieved by adding irrigation quota. In conclusion, for water-saving and increasing the biomass, irrigation schedule with irrigation quota of 4 200 m3/hm2(irrigation frequency was 4 times)was thereby recommended as an optimized irrigation to increase the biomass of two crops of feeding sweet sorghum.
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Received: 18 July 2016
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