| Effects of stubble height of spring wheat on biomass and water use efficiency of green manure on Qinghai Plateau |
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| DOI：10.7606/j.issn.1000-7601.2020.06.19 |
| Key Words: spring wheat multiple cropping green manure stubble height green manure biomass water use efficiency Qinghai Plateau |
| Author Name | Affiliation | | LI Fei | College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai 810016, China | | SONG Mingdan | Academy of Agriculture and Forestry, Qinghai University, Xining, Qinghai 810016, China | | JIANG Fuzhen | Academy of Agriculture and Forestry, Qinghai University, Xining, Qinghai 810016, China | | HAN Mei | Academy of Agriculture and Forestry, Qinghai University, Xining, Qinghai 810016, China | | YAN Qingbiao | Academy of Agriculture and Forestry, Qinghai University, Xining, Qinghai 810016, China | | LI Zhengpeng | Academy of Agriculture and Forestry, Qinghai University, Xining, Qinghai 810016, China |
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| Abstract: |
| In view of the long leisure period after wheat and low utilization efficiency of light and hot water resources on Qinghai Plateau, a field experiment of multiple green manure crops with different stubble heights (0, 20 cm, and 40 cm) following wheat harvest was set up in 2019 to study its effects on biomass, leaf area index (LAI), and water use efficiency (WUE) of two multiple cropping green manure, namely Common vetch and Hairy vetch. The results showed that the total dry matter mass of green manure decreased with the increase of stubble height, and the total dry matter mass at 0, 20 cm, and 40 cm after stubble was 5 756.45, 4 046.09 kg·hm-2, and 3 534.09 kg·hm-2, respectively. The weight of Common vetch was 3 462.69, 2 642.75 kg·hm-2, and 2 011.34 kg·hm-2, respectively. Root\|shoot ratio increased with increasing stubble height. Root\|shoot ratio increased from 0.043 to 0.057 and 0.047 at 0, 20 cm, and 40 cm, respectively, after stubble of Hairy vetch, and from 0.07 to 0.08 and 0.083, respectively. The root\|shoot ratio of Hairy vetch was significantly higher than that of Common vetch by 59.2%. The dry weight and LAI of each organ in green manure decreased with increasing stubble height, among which LAI of Common vetch decreased from 1.72 to 1.34 and 0.95, and that of Hairy vetch decreased from 1.00 to 0.77 and 0.59. The ratio of stem to leaf increased with increasing stubble height, and ratio of stem to leaf was 0.78, 0.89, and 0.99, and that of Hairy vetch was 0.82, 0.84, and 0.86 for all 3 depths, respectively. The stem dry weight, leaf dry weight, stem\|leaf ratio, and LAI of Common vetch were significantly higher than those of Hairy vetch by 141.1%,135.4%,6.0% and 69.6%, respectively. The WUE of the two green manure decreased with increasing stubble height, and the dry matter quality and WUE of common vetch were significantly higher than those of Hairy vetch by 62.2% and 60.0%, respectively. The treatment of no stubble and multiple cropping common vetch after wheat had the highest biomass and water use efficiency, and made full use of the light and hot water resources during the leisure period after wheat, it is the recommended green manure model for multiple cropping after wheat in this study. |
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