| Crop transpiration efficiency under different soil water conditions |
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| DOI：10.7606/j.issn.1000-7601.2010.06.08 |
| Key Words: wheat com sorghum millet transpiration efficiency water consumption harvest index |
| Author Name | Affiliation | | LI Yuxin | Key Laboratory of Agricultural Water Resources & Hebei Key Laboratory of Agricultural Water-Saving, Center for Agricultural Resources Research, Institule of Genetics and Developmenal Biology, CAS, Shijiazhuang，Hebei 050021, China
Graduate University of CAS, Beijing 100049， China | | SHI Changhai | Key Laboratory of Agricultural Water Resources & Hebei Key Laboratory of Agricultural Water-Saving, Center for Agricultural Resources Research, Institule of Genetics and Developmenal Biology, CAS, Shijiazhuang，Hebei 050021, China
Graduate University of CAS, Beijing 100049， China | | QIAO Yunzhou | Key Laboratory of Agricultural Water Resources & Hebei Key Laboratory of Agricultural Water-Saving, Center for Agricultural Resources Research, Institule of Genetics and Developmenal Biology, CAS, Shijiazhuang，Hebei 050021, China | | DONG Baodi | Key Laboratory of Agricultural Water Resources & Hebei Key Laboratory of Agricultural Water-Saving, Center for Agricultural Resources Research, Institule of Genetics and Developmenal Biology, CAS, Shijiazhuang，Hebei 050021, China | | ZHAI Hongmei | Department of Chemistry, Shjiazhuang Unitersty，Shijiazhuang, Hebei 050035，China | | LIU Mengyu | Key Laboratory of Agricultural Water Resources & Hebei Key Laboratory of Agricultural Water-Saving, Center for Agricultural Resources Research, Institule of Genetics and Developmenal Biology, CAS, Shijiazhuang，Hebei 050021, China |
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| Abstract: |
| Pot experiment was conducted to study the characteristics of biomass，water consumption, transpiration
efficiency(TE) and dry matter distribution of wheat, sorghum, corm, millet under 3 soil moisture conditions (L: 60%~
65% of field capacity; M: 70%~75% of field capacity; H: 80%~85% of field capacity) . The results showed that:With the decreasing of soil moisture, the crop biomass and water consumption reduced, plant TE increased. The TE in-creasing range of sorghum was 53. 6%，which was the largest among 4 crops. With the reduction of soil moisture, net photosynthetic rate and transpiration rate (Tr) became lower. Crop maintained a high leave TE(TEI) by a significant re-duction of Tr. TEI of crop showed a single peak trend change within growth stages , wheat and com reached the maximum at the flowering stage, while the TEI peak of millet and sorghum appeared in grainfilling stage and heading stage, re-spectively. Correlation analysis showed that TEy and harvest index (HI) was significantly positively related (wheat:R2=0.632，com:R2 =0.994, sorghum:R2 =0.920，millet: R2=0.949). There was a more reasonable dry matter distribution mechanism for millet in low soil moisture environment, while wheat could maintain higher HI and TEy in medium and low water environments, and it was not sensitive to soil moisture change and could grow in broader soil mois-ture conditions. |
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