Tuber yield of Jerusalem artichoke (Helianthus tuberosus L.) in relation to water stress
Jerusalem artichoke (Helianthus tuberosus L.) is a crop grown for its inulin rich tubers. Fructose obtained from the tubers may be used as a sweetening agent or as a source of alcohol. As this crop is not widespread, many details about its culture are not known. The present study deals with the water requirements for optimum yield, specially at different growth stages. Field experiments were performed for two years with cultivar "Nahodka". The treatment in which the plants did not suffer any water limitation yielded about 80t ha-1 fresh weight per year (about l6 t ha-1 dry weight). This implied approximately 1000 dm3 m-2 of irrigation water. Results show that, in the last growth stage, the relative yield deficit was highly affected by the relative evapotranspiration deficit. The relative evapotranspiration was lower than 90% when the plant available water decreased under 25%. The crop showed a certain acclimation to water stress, decreasing the yield only 20% when optimum irrigation was reduced to 50%, and was evenly supplied along the year. © 1991.
| Main Authors: | , , , |
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| Format: | journal article biblioteca |
| Language: | English |
| Published: |
Elsevier
1991
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| Subjects: | Jerusalem artichoke, Tuber yield, Inulin, Fructose, Alcohol, Evapotranspiration, Water needs irrigation, Water stress, |
| Online Access: | http://hdl.handle.net/20.500.12792/4997 http://hdl.handle.net/10261/294850 |
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| Summary: | Jerusalem artichoke (Helianthus tuberosus L.) is a crop grown for its inulin rich tubers. Fructose obtained from the tubers may be used as a sweetening agent or as a source of alcohol. As this crop is not widespread, many details about its culture are not known. The present study deals with the water requirements for optimum yield, specially at different growth stages. Field experiments were performed for two years with cultivar "Nahodka". The treatment in which the plants did not suffer any water limitation yielded about 80t ha-1 fresh weight per year (about l6 t ha-1 dry weight). This implied approximately 1000 dm3 m-2 of irrigation water. Results show that, in the last growth stage, the relative yield deficit was highly affected by the relative evapotranspiration deficit. The relative evapotranspiration was lower than 90% when the plant available water decreased under 25%. The crop showed a certain acclimation to water stress, decreasing the yield only 20% when optimum irrigation was reduced to 50%, and was evenly supplied along the year. © 1991. |
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