ISHS Acta Horticulturae 537: III International Symposium on Irrigation of Horticultural Crops
EFFECT OF DIFFERENT WATER SUPPLY ON WATER CONSUMPTION AND CANOPY TEMPERATURE OF CAULIFLOWER |
| Authors: | L. Helyes, Z. Pék, L. Szaóbo |
| Keywords: | Cauliflower, canopy temperature, water consumption |
| Abstract:
Department of Horticulture has been dealing with the research on water turnover and irrigation scheduling of vegetables for 40 years. Effect of different water supply to cabbage varieties - including cauliflower - has been examined since 1979. In the experiments, the unirrigated stands gave 8.6 t/ha yield, regularly irrigated ones gave 20,4 t/ha. In dry weather conditions, the curd of unirrigated cauliflower does not develop and cannot be sold because of stress caused by the lack of water. Signs of stress effects were evaluated with regular measurements during the crop cycle. Hourly transpiration in the breeding pots showed significant (4-5 times) differences during a few days between continuous and decreasing water re-filling. Decreasing transpiration effect of different water supply can be characterised properly with canopy temperature. In case of optimal and deficient water supply - using infrared remote thermometer - the canopy temperature indicates a difference of more than 10°C in breeding pots as well as in the field. Surface temperature of plant stand can be used well in detecting water stress as compared to the changes of air temperature, radiation and vapour content. | |
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