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ISHS Acta Horticulturae 537: III International Symposium on Irrigation of Horticultural Crops

DAILY WATER UPTAKE OF A TOMATO CROP GROWN BY NFT UNDER SEMI ARID CONDITIONS AS AFFECTED BY SOLAR RADIATION AND OTHER ENVIRONMENTAL FACTORS

Authors:   M.C. Salas, M. Urrestarazu, D. Valera
Keywords:   Tomato, day-period water uptake rate, soilless, cycle crop
Abstract:
Simple and precise method was used for measuring water uptake rates of tomato (Lycopersicon esculentum Mill.) plants grown by Nutrient Film Technique (NFT) in greenhouse condition. To optimise the irrigation, it is necessary to save water and fertilisers. It is also important to decrease the pollution of over fertilisation in protected productions. It is known that a relative proportion of water is strongly correlated with the solar radiation and another environmental parameters. Water uptake rates were different and showed three phases throughout the total daily uptake: two of them during the day (before and after midday) and another one at night. These results suggest that we must do a similar number of fertigation phases where each one has a different correlation between total solar radiation and water uptake. In practice, it is possible to suggest some recommendations of fertigation versus of a similar radiation for these different phases during the day.
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