ISHS Acta Horticulturae 119: III International Symposium on Water supply and Irrigation in the open and under Protected Cultivation
EFFECT OF IRRIGATION REGIMEN ON YIELD AND WATER CONSUMPTION OF GREENHOUSE TOMATO GROWN IN LYSIMETERS |
| Authors: | F. Quaglietta Chiarandà, G. Zerbi |
| Abstract:
A set of 16 drainage lysimeters has been installed under a greenhouse; a couple, where meadow fescue (Festuca pratensis L.) was grown, has been used to measure the ETp; seven replicated irrigation regimens on tomato, cv. "Marglobe", were obtained in the other lysimeters, irrigating when evaporation from a "Class A Pan" in the greenhouse reached respectively the values of 10, 20, 30 …… 70 mm. Linear relations have been found between both marketable and total yield and seasonal evapotranspiration. Maximum evapotranspiration (545 mm) has been obtained when the plants were irrigated when 20 mm of "A" Pan evaporation were cumulated. Development expressed as dry matter of the whole plant was similarly related to total seasonal evapotranspiration. Crop coefficients with respect to ETp and to evaporimeters are reported; they appear higher than the correspondent values found in the literature for field conditions. The relationship between relative yield decrease (1 - Ya/Ym) and relative evapotranspiration (1 - ETa/ETm) at different stages of growth confirms the marked sensitivity of the crop during the vegetative and the flowering periods, with respect to the initial and the harvesting periods. | |
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