Irrigation of eggplants grown in heated greenhouses

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Abstract
The potential evapotranspiration (ETP) of eggplants grown in heated greenhouses was measured over the growing seasons 1988-9 and 1989-90 using plants grown in drainage lysimeters. The crop ETP in November (at planting) was 0.2 of the evaporation from a United States Weather Bureau Class A screened pan (Epan) located outside the greenhouse and this value increased gradually to 0.90 x Epan at the conclusion of the experiment in May. Crop ETP ranged from 0.5 to 6.5 mm day-1 with a whole-season irrigation requirement corresponding to 565 mm. Total yield in both years exceeded 100 tons ha-1 with amounts of water ranging between 0.75 and 1.25 X ETP and only in the first year did water application at 0.5 x ETP reduce yield significantly. Salts were leached out of the root-zone below drippers with all the amounts of added water tested, and were mainly concentrated on the surface 15 cm soil layer half way between drippers on the lateral and between lateral lines.

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