Abstract
A 3-year study (1993–96) was recently completed evaluating the response of `Lisbon' lemons to various flood irrigation intervals. The irrigation intervals were based on soil moisture depletion (SMD), as calculated from frequent neutron probe soil moisture measurements at various depths. Individual treatments were irrigated when total SMD was 25%, 40%, 55%, and 70% respectively. Results obtained indicate that fruit growth was significantly reduced at the 70% SMD regime. In the first (ring) picks the most frequent (25% SMD) and the frequent (75% SMD) had reduced yields. Combined data from the three years indicated that early yields were maximized at the 40% SMD regime. Differences in fruit quality (peel thickness, percentage juice, solid/acid ratio, etc.) were not generally statistically significant at the 0.05 probability level.
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