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Drip irrigation presents higher irrigation efficiency when compared to sprinkler irrigation. Proper system design and the use of pressure-compensating emitters plays an important role in irrigation uniformity and efficiency, directly affecting plant growth. This study evaluated the performance of pressure-compensating and non-compensating emitters and the effect of irrigation equipment in different okra varieties in the U.S. Virgin Islands. Experiments were performed in two seasons (Spring and Fall, 2016), and tested four irrigation equipment (“Toro Aqua-Traxx FC”, “Eurodrip Thinwall Classic”, “Jain Top Drip AS”, and “Netafim Dripnet PC”) and three varieties of okra (‘Clemson Spineless 80’, ‘Clemson Spineless’, and ‘Chant’), arranged on a complete randomized block design with three replications. Irrigation was performed based on reference evapotranspiration, measured daily using an automated weather station. Soil moisture, electrical conductivity and soil temperature were monitored using capacitance sensors. The irrigation equipment responses to increasing pressure were evaluated in the lab, on experimental modules using clean water and simulating three different slopes (leveled, uphill and downhill). Yield and leaf physiological parameters were influenced by season (P<0.05), while fruit morphological parameters and soluble solids content were variety-dependent (P<0.01). The pressure-compensating emitters maintained water flow within the range indicated by the manufacturers. The distribution uniformity decreased overtime in all equipment except “Netafim Dripnet PC” in Fall 2016. Irrigation equipment did not impact plant growth. The equipment should be selected based on price and irrigation efficiency.

Microirrigation Equipment for Okra Cultivation in the U.S. Virgin Islands