Journal
ENGENHARIA AGRICOLA
Volume 35, Issue 6, Pages 1009-1018Publisher
SOC BRASIL ENGENHARIA AGRICOLA
DOI: 10.1590/1809-4430-Eng.Agric.v35n6p1009-1018/2015
Keywords
water-use efficiency; greenhouse; water depth
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An experiment was conducted in a greenhouse at the Federal University of Lavras cultivated with American lettuce, cv. Raider-Plus. The aim of this study was to evaluate the effects of irrigation water depths applied by drip pulses and of soil coverage on crop yields and efficiency of water use. The experimental design used was randomized blocks with eight treatments and three replications, totaling twenty-four plots. The treatments consisted of soil with and without coverage (double-sided white and black plastic) associated with four irrigation management levels. Irrigation management consisted in reposition of irrigation depths based on crop evapotranspiration (ETc) with D-1 - 100% of ETc, applied continuously (control), and D-2 - 100% of ETc, D-3 - 75% of ETc, and D-4-50% of ETc, applied by pulses. Irrigation by pulses consisted in splitting the depths into six irrigation pulses with intervals of fifty minutes of rest. It was observed that pulse irrigation saved 25% of water in treatment without mulching and 50% when plastic mulching was used, contributing substantially to improve irrigation water efficiency.
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