LÂMINAS DE IRRIGAÇÃO NA CULTURA DA RÚCULA NA REGIÃO DO CERRADO

Abstract

Arugula (Eruca sativa Mill.) is a leafy herbaceous plant of fast growing vegetative and short cycle of 30 to 40 days. The literature on the agronomic performance of irrigated vegetables in Cerrado (Savannah) of Goiás State, Brazil, is scarce and is based on empirical experiments carried out by producers, lacking research results as a reference. This study aimed to evaluate the vegetative development and the arugula cultivars production under different irrigation depths in the drip system, under protected environmental conditions in the Brazilian Cerrado (Savannah). The experiment was carried out in a greenhouse in the experimental area located at the Goiano Federal Institute, Ceres Campus, in the periods of September/October and November/December 2017. The experimental design was a randomized block with 3x4 subplots (3 arugula cultivars and 4 irrigation depths, according to reference evapotranspiration (ET0) tank Class "A": 55, 70, 85, and 100%) and three replicates, totaling 108 vessels. For the experiment deployed in September, the harvest took place on October 25, and for the experiment deployed in November, the harvest was on December 12. The irrigation system used was the drip irrigation system. Irrigation management was carried out according to the tank method class "A". The temperature (ºC) and the air relative humidity (%) were monitored daily with a digital thermohygrometer in a protected place inside the greenhouse. Monitoring of ET0 (mm day-1 ) was done by the reading in the tank class "A". The variables analyzed were: (a) plant height; (b) number of leaves; (c) green mass per plant; (d) average leaf mass; (e) green mass of the packet; (f) productivity; (g) SPAD index; and (h) water use efficiency. For the arugula plants development, there was a significant difference for the SPAD index in the November/December experiment, and there was a significant difference for the plant height in the September/October experiment. There was a difference in the efficiency of water use for the experiment of November/December. There was no difference for the productivity in the treatments studied. The three arugula cultivars can be recommended for irrigated production under protected environment in the Cerrado region with 55% Crop evapotranspiration (ETc).