Consumo hídrico do manjericão por meio de lisímetro de drenagem

Abstract

Evaluation of water requirement and crop coefficient is of great importance for an appropriate irrigation management. However, there has been lack of information on Basil crop. The aim of this study was to evaluate water consumption of the basil crop and estimate its crop coefficient (Kc), relating it to the sum of degree days (DD) and the vegetation index (VI). A total of three drainage lysimeters were used, crop evapotranspiration (Etc) in mm d-1 was determined by inputs and outputs of water; reference evapotranspiration (ETo) in mm d-1 was estimated by the Penman-Monteith method, recommended by FAO-56. Water consumption of the crop was 70.91 mm, 103 mm and 187 mm, which corresponds to mean values of 1.03; 1.84 and 3.07 mm d-1 in the cultivation periods I, II and III, respectively. Variations in Kc values were observed as a result of the climate conditions and phonological stages of the crop. Maximum and minimum Kc values were 0.37-0.23; 0.60-0.27; 1.00-0.38 and 1.15-0.82 for the I, II, III and IV phonological stages, respectively. The estimate of Kc as a function of DD and VI was highly significant for the crop in the three cultivation periods.