Irrigação por gotejamento na cultura da cenoura : manejo e custos de produção

Abstract

Aim of this study to evaluate the effect of different soil-water tensions on production of two carrot cultivars drip irrigated, as well as to check the economic viability of this irrigation system in carrot culture. Experiment was conducted in experimental area of Departamento de Engenharia of the Universidade Federal de Lavras (UFLA), in period of June to October of 2010. Experimental design was in randomized blocks, in factorial scheme 2 x 6, with 4 repetitions. Treatments were constituted of two carrot cultivars, hybrid Nayarit F1 and not hybrid Nantes, and six soil-water tensions,15, 25, 35, 45, 60 and, 75 kPa. Therefore, hybrid cultivar (Nayarit F1) presented better responses in relation to analyzed characteristics: yield of commercial roots, medium mass of commercial roots, and total soluble solids in both cultivars. Aiming higher commercial root yield, greater percentage of roots of class 14 and 18, and higher medium mass of commercial roots is indicated to irrigate in moment that soil- water tension is about 15 kpa in profundity of 0.15 m. Total medium costs were inversely proportional to profundities obtained of treatments of soil-water tensions, and this result indicates response to production scale. The drip irrigation in carrot culture is adequate in soil-water tensions between 15 to 35 kPa, and in cultivars studded is viable economically.