Determinação do coeficiente de cultura (Kc) do tabaco produzido em larga escala para as condições edafoclimáticas do oeste baiano

Abstract

The management of irrigation via climate seeks to accurately replace the water that was used by the action of evaporation and transpiration, thus ensuring the water content necessary for the plant to express its maximum productive potential. In tobacco cultivation, irrigation performed properly is one of the agricultural practices with a great impact on the development and productivity of the crop. Despite being the 4th largest Brazilian state in tobacco production, there is still a need for more accurate information on the behavior of the crop in the different edaphoclimatic scenarios of western Bahia. The objective of this work was to determine the Tobacco crop coefficient (Kc) for the cultivation conditions of western Bahia and to know the behavior of the crop in the different climatic scenarios of the region. The study was installed in two commercial production areas irrigated by center pivot on the Santa Colomba farm located in the municipality of Cocos. The reference evapotranspiration was (ETo) was estimated by the FAO Penman-Monteith method. Daily ETc was determined through soil water balance. The crop coefficients obtained for the climate scenario of the 1st semester were 0.78 for phase 1, 0.63 for phase 2, 0.68 for phase 3, 0.79 for phase 4 and 0.62 for phase 5. For the 2nd semester scenario, the coefficients found were: 0.60 for phase 1, 0.69 for phase 2, 0.70 for phase 3, 0.76 for phase 4 and 0.74 for phase 5. The results obtained resulted in reliable data for the adjustment of empirical methods for the management of irrigation via climate.