LISÍMETROS DE LENÇOL FREÁTICO CONSTANTE PARA ESTIMATIVA DO COEFICIENTE DE CULTURA DO MILHO NO CERRADO

Abstract

Climate-based management is based on plant water consumption through the crop coefficient (Kc). The objective was to determine the initial, intermediate, and final crop coefficients (Kc) for NS 73 VIP 3 corn under Cerrado conditions. The work was continuous at the IF Goiano Campus Posse, using three constant water table lysimeters, each containing three plants, to obtain crop evapotranspiration (ETc). Reference evapotranspiration was calculated using the Penman-Monteith method, using climate data from the institution's meteorological station. The crop water demand was 904 mm, and the Kc values were 0.96 (Phase I), 1.34 (Phase II), and 1.27 (Phase III). The values obtained were different from those presented in the bulletin of the Food and Agriculture Organization of the United Nations, reinforcing the need to determine Kc values, due to the different locations, as climatic conditions vary from one place to another, thus impacting the values and water demand of crops.