Efeito de diferentes tensões de umidade do solo sobre a cultura da cenoura (Daucus carota L.), em fase de desenvolvimento ativo do sistema radicular.

Abstract

In order to obtain, under the soil and climate conditions of the Cerrados of the Federal District, a soil moisture level suitable for the cultivation of carrots (Daucus carota L.) in the active development phase of the root system, the crop was subjected, during that phase, to treatments that were distinguished by the minimum soil water potentials: 0.19; 0.24; 0.29 and 0.33 bar. The treatments began 40 days after sowing and the harvest was carried out at 110 days. The harvested roots were divided into commercial production and total production and the averages were, respectively: 37.79/30.88; 26.56 and 17.12 t/ha and 43.33; 35.58; and 30.80 and 22.63 t/ha. Both commercial production and total production only differed significantly for the treatment corresponding to the matric potential of 0.33 bar. It can be concluded, then, that, in order to obtain good carrot root production, irrigation should only be repeated when the water available in the soil is reduced to 60%.