Efeitos do déficit hídrico no cultivo de mudas de eucalipto

Abstract

The objective of this study was to determine the water requirement of Eucalyptus globulus under different irrigation levels in the North region of Minas Gerais. The treatments consisted of six irrigation levels (50%, 75%, 100%, 125%, 150% and 175% of the reference evapotranspiration - ETo) with four replications fully randomized. The results indicate that the seedlings of E. globulus grown under irrigation blade corresponding to 75% of ETo (blade consumed 377.66 mm) were responsible for shoot growth of plants (63.75 cm), higher instantaneous efficiency and water use (0.14 μmol m-2 s-1 and 0.0419 g mm-1, respectively). In addition, the seedlings under this irrigation blade presented higher Dickson quality index (5.64) and higher capacity for osmotic regulation with higher leaf proline content (124.94 μg g-1). The coefficient of cultivation (Kc) for the highlighted conditions was equivalent to 1.4.