Crescimento inicial de mudas de Caesalpinia ferrea ex. Tul var. Leiostachya Benth Caesalpinaceae (pau ferro) sob diferentes regimes hídricos e sombreamento

Abstract

The objective of this work was analyze the growth of seedlings (Caesalpinia ferrea Mart. ex. Tul. Var. Leiostachya Benth (Leguminosae) under 0%, 50% e 70% of shadow. The seedlings were submitted to the treatments on the 60 days after the transplant. The experimental outline was entirely randomized in factorial outline 3x5 (shadows levels and evaluation times in 60, 90, 120,150 and 180 after transplant) with four repetitions of 10 seedlings for experimental unit. Plants cultivated under 70% of shadow presented larger concentration of total chlorophyll (38,79 g cm2) larger foliate area (51,54g cm2), larger rate of relative growth (0,0322g g-1dias) and foliate weight (0,2708g g -1). The largest height (110,34 cm), diameter (9,3 mm), dry masses of the root (11,13g), of the leaf (5,59g), of the aerial part (16,05g) and foliate area (705,25cm2) were observed in the cultivated plants in 50% of shadow. The growth of the root, specific foliate weight, liquid assimilatória rates and specific foliate area didn't vary in function of the different levels of brightness (averages of 9,3cm;0,0082g cm2 and 0,0006 g cm2 day-1; 186,24g cm2 respectively). The seedlings of Leopard tree presented better growth when cultivated under 50% of shading.