Influência da irrigação e cobertura do solo no crescimento e desenvolvimento inicial do coqueiro anão verde.

Abstract

The objective of this research consisted of evaluating the effect of application of different volumes of water in covered and discovered soil on growth and vegetative development of the coconut tree (Coconuts nucifera L.), cultivar green dwarf, during the second year after the transplanting. The used experimental design was randomized blocks in factorial scheme [(4 x 2) + 1], with additional treatment and three repetitions, whose factors consisted of four different volumes of irrigation water (in function of ring diameter) and two soil covering conditions (SC - covered soil and SD - discovered soil), ,one more witness. The results didn't reveal significant difference among the treatments for the variables plant height and stem diameter in the four periods of evaluations (DAT - days after transplanting); the interaction ring diameter versus types of soil covering was significant, indicating an existing dependence among the effects. It was also verified that the best results for the variables plant height, green mass and dry mass were obtained when the crop was submitted to the ring diameter D3 (90 cm) in the presence of the discovered soil, already for the growth variable stem diameter the best results happened for the ring diameter D4 (100 cm) to the 420, 570 and 630 DAT for the condition of discovered soil. The variables root water content, ratio dry weight and root length, ratio plant height and root length presented better results when the crop was submitted to diameter D3 (90 cm). It is observed by the mean values of the additional factor (control), that for the variables plant height, stem diameter, green mass and dry mass didn't happen statistical differences in the four periods of evaluations of the crop.