Micronutrients in potted gerbera cultivars

Abstract

The present work aimed at evaluating the contents and accumulation in four different gerbera cultivars subjected to fertigation with two nutritive solutions. The experiment was carried out in a greenhouse, from May to July 2006, at DNR, Soil Science Sector, Agronomical Sciences College, UNESP, Botucatu, São Paulo State. The experiment was installed in randomized blocks and constituted of a 4x2 factorial scheme, being four gerbera cultivars (Cherry, Golden Yellow, Salmon Rose and Orange) and two concentrations of nutritive solution (S1-50% and S2-100%), corresponding to the electrical conductivity of 0,92 and 1,76 dS m-1, during the vegetative period and 1,07 and 2,04 dS m-1, during the reproductive one. By the end of the vegetative (41 DAA) and reproductive (62 DAA) periods, were quantified the contents and accumulation of the micronutrients in vegetal tissue. The nutrients demands had been differentiated between the cultivars, smaller to Orange (59 mg kg‑1 B, 5 mg kg‑1 Cu, 180 mg kg‑1 Fe, 46 mg kg‑1 Mn, at the end of cycle). The supply of nutrient solution more concentrated reflected in a higher content of micronutrient in the tissue. The greatest accumulations had been registered at the reprodutive period, presentig the following order of absortion Fe>Mn>B>Zn>Cu (237, 72, 71, 30 e 6 μg plant-1).