Study of fertilization NPK in the growth
variable and inflorescences productivity
of Heliconia sp.
This work had as objective analyzes the effect of
doses of N, P2O5 and K2O on growth variable and initial
productivity of inflorescences of Heliconia
psittacorumL. f. ‘St. Vicent Red’ and Heliconia
psittacorum L. f. x Heliconia spathocircinata Aristeguieta ‘Golden Torch’, under savannah soil. The
experiment was led in field condition on a Red Latosol,
in Fiore Mio farm, at Santo Antônio de Goiás, State
of Goiás, Brazil, during the period of January- October/
2002. The xperimental design was in randomized
block, with fifteen treatments and three repetitions arranged
according to experimental matrix Pan Puebla
II. The treatments consisted of the combination of four doses of N (0, 200, 400 and 600 kg/ha), four of P2O5 (0,
80, 160 and 240 kg/ha) and four of K2O (0, 80, 160,
240 kg/ha) To the 260 days after the planting was collected
the data of the length of the pseudstems, length
of the floral stem and diameter of the floral stalk. The
inflorescences productivity was computed every fifteen
days until 270 days of the planting. The obtained results
allowed to conclude that the two varieties answered
to the application of the differently fertilization NPK.
The application of crescent doses of nitrogen to the
soil favored the lineal increase of the four variables
analyzed in Heliconia ‘Golden Torch’ not happening
the same for the other two macronutrients, it was
observed that the maximum doses of P2O5 and of K2O
(240 kg/ha) they presented decrease in the parameters
analyses. In Heliconia ‘St. Vicent Red’, the
growing doses of P2O5 and K2O influenced all the
analyzed parameters and N positively it favored only
the lineal increase of the inflorescences production.
The largest inflorescences productivities were obtained
in the treatment 10 (600-160-160) with 17.2
inflorescences.m-2 for Heliconia ‘Golden Torch’ and
in the treatment 12 (400-240-160) with 17.1
inflorescences.m-2 for Heliconia ‘St Vicent Red’.