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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’.

ISSN: 2447-536X

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