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Foi estudado o efeito da adubação fosfatada no desenvolvimento inicial de mudas de goiabeira serrana (Feijoa sellowiana Berg.) num experimento em vasos, com solo Podzólico Vermelho Amarelo, apresentando 4 ppm de P extraível pelo método de Mehlich. Os níveis de fósforo utilizados foram 0, 50, 100 e 150 ppm de P, aplicados antes da instalação do experimento, juntamente com 150 ppm de K. Em cobertura, foram aplicados 150 ppm de N, em três parcelas iguais aos 7, 27 e 47 dias após a repicagem das mudas. Plântulas oriundas de sementes de plantas nativas, com aproximadamente 30 dias, foram transplantadas para os vasos e cultivadas durante 89 dias. Houve efeito significativo do P sobre todas as variáveis analisadas. A altura das plantas mostrou um comportamento similar à curva clássica do crescimento, mas os incrementos obtidos a cada avaliação aumentaram com os níveis de P. A matéria seca das raízes e da parte aérea, bem como as quantidades extraídas de N, P e K aumentaram linearmente com os níveis de P. O teor de P no tecido aumentou até o nível de 50 ppm de P aplicado, permanecendo estável nos níveis maiores, enquanto os de N e K diminuiram nos níveis acima de 50 ppm de P. Os resultados obtidos permitem verificar a elevada exigência de fósforo desta espécie no período inicial de crescimento. The effect of phosphate fertilization on the initial development of feijoa (Feyoa sellowiana Berg.) seedlings was studied in a pot experiment with a Red Yellow Podzolk soil having 4 ppm of extractable phosporous by the Mehlich method. Levels of phosphorous of 0, 50, 100 and 150 ppm together with 150 ppm of K were applied as a basal dressing. In three equal portions 150 ppm of N were applied at 7, 27 and 42 days after the transplant of the seedlings. Seedlings of native plants, with 30 days approximately, were transplanted to pots and cultivated during 89 days. There was a significant effect of phosphorous on all analised variables. Plant height showed the behaviour of the classic growth curve, but the increments obtained at each evaluation increased with the levels of P. Root dry matter, aerial parts, as well as the extracted quantities of N, P and K increased linearly with the P levels. The concentration of P in the tissue increased up to the level of 50 ppm, remaining stable for the higher P levels, those of N and P decreased for the levels above 50 ppm of P. Results obtained permit to verify the high requirement of this species in relation to phosphorous, in the initial growth period

Efeito do fósforo no desenvolvimento inicial de mudas de goiabeira serrana