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EnglishMaintenance fertilization changes with nutrient requirements and partitioning, but these are not well known for oat cultivars. The aim of this study was to evaluate whether phosphorus (P) requirements and partitioning vary among cultivars of oat (Avena sativa L.). The UPFA ‘Ouro’, UPFPS ‘Farroupilha’, IPR ‘Afrodite’, URS ‘FAPA Slava’, ‘Barbarasul’, ‘FAEM 007’, URS ‘Taura’, and ‘URS 21’ were cultivated in a Latosol with high P content in a greenhouse in 2015. Plants were sampled at physiological maturity and divided into roots, stem, leaves, and grain tissues. Phosphorus content and the dry matter weight of these parts were evaluated and the uptake amount and partitioning of P were estimated. The values of these variables differed across cultivars, except the P content in the grain (‘average’, 4.0g P kg-1). ‘Afrodite’ and ‘FAPA Slava’ have lower requirements and partitioning of P in the grain, but these did not vary among the other cultivars. Requirements and partitioning of P in stem and leaves increased in the following order: ‘Ouro’ and ‘Farroupilha’ Key words: avena sativa L.; phosphate fertilization; maintenance fertilization. portuguesA adubacao de reposicao varia com a demanda e a particao de nutrientes, mas isso e pouco conhecido em relacao as cultivares de aveia. O estudo objetivou avaliar se a demanda e a particao de fosforo (P) diferem entre cultivares de aveia-branca. As cultivares ‘UPFA ‘Ouro’, ‘UPFPS Farroupilha’, ‘IPR Afrodite’, ‘URS 21’, ‘URS FAPA Slava’, ‘Barbarasul’, ‘FAEM 007’, ‘URS Taura’ e ‘URS 21’ foram cultivadas em um Latossolo com teor alto de P, em estufa agricola, no ano de 2015. Na maturacao fisiologica, as plantas foram fracionadas em raizes, colmo, folhas e grao e o teor de P e a massa seca desses orgaos foram avaliados, estimando-se a quantidade e a particao desse nutriente. O valor dessas variaveis diferiu entre cultivares, exceto o teor de P do grao (media 4,0g P kg-1). Nessa parte da planta, a demanda e a particao desse nutriente foi menor na ‘Afrodite’ e na ‘FAPA Slava’, nao diferindo entre as demais cultivares. Na parte vegetativa (colmo + folhas), o valor dessas variaveis aumentou na seguinte ordem: ‘Ouro’ e ‘Farroupilha’ Palavras-chave: avena sativa L.; adubacao fosfatica; adubacao de reposicao.

Phosphorus requirement and partitioning in oat cultivars