Common bean (Phaseolus vulgaris L.) is frequently grown in weathered soils with low phosphorus (P) availability, and this is one of the main limitations on its production. This study aimed to assess 20 common bean genotypes in a hydroponic system to select the best P concentration for inducing nutritional deficiency and to classify the genotypes in terms of nutrient utilization efficiency. The concentrations of P applied were 8.00, 4.00, 2.00 and 0.05 mg L -1. At 21 days, in the plot subjected to an application of the most severe stress, the 0.05 mg L -1 dose of P, had smaller plant size and early leaf abscission was observed. The 4.00 mg L -1 dose of P was the most efficient in inducing stress for discrimination of cultivars in terms of efficiency of use of P. The following genotypes: IAPAR 81, Carioca Comum, IAC Carioca Tybatã, IAC Imperador and G 2333 stood out as being efficient and responsive to P, while the two cultivars DOR 364 and Jalo Precoce were the most inefficient and unresponsive.
Dedico esta tese a minha esposa Rosana e ao nosso filho Renan v
AgradecimentosAo povo brasileiro que, por intermédio da Unicamp e do CNPq, me concedeu mais esta oportunidade de aperfeiçoamento acadêmico.A toda minha família, em especial aos meus pais José Expedito e Maria Creuza, aos meus irmãos Douglas e Maiara, a minha esposa Rosana e ao meu filho Renan pela compreensão incondicional e pela amizade de todas as horas.Ao Professor Jorge Vega pela ciência e paciência na orientação, pela confiança e pelo apoio sempre que necessário durante esses anos, fica registrado minha gratidão.A todos os professores, funcionários e estudantes, que fazem do Departamento de Fisiologia Vegetal da Unicamp um local favorável para o aprendizado, em especial ao amigo Gilberto Costa Justino.
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