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São relatados resultados de três ensaios de variedades paulistas de algodoeiro adubadas com diferentes doses dos elementos N, P e K, conduzidos em Latossolo Roxo não infestado pelo fungo causador da murcha de Fusarium, em 1965/66. As variedades IAC 13 e IAC 12 apresentaram ciclo vegetativo mais longo que a IAC RM3. A variedade IAC 13 superou em produção a IAC 12, e a variedade IAC RM3, que apresentou sintomas mais intensos de deficiência de potássio, obteve a menor média de produção. A dose básica de adubação, correspondente a 20, 45 e 40 kg/ha de N, P2O5 e K2O, aumentou significativamente a produção. Em média, a dose dupla proporcionou pequeno aumento, quando comparada com a básica, nas variedades IAC 12 e IAC 13. Em um dado ensaio, essa dose mostrou--se inferior à básica, quando aplicada à variedade IAC RM3. A variedade IAC 12 apresentou a mais alta média de porcentagem de fibra. A IAC 13 foi a melhor quanto aos índices Micronaire e Pressley. A adubação utilizada não concorreu para melhorar nenhuma dessas características; contribuiu entretanto para aumentar o pêso dos capulhos e das sementes. The behavior of three São Paulo cotton varieties (IAC 12, IAC 13 and IAC RM3), which differ themselves in vegetative cycle and nutrient requirements, after receiving three levels of complete N, P and K fertilization, were compared under cultivation on latossolic B "Terra Roxa" soils. The inclusion of the variety IAC RM3, resistant to Fusarium wilt, was made considering a possible spreading of this disease, now common in sandy soils, to clay soils. A basic dose of NPK fertilizer, containing 20, 45 and 40 kg/ha of N, P2O5 and K..O respectively, induced a significant increase in cotton yield, in relation to control plots, where no fertilizer was added. Among the varieties, IAC 13, with longest life cycle, presented the highest yield, followed by IAC 12, with intermediate cycle length. IAC RM3 was the less productive. There was also a significant increase in the weight of seeds and bolls due to this basic dose. No appreciable effect of a possible interaction between varieties and fertilization could be noticed. A double dose of fertilizer produced further increase in yield, except in the case of IAC RM3, in which additional amount of fertilizer induced a slight yield reduction and many plants showed signs of potassium defficiency. Considering the fiber characteristics the tested varieties differed significantly. IAC 12 had the highest mean of lint percentage, while IAC 13, on the average, was the best for Micronaire and Pressley indices, confirming previous unpublished determinations

Comportamento de variedades paulistas de algodoeiro em diferentes níveis de adubação N,P e K, em Latossolo Roxo - (1.ª série)