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Cauliflower and broccoli are important vegetables but have lacking and divergent information about potassium (K) fertilization in soil with a high K content. Two experiments were carried out from 2-1-2010 to 5-20-2010 in Jaboticabal City, Sao Paulo, Brazil, aiming to evaluate the effect of different K doses (0, 50, 100, 150 and 200 kg ha -1 K2O, in potassium chloride) on the yield of cauliflower ‘Verona’ and broccoli ‘BRO 68’ in Rhodic Eutrudox soil with a high K content. The broccoli and cauliflower responded positively but differently to potassium fertilization. The maximum yield of broccoli (12,476 kg ha -1 ) was obtained with 160 kg ha -1 K2O, while the yield of cauliflower increased linearly with increasing K dose, yielding 38,285 kg ha -1 with 200 kg ha -1 K2O. La coliflor y el brocoli son dos hortalizas economicamente importantes, sin embargo carecen de informaciones acerca de la fertilizacion con potasio (K) en suelo con alta concentracion de ese nutriente. En ese contexto, fueron realizados dos experimentos del 01 de febrero al 20 de mayo de 2010, en la ciudad de Jaboticabal, Sao Paulo, Brazil, con el objetivo de evaluar cinco dosis de K (0, 50, 100, 150 y 200 kg ha -1 de K2O), utilizando cloruro de potasio, sobre la productividad de la coliflor ‘Verona’ y del brocoli ‘BRO68’, en suelo tipo Rhodic Eutrudox con alta concentracion de K. El brocoli y la coliflor respondieron positivamente a la fertilizacion con potasio, pero con respuestas diferenciadas. La maxima productividad del brocoli (12 476 kg ha -1 ) se obtuvo con 160 kg ha -1 de K2O, mientras que la productividad de la coliflor aumento linealmente con el incremento de las dosis de K, produciendo 38 285 kg ha -1 con 200 kg ha -1 de K2O.

POTASSIUM FERTILIZATION OF CAULIFLOWER AND BROCCOLI IN A POTASSIUM-RICH SOIL