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Este estudo teve por objetivo avaliar os efeitos de três freqüências de aplicação (uma, duas e três vezes por semana) de quatro doses de KNO3 (1,5; 3; 4,5 e 6 g.L-1) em cobertura, nos teores de macronutrientes, na matéria seca total dos porta-enxertos cítricos limoeiro 'Cravo' (Citrus limonia Osbeck) e tangerineira 'Cleópatra' (Citrus reshni Hort. ex Tanaka). As sementes foram germinadas em bandejas de 128 células piramidais comportando, cada uma, cerca de 75 cm³ de substrato e as plantas, mantidas em condições de casa de vegetação. O aumento na dose e freqüência de aplicação do KNO3 proporcionou elevações nos teores de N e, de maneira geral, diminuição nos teores de P, K, Ca, Mg e S na matéria seca total das plantas dos dois porta-enxertos avaliados aos 120 dias pós-semeadura. The objective of this work was to evaluate the effects of dosages and frequency of potassium nitrate (KNO3) application on macronutrients contents of two citrus rootstocks. Seeds of Rangpur Lime (Citrus limonia Osbeck) and Cleopatra mandarin (Citrus reshni Hort. ex Tanaka) were germinated in speedlings flats, containing 128 pyramidal cells holding about 75 cm³ of vermiculite and pinus rind substrate. Three frequencies of application (1, 2 and 3 times per week) of four dosages of KNO3 (1,5; 3; 4,5 and 6 g.L-1) plus a non-fertilization control for each rootstock, were tested. Increasing the dosages and the frequencies of KNO3 application resulted in higher N and lower P, K, Ca, Mg and S concentration in plants dry matter at 120 days after sowing

Efeito do KNO3 nos teores de macronutrientes na matéria seca total de porta-enxertos cítricos produzidos em bandejas