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Bragantia

versão impressa ISSN 0006-8705versão On-line ISSN 1678-4499

Resumo

CARVALHO, SÉRGIO ALVES DE; MATTOS JUNIOR, DIRCEU DE  e  SOUZA, MAURÍCIO DE. KNO3 effect on macronutrients contents on the dry matter of citrus rootstocks produced in containers . Bragantia [online]. 2000, vol.59, n.1, pp.89-94. ISSN 0006-8705.  https://doi.org/10.1590/S0006-87052000000100014.

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.

Palavras-chave : Citrus; propagation; nitrogen and potassium fertilization; nutrients; mineral nutrition.

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