NITROGEN, PHOSPRORUS AND POTASSIUM LEVELS IN NUTRITION OF CITRUS ROOTSTOCK ‘RANGPUR’ LIME

Abstract

The objective of this work was to evaluate the effects of doses a fertilizer N, P and K on the nutritional status of citrus rootstock of ‘Rangpur’ lime, in UNESP/FCAV, Brazil. The experimental design was randomized blocks, in a factorial experimental design in 3³ + 1, with three replicates. The standard doses of N, P and K were 920 mg dm^-3, 100 mg dm^-3 and 790 mg dm^-3, respectively. The treatments were: D1 – half the standard dose, D2 - the dose standard, and D3 - double the standard dose given, beyond the control (without fertilizer).  After the emergence of the seedlings, fertilizations were done though fertirrigation. The concentration of nutrients in solution was to increase to the growth of the seedlings. The fertilizations N and K, in each experimental unit, were applied until fifteen weeks. Already the phosphates fertilizations were built into the substrate at the time of sowing. After 120 days the emergence, the seedlings were evaluated at nutritional status. From the results of dry matter and nutrient content calculated is the accumulation of N, P and K in plants. The nitrogen level 1,840 mg dm^-3 content and a higher accumulation of N, for the range of doses studied. The increase of P and K above of 100 and 790 mg dm^-3 not provide increase in the absorption of these nutrients, respectively.