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The success of melon culture depends, among other factors, the achievement of high productivities using a low cost fertilization and fertilizer use of sources which are cheaper. The objective of this study was to evaluate the responses of two melon cultivars to nitrogen sources (N), phosphorus (P) and potassium (K) in soil with melon cultivation history in the Chapada do Apodi, RN, being one experiment with yellow melon and one with the harper melon. The experimental design was a randomized block with four replications and the variables evaluated in both experiments were: productivity, weight, firmness and soluble solids content of the fruit. In plants were evaluated NPK content in the leaves. The sources of N, P and K in the soil do not influence on yield and fruit quality of yellow melon and produced harper. The foliar N, P and K of the evaluated melon are not influenced by nitrogen sources, except for the leaf concentration of K in harper melon. The P sources influence on foliar N and K and, K sources on foliar N, P and K, in both melon evaluated. The sources of N, P and K in the soil don’t promote significant changes on production and fruit quality of yellow and harper melons. The sources of N, P and K to be chosen for the management fertilization of yellow and harper melons can follow criteria of economic and operational, to maintain the balance of other soil chemical properties.

COMPARAÇÃO DE FONTES DE FERTILIZANTES N-P- K UTILIZADAS NA FERTIRRIGAÇÃO DO MELOEIRO