This study aimed to evaluate the nutrient losses by leaching as a function of the type of incorporated organic residues into the soil, as well as the accumulation in the melon crop. The experiment was developed in a greenhouse of the UFC/CCA. The soil was a Ultisol, collected in the layer of 0-10 cm. A completely randomized design considering four replications was adopted. The treatments tested were: 0% of organic residues (TEST); 100% of cattle manure (EB); 100% of rice straw (PA) and 50% of cattle manure + 50% of rice straw (EB + PA). The soil bulk density, the nitrogen (total NT, mineral NM and organic NO), total organic carbon (CO), P, K, Ca, Mg and Na in the soil, in the leached water and in the plants were evaluated. The lowest and highest soil bulk density values were found in the PA and TEST treatments, respectively. Nutrients losses by leaching, mainly in relation to P, were observed. The leaching of nutrients seems to be greater in the treatments using cattle manure. The NT and CO losses were not caused exclusively by leaching.
organic fertilization; mineral fertilization; loss of phosphorus
