Micronutrients and sodium in a soil cultivated with yellow passion fruit, with application of “supermagro” biofertilizer and potassium

Abstract

A field experiment was carried out during the period from March/2005 to February/2007, in the municipality of Remígio, Paraíba State, Brazil, in order to evaluate the action of the “supermagro” biofertilizer (fresh bovine manure + water + macro and micronutrients) applied on the soil in liquid form, on the contents of soil micronutrients and sodium. The treatments were distributed in randomized blocks, with three repetitions, using the factorial design 5 x 2, consisting of levels of “supermagro” biofertilizer diluted in water in a 1:4 proportion (0, 1, 2, 3 and 4 L per plant), combined with K₂O fertilization (with  and without K₂O), obtained from potassium chloride. The biofertilizer application on the soil in treatments without and with K₂O, increased the contents of boron, copper, manganese and zinc on the soil, but had no effects on sodium and iron content.