Micronutrientes e sódio num solo cultivado com maracujazeiro amarelo, com a aplica o de biofertilizante supermagro e potássio Micronutrients and sodium in a soil cultivated with yellow passion fruit, with application of “supermagro” biofertilizer and potassium

Um experimento de campo foi executado, no período de mar o/2005 a fevereiro/2007, no município de Remígio, PB, para avaliar o efeito do biofertilizante supermagro (esterco fresco de bovino + água + macro e micro nutrientes), aplicado ao solo na forma líquida, sobre os teores de micronutrientes e sódio no solo. O trabalho consistiu na combina o de dois fatores: doses de supermagro, diluído em água na raz o de 1:4 (0, 1, 2, 3 e 4 L por planta), combinadas à aduba o de K2O (com e sem K2O), oriundo de cloreto de potássio, compondo um fatorial 5 x 2, no delineamento experimental em blocos casualizados, com três repeti es. A aplica o de supermagro, independentemente da adi o de K2O, promoveu aumento dos teores de boro, cobre, manganês e zinco, mas n o interferiu nos conteúdos de ferro e sódio no solo. 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.