Efeito de adjuvantes sobre absorção de zinco e manganês na adubação foliar

Abstract

The objective of the present work was to evaluate the effect of lecithin, starch and silicon may have in the efficiency of foliar feeding, that is: Can these products really contribute to the absorption and translocation of minor nutrients? Can the source of nutrient, sulfate and chelate, influence the result? The experiment was carried out under greenhouse condition at Univerdidade Federal de Goiás (Jataí unit)/GO, set in a completely randomized design, with six replications, four factors in study and two levels each, making a 2x2x2x2 factorial arrangement , totalizing 16 treatments. Moreover, it was added a control as an additional treatment, totalizing then, 102 experimental units. Each experimental unit was constituted by a vase of collard green plant. The treatments consisted of 2 minor nutrient sources (sulfate and chalate) and of absence and presence of three substance added to the spray solution: lecithin dewaxed (L), a commercial silicon surfactant (S), and stanch (A). After analyses of the leaves, 30 days after de pulverization, it was clear that the amount of zinc and manganese was influenced by the adjutants and kind of fertilizer. The use of lecithin increased the absorption of zinc sulfate whereas the use of silicon increased only the absorption of zinc chalate. Both chelate and sulfate increased the absorption of manganese. The starch drove to a reducing absorption of zinc chelate.