Effects of bone meal and hydrogel on the leaf contents of dwarf cashew

In semi-arid regions, where seasonal drought or irregular rainfall distribution are common occurrences, agricultural management techniques or strategies, such as the use of bone meal and/or hydrogel, can mitigate adverse conditions and ensure crop production. This study aimed to evaluate the effects of bone meal doses (0, 250, 500, 750 and 1,000 g pit-1), in association or not with hydrogel (0 and 5 g pit-1, respectively), on the leaf nutrient content of the dwarf cashew cultivar BRS 226. The leaf nutrient contents were evaluated during two growing seasons. For being a good source of macronutrients, the bone meal increased the levels of N, P, Ca, K and Mg in the dwarf cashew leaves. The leaf contents of the micronutrients Zn, Fe and Mn decreased with increasing bone meal doses. The nutrient accumulation in the leaves of the dwarf cashew planted in pits with bone meal and hydrogel has the following order: N > K > Ca > Mg > P > Mn > Fe > Zn > Cu. The application of bone meal at levels close to 600 g pit-1, mainly with the use of hydrogel, is a viable fertilizer alternative for dwarf cashew.