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The aim of this work was to evaluate the use of three types of animal manure: poultry, cattle and sheep manure on lettuce production in a field experiment in an Oxisol, at the Federal Agro Technical School, in Crato, Ceara State, Brazil. The experimental design used was randomized blocks with factorial arrangement [(3 x 5) + 2], with three manures, five doses, and two additional Treatments, the first one with chemical fertilizer and the second one the control (without fertilizer), with four replications. The following variables were evaluated: fresh and dry matter of plant, yield ha-1 and number of leaves plant-1. The poultry manure provided higher yields of lettuce in the first crop, however, after the second crop it was surpassed by the cattle and sheep manures. The largest doses of the manure provided high yields until the third crop, being necessary new application for the maintenance of good results. The chemical fertilizer promoted high yields only until the second crop, being necessary a new application for the third crop.

Produtividade de alface com doses de esterco de frango, bovino e ovino em cultivos sucessivos