This study was carried out at UFPB, Areia, PB, from April to August 2009, aiming to evaluate the behavior of the sweet potato cultivated under organic fertilization, in experimental design of randomized blocks, in factorial scheme 3 x 6, with three sources of organic matter (bovine, chicken and goat manure), six doses, bovine and goat manure (0, 10, 20, 30, 40 e 50 t ha-1) and the chicken manure (0, 5, 10, 15, 20 and 25 t ha-1), with three repetitions. The sources of organic matter, chicken and goat manure provided mean weights of sweet potato roots of 264.9 and 197.6 g, respectively, in the doses of 39.8 and 12.9 t ha-1. The bovine manure has shown a mean weight of 202.2 g. The total mean productivity, depending on bovine manure doses was 13.3 t ha-1. The maximum commercial productivity of sweet potato roots of 16.7 t ha-1 was obtained in the estimated dose of 29.0 t ha-1 of goat manure. Among the organic materials evaluated the goat manure showed the best response for the productivity of commercial roots. The starch content was significantly influenced by the sources of organic matter.
Ipomoea batatas; organic fertilization; yield; quality
