Resumo

REJANE RIBEIRO, Rúbia et al. Growth analysis of green-leaf lettuce under different sources and doses of organic and mineral fertilization. rev.colomb.cienc.hortic. [online]. 2019, vol.13, n.2, pp.237-247. ISSN 2011-2173.  https://doi.org/10.17584/rcch.2019v13i2.8521.

The objective of this study was to evaluate the influence of different sources and doses of organic and mine ral fertilization on the production of green-leaf lettuce. The experiment design used randomized blocks in a factorial scheme (6x3), with six doses of fertilizers (1 = 0; 2 = 25; 3 = 50; 4 = 100; 5 = 150, and 6 = 200% of the recommended fertilization for green-leaf lettuce crop) and three sources of fertilizers [cattle manure (CaM) and chicken manure (ChM), decomposed, on a wet basis and applied 100% at planting at the doses: CaM - 0, 12.5, 25, 50, 75, 100 Mg ha-1; ChM - 0, 5, 10, 20, 30, 40 Mg ha-1; mineral fertilization (MF) varying the N levels: 0, 37.5, 75, 150, 225, 300 kg ha-1 plus 400 kg ha-1 of P2O5 and 60 kg ha-1 of K2O]. The fertiliza tion with CaM and ChM was more efficient than the MF at increasing the production of green-leaf lettuce, mainly because of the higher residual effects of P in the Oxisol. The ChM provided a higher soil pH, P and K, while the CaM provided a higher soil Mg, organic carbon and organic matter. The dose with 144% of organic fertilization exclusively on a wet basis corresponding to 72 Mg ha-1 of CaM and 29 Mg ha-1 of ChM resulted in the highest green-leaf lettuce yield.

Palavras-chave : Lactuca sativa L.; phosphorus; nitrogen; cattle manure; chicken manure.

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