Recycling of solid waste rich in organic nitrogen from leather industry: Mineral nutrition of rice plants
2011
Nogueira, Francisco G.E. | Castro, Isabela A. | Bastos, Ana R.R. | Souza, Guilherme A. | de Carvalho, Janice G. | Oliveira, Luiz C.A.
The leather industry produces a large quantity of solid waste (wet blue leather), which contains a high amount of chromium. After its removal from wet blue leather, a solid collagenic material is recovered, containing high nitrogen levels, which can be used as a nitrogen source in agriculture. In order to take more advantage of the collagen, it was enriched with mineral P and K in order to produce NPK formulations. The objective was also to evaluate the efficiency of such formulations as a nutrient supply for rice plants in an Oxisoil, under greenhouse conditions. The application of PK enriched-collagen formulations resulted in N contents in the vegetative parts and grains of rice plants which were equivalent or superior to those obtained with urea and commercial NPK formulations.
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