The leather industry generates large amounts of a Cr-containing solid waste (wet blue leather). This material is classified by the Brazilian Environmental Council as a category-one waste, requiring a special disposal. The patented process Br n. PI 001538 is a technique to remove chromium from wet blue leather, with the recovery of a solid collagenic material (collagen), containing high nitrogen levels. This work aimed to evaluate the residual effect of soil application of collagen on the production of dry matter, content and accumulation of N in common bean plants (Phaseolus vulgaris L.), after the previous growth of elephantgrass (Pennisetum purpureum Schumach.) cv. Napier, as well as to quantify the mineralization rate of N in the soil. The application of collagen, at rates equivalent to 16 and 32？t？ , provided greater N contents in the common bean plants, indicating residual effect of these rates of application; the same was observed for the rates of 4 and 8？t？ , though in smaller proportions. Higher mineralization rates of N collagen occurred next to 16 days after soil incubation. During the 216 days of incubation, the treatments with collagen showed higher amounts of mineralized nitrogen. 1. Introduction The production of leather industry solid wastes has increased and the use of such wastes as fertilizers represents an interesting alternative for their disposal, with less potential impact to the environment [1]. The production of chromium-containing solid waste in tanneries has been recognized as a problem for many years,and increasing pressure from environmental authorities has demanded a solution of such a problem [2]. Historically, shavings, trimmings, and splits from the chromium tanning of hides and skins have been disposed of in landfills. However, increasing local restrictions on land disposal and the high costs of incineration have stimulated the search for alternative treatments. Many scientific groups have oriented their research to find a process to recycle and treat these wastes [3–11]. In Brazil, some research was carried out to evaluate the effect of leather industry works in the growth of cultures of commercial interest [12–15]. Castilhos et al. [13] evaluated the yields of wheat, lettuce, and radish, as well as the chemical changes in an Oxisol due to the addition of tannery wastes (primary tannery sludge; chromium-tanned leather shavings; finished leather shreds). Yields of the three crops in microplots treated with the wastes were similar to that obtained in microplots treated with lime plus NPK. Chromium concentrations in the
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