The textile industry at region of Entre Douro e Minho is located at Ave valley and is responsible for a great amount of cotton solid wastes. Currently these wastes, which are characterised by a high C/N ratio and some salinity, are directly applied to soil by farmers without any previous treatment (Zucconi et al, 1981). Extraction of peat causes environmental damage (Smith, 1992) which leads to protesting movements by ecological organisations. Other organic products are therefore sought to be used as substrates instead of peat.
Experiments were carried out aiming at increasing the fertiliser value of the cotton waste by applying composting, and evaluating the potential of cotton compost in substituting peat .
To the best knowledge of the authors, there is only one publication of cotton composting subject; the one of Soliva et al (1989). Sin this study cotton residues were mixed with cow manure and pine bark resulting in good composting results.