Dew and rain water collection in south Croatia.

Composting of organic residue is an interesting alternative to recycle waste. The co-composting of agricultural waste is a new management in Tunisia. Agricultural residues used in this study are mainly Mediterranean wastes. Obtained composts may be used as soil amendments or as compounds in the horticultural and soilless substrates. The main objectives of this work were to investigate the principal physicochemical properties during composting process of five mixtures of wastes, with different carbon/nitrogen (C/N) ratios, prepared by the pile system and humidified with a mixture of confectionery and olive mill wastewater. During the composting process the bulk temperature of piles was recorded. Composts sampling was assessed once a month during mesophilic and thermophilic phases, twice during maturation phase (at 12 and 18 months). Physicochemical analyses of agricultural residues and composts samples were established. The pH and electric conductivity (EC) were determined in a solution ratio 1/5 (v:v) and values varied from 8 to 9.8 and 0.67 to 4.3 respectively. The organic matter contents (OM) were determinated and levels varied from 55% to 20%. Total nitrogen (TN) and carbon contents (TC) were measured by elementary analyses and values ranged from 0.62% to 1.2% and 35% to 10% respectively. The C/N ratios of composts are related to the nature of used wastes.