Natural bioconversion of green waste for tropical and subtropical climates and agriculture-based regions

This work aims to optimise the biotransformation upset by the high lignin content, of green wastes from urban parks and gardens, by creating optimal conditions for producing a natural and stable biofertilizer with adequate microbiological quality. The addition of other nutritive residues is a promising option, nutritious and complementary agro-industrial residues from the sugar and poultry industries were then selected. Seven formulations were tested, being inoculated by the non-pathogenic antagonist Aspergillus niger, a frequent saprophyte of tropical and subtropical climates like Morocco, to control the proliferation of potentially harmful indigenous alteration bacteria. The 15-day monitoring of efficacy and safety criteria demonstrated that it is possible to produce a nutritious biofertilizer that complies with France's NF U44–551 standard. It had no inhibitory effect on barley crops, with performance comparable to that of a commercial fertiliser. This research provides a promising approach for sustainable management of green waste in tropical and subtropical regions.