Bio-fertilizers issued from anaerobic digestion for growing tomatoes under irrigation by treated wastewater: targeting circular economy concept

Tomatoes (Solanum lycopersicum) plant were provided with bio-fertilizers issued from anaerobic digestion of olive mill wastewater without and 1%, 5% phosphate residues in mesophilic conditions for 25 days. 1% raw substrates (OMW raw; OMW + 1%PR 5%phosphate residues) digestates (olive digestate, 1%phosphate digestate digestate) was fortnightly to the plants. Reclaimed water a treatment located study site used automatically controlled irrigation. It contained low level chemical fertilizers compare tomato growth, leaf analysis, steam potential, production yield fruit quality results plants fed bio-fertilizers. Generally, parameters progressively increased during growing harvesting stage, which refer essential elements that cover plant’s needs. Plants showed most extended height raw), best accumulation leaves digestate). The maximum average weight per (35.5 g) obtained when applying mixture residues. phosphates Bio-fertilizers (digestates) good performances, high perfect compared control Results this are considered promising regarding environmental framework. However, done laboratory scale needs be applied large provide more data on effectiveness application. is also recommended apply these different crops various soils better evaluation.