The Technical University of Crete (TUC) is leading Pilot 7 (Chania, Crete), producing biochar from sewage sludge provided by the Municipal Wastewater Treatment Plant of Chania as well as from olive mill wastewater provided by a local olive mill.
The second field testing was completed in August 2021, where tomatoes were cultivated with and without biochar amendment as soil improver and bio stimulant.
Four conditions were tested: the “control” with no biochar amendment, the “sewage sludge dose 1” biochar treatment corresponding to 10 t of biochar per ha, the “sewage sludge dose 2” biochar treatment with 25 t of biochar per ha, and the “olive mill wastewater dose 2” biochar treatment with 25 t of OMWW biochar per ha.
The results were very satisfactory, since tomato yield increased significantly. Specifically, 50.7 kg of tomatoes were produced in total from Dose 2 of sewage sludge biochar treatment, while 17.2 kg of tomatoes were produced from control treatment.