Inorganic Fertilization at High N Rate Increased Olive Yield of a Rainfed Orchard but Reduced Soil Organic Matter in Comparison to Three Organic Amendments

Strategies for waste valorisation from domestic and agro-industrial activities must be pursued, its use as a soil amendment is an interesting possibility. In this four-year study, the effect of applying municipal solid (MSW), farmyard manure (FYM), bottom wood ash supplemented with nitrogen (Ash + N), inorganic fertilization common in region (50 kg ha−1 N, P2O5 K2O) (Control) 70 N (High N) was assessed rainfed olive grove planted shallow low organic matter managed conventional tillage. The High treatment significantly increased yield comparison to other treatments (165% more than MSW), available proved main driver tree productivity. MSW FYM matter, well levels phosphorus cation exchange capacity, leaving good indications future production cycles, although during four years study these provided little trees. reduced (63% less MSW). result attributed part management system that did not allow development herbaceous vegetation, but also known “added interaction”, which excess might have contributed accelerate mineralization native aspect compromises sustainability strategy. Although are sometimes associated risks environmental contamination heavy metals, metals soils plant tissues were concern.