Use of olive pomace as an amendment to improve physicochemical parameters of soil fertility

摘要

Given their richness in nutritive elements, the majority of agricultural waste is used assoil amendments, including olive oil waste. The purpose of this study is to determine the effectsof the use of olive pomace from three extraction systems on the physico-chemical fertility of thesoil, after their use as an amendment for faba bean cultivation. The experiment is carried out atthe Civil Engineering and Environment Laboratory in the EST of Salé, in pots where the olivepomace has been mixed with the soil, respecting the percentages studied. Several relativephysico-chemical parameters of soil fertility were determined at the end of the experiment,namely pH, electrical conductivity (EC), total kjeldhal nitrogen (NTK) content, organic carbonand exchangeable bases concentration and soil cation exchange capacity (CEC) determination.Different percentages of pomace from the three extraction systems were applied (control, 10%,15%, 25%, 50%, 75% and 100%) for four months of bean germination test. The application ofthe pomace reduced soil pH, and increased soil organic matter and organic carbon content inproportion to the added percentage of pomace. The available phosphorus and exchangeablepotassium content increased significantly (p < 0.05) in pots containing different percentages ofpomace compared to their concentrations in the soil (control). The total nitrogen content has notincreased sufficiently but remains significantly different from the control, especially for thepercentages of 25%, 50% and 75%. For its part, the cation exchange capacity (CEC) is importantand will allow a good retention of nutrients for all percentages.