Soil amendment by olive pomace improving soil quality
The majority of agricultural wastes, including olive oil mill waste, are used as soil amendments due to their high nutritional value.The purpose of this study was to investigate the effects of the amendment with olive mill pomace from a 3-phase cold-pressed system on the characteristics fertility of the soil pH, electrical conductivity (EC), and organic matter (OM). The experiment was carried out using two increasing rates of olive mill pomace (50% and 100% w/w) plus the control untreated soil in microcosms under laboratory conditions. the results showed that the 50% of olive mill pomace was slightly reduced soil pH and slightly increased on soil (EC), while the 100% of olive mill pomace has a significant decrease on soil pH and a significant increase in soil (EC), Moreover, the amendment of the soil with olive mill pomace has significantly increasing soil organic matter. As a result we can consider the olive mill pomace as a soil fertilizer. Pretreatment of olive mill pomace to reduce acidic pH and salt content before use as a soil amendment is also recommended.