Some characteristics of a new organic soil conditioner from the co‐composting of olive oil processing wastewater and solid residue

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Abstract
The effectiveness of a new organic soil conditioner from the co‐composting of olive oil processing wastewater and solid residue was examined through the evaluation of some of its physical and chemical characteristics. The concentration of 25% w/w of this material into the conditioner‐soil mixtures appears to be the maximum level for the cultivation of tomato plants. The plants grown on this conditioner‐soil mixture were 1.52±8.5% times larger than those grown on a sandy loam soil. The pure conditioner cannot be used as a substrate for the growth of tomato plants. The water‐holding capacity of the conditioner was almost two times higher than that of the pure soil and remained almost stable for temperatures between 8–40°C. The apparent density of the conditioner was 0.5 times smaller than that of the pure soil. With increased application rate of the conditioner to the soil, there was a decrease in the pH, an increase in the specific conductivity, and an increase in the ammonium‐nitrogen (NH4‐N) and phosphorus (P) concentration of the mixture.

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