Résumé:
In ancient times, humans took a different approach to waste disposal. They often used livestock effluent as a soil fertilizer, helping to maintain the fertility of the land. They also spread wastewater for various purposes. This was a common way of managing waste at the time, based on the knowledge and resources available at the time. This practice relies on the soil's ability to degrade the organic matter present, so the physic-chemical properties of the soil play an essential role in maintaining soil fertility.
To this end, we applied sludge from the wastewater treatment plant in the wilaya of Mostaganem, and tested the effect of three doses 10, 20 and 30 kg of sludge applied to plots compared with a control without sludge application on soil cultivated with zucchinis. The effects studied in this experiment indicate that sludge application has a beneficial effect on soil fertility and consequently on crop yield. Observations on the crop show that the best yield was obtained with treatment D3. The improvement in yield is due to the fertilizers contained in the sludge, which is a potential source of organic matter and also contains essential nutrients for crop growth.
Sludge inputs had a more marked effect on soil physic-chemical parameters at D3. The increase in electrical conductivity (5.47 ds/m) in the soil is only significant for the highest D3 dose. Our soils show relatively low limestone values, and a fairly high level of over 5% at D2. Furthermore, the sludge applied improved the organic matter content, the element to which the fertility and life of a soil are attached.
