Abstract
Comparative effects of untreated olive mill wastewater (UOMW), treated olive mill wastewater (TOMW) and bioaugmented olive mill wastewater (BOMW) on soil properties, on seeds germination and on plants growth were investigated.
Highlights
Potassium (K) fixation is common in most soils, and this underscores the importance of the nutrient addition as fertilizer nutrient and its availability to plants
All the studied soil was acidic in nature; this may be due to the soil management practices or the sandy texture could have promoted the leaching of soil basic cations
Low values were observed for effective cation exchange capacity and exchangeable acidity in the soil samples; these could be a result of washing out of exchangeable bases in the soil (Olatunji et al 2007)
Summary
Potassium (K) fixation is common in most soils, and this underscores the importance of the nutrient addition as fertilizer nutrient and its availability to plants. Omueti and Laukullich (1988) reported that the presence of aluminum (Al) in soil interlayer 2:1 and mixed-layered silicates exhibit a pronounced affinity for K. This may invariably modify K exchange reactions and availability to crops in highly weathered soils of the tropics. It is established that K released from micaceous clays like muscovite or biotite occurs when there is exchange between the K and hydrated cations; it may be as a result of mica dissolution which takes place before the formation of weathering products The importance of these two (muscovite and biotite) in K chemistry is based on the stability of mica and soil environments (Sparks 2000). This is even more important in Nigeria where the soils are mostly deficient in K and large quantities of the animal manures
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