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Vasileios A. Plant species were irrigated at rates according to their water requirements with either freshwater or wastewater effluent.
Pots irrigated with freshwater received commercial fertilizer, containing N, P, and K, applied at the beginning of each irrigation period. The results obtained in this study showed that irrigation with effluent did not result in significant changes in soil pH, soil organic matter SOM, total kjeldahl nitrogen TKN, and dehydrogenase activity, whereas soil available P was found to increase in the upper soil layer.
Soil salinity varied slightly throughout the experiment in effluent irrigated pots but no change was detected at the end of the experiment compared to the initial value, suggesting sufficient salt leaching.
Pots irrigated with effluent had higher soil salinity, P, and dehydrogenase activity but lower SOM and TKN than freshwater irrigated pots.
Sunflower showed greater SOM and TKN values than castor bean suggesting differences between plant species in the microorganisms carrying out C and N mineralization in the soil. Plant species irrigated with freshwater achieved higher seed yield compared to those irrigated with effluent probably reflecting the lower level of soil salinity in freshwater irrigated pots.
- Kirjutatud toimetaja Liikumine on suurepärane viis keha ja vaimu tervena hoidmiseks.
- Kaal ja lihasmassi kaotus
Castor bean achieved greater seed yield than sunflower. Biodiesel production followed the pattern of seed yield.
The findings of this study suggest that wastewater effluent can constitute an important source of irrigation water and nutrients for bioenergy crop cultivations with minor adverse impacts on soil properties and seed yield. Plant species play an important role with regard to the changes in soil properties and to the related factors of.
