Published in Scientific Papers. Series A. Agronomy, Vol. LXVI, Issue 2
Written by Eusebiu SAFTA, Leonard ILIE
The compost obtained from the sludge from wastewater treatment, being an important source of macro and micronutrients, can be used in agriculture, because it reduces the production costs and improves the quality of the soil through the supply of nutrients and organic matter necessary for the practice of modern, ecological agriculture, under the conditions of improving the capacity to retain moisture in the soil, also reducing the pressure on the environment generated by the storage of these wastes. The compost used in the experiments is suitable for use in agriculture without risks of environmental and soil pollution, in compliance with the norms in force. The obtained results highlight the fact that by applying compost, even in the variants where the highest doses were applied (60 t/ha), there are no significant changes in the chemical properties of the soil, especially in the content of heavy metals. The values determined in the soil after applying the compost to all the tested variants are far below the maximum values allowed for the concentrations of heavy metals in the soil. Also, analyzing the results regarding the risk of translocation of the different chemical elements in the pea grains, it can be seen that, in general, all the indicators register values far below the limits from which zootoxicity phenomena can occur. There was no increase in the content of heavy metals in the pea grains, as the doses of compost used increased.
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