Abstract
Organic wastes treated, used on agricultural land, can replace inorganic fertilizers, due to physical and chemical properties that improve soil and crop quality on long-term. In this study, was used biochar produced from sewage sludge, compost obtained from cattle manure, and mixtures made from biochar-compost in different concentration, at 5 t/ha and 30 t/ha, application rates. The aim of the study is to determine the influence of this organic wastes on the heavy metals bioavailability in greenhouse conditions and on Folsomia candida and Eisenia Andrei, used as test organisms under laboratory conditions. Compared to control variants, the use of biochar mixed with compost in different concentration at 5 t/ha and 30 t/ha, application rates, in a greenhouse experiment did not significantly affect the concentrations of heavy metals (Cu, Cd, Zn and Pb). Reproduction of collembolans has not been influenced by increasing application rate of the mixtures, and by concentrations of biochar or compost. The earthworms recorded weight losses, only in the experimental treatments with sewage sludge biochar used in different concentrations, at both application rates.
Highlights
The use of organic wastes on agricultural lands is very important, because it reduces the volume of landfilled waste, contributing to the policy on waste disposal and achieving recycling targets in Europe, and because this wastes can improves soil fertility [1]
The use of biochar mixed with compost as a soil amendment, can have an excellent agronomic value compared to the use of biochar alone, because its influences soil properties such as physical structure, fertility, microbial activity, crop growth, and bioavailability of nutrients and toxic compounds [3, 4]
In this study was used sewage sludge biochar mixed with cattle manure compost in different concentrations, at 5 t/ha and 30 t/ha application rates, with the aim to determine the influence of this organic wastes on heavy metals concentration in a greenhouse experiment
Summary
ELENA GOLDAN1, VALENTIN NEDEFF1,2*, NARCIS BARSAN1, EMILIAN MOSNEGUTU1, ANDREI VICTOR SANDU3,4, MIRELA PANAINTE1 1Vasile Alecsandri University of Bacau, Faculty of Engineering, 157 Marasesti Str., 600115 Bacau, Romania 2 Gheorghe Ionescu Sisesti Academy of Agricultural an Forest Sciences, 61 Marasti Str., 011464, Bucharest, Romania. The aim of the study is to determine the influence of this organic wastes on the heavy metals bioavailability in greenhouse conditions and on Folsomia candida and Eisenia Andrei, used as test organisms under laboratory conditions. The use of biochar mixed with compost in different concentration at 5 t/ha and 30 t/ha, application rates, in a greenhouse experiment did not significantly affect the concentrations of heavy metals (Cu, Cd, Zn and Pb). In this study was used sewage sludge biochar mixed with cattle manure compost in different concentrations, at 5 t/ha and 30 t/ha application rates, with the aim to determine the influence of this organic wastes on heavy metals concentration in a greenhouse experiment. Was determined the influence of sewage sludge biochar mixed with cattle manure compost, using the same concentrations and application rates, on the test organisms, Folsomia candida and Eisenia Andrei, in laboratory conditions
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