Use of irradiated sewage sludge as fertilizer for oats and maize
1998
Dumitru, M. | Motelica, D. M. | Alexandrescu, Adriana | Plaxienco, Doina | Gament, Doina | Dumitru, Elisabeta | Vrinceanu, Nicoleta | Calciu, I (Institutul de Cercetari pentru Pedologie si Agrochimie, Bucuresti (Romania)) | Prodan, Ioana | Prodan, N. (Statiunea de Cercetari Agricole, Teleorman (Romania))
Research was organised in field with irradiated and non-irradiated sewage sludge on a Haplic Phaeozem using oats and maize as test crops. The experiments were set up in the field according to a complete randomized block design with 10 treatments. The sewage sludge used in the experiments was taken from the waste water treatment plant of Pitesti. The application of a 10t/ha dose of sludge led to an increase tendency of oats and maize yield. The percentage of nitrogen from fertilizers which is used by oat crops was reduced (3.6-4.4 per cent), irrespective of irradiated or non-irradiated sludge application. The application of sludge did not cause significant changes in soil chemical characteristics. No important accumulations of heavy metals in oat and maize plants were observed. The zinc concentrations of oat straws and the cadmium concentrations of oat grains were lower in the treatments with irradiated sludge as compared to those with non-irradiated sludge. The data obtained allow to take into consideration the possibility of using municipal sludge as fertilizer in agriculture, with low negative effects on environmental quality.
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