Available Online: http://www.ejpau.media.pl/volume19/issue4/abs-10.html
EFFECT OF COMPOSTED SEWAGE SLUDGE ON THE RATE OF C, N AND P MINERALIZATION IN SANDY SOIL
Monika Jakubus1, Małgorzata Graczyk2
1 Department of Soil Science and Land Protection, Poznań University of Life Sciences, Poland
2 Department of Mathematical and Statistical Methods, Poznań University of Life Sciences, Poland
Composting sewage sludge is an interesting alternative to recycling waste as a compost, the more such produced composts are valuable sources of nutrients and organic matter. Unfortunately, most of nutrients, and especially nitrogen and phosphorous are present in hardly available forms. As a result the rate of releasing of available nitrogen and phosphorus forms from compost may be slowly. The objective of this study was to evaluate changes in carbon, nitrogen and phosphorous mineralization in sandy soil incubated with two doses of composted sewage sludge (30 and 120 Mg per hectare) over period of 180 days. Carbon mineralization was determined by the measurement of soil respiration (CO2 emission). Besides, total carbon mineralization (TCM) and nitrification index (NI) were calculated. The data showed that with regard to the unamended soil, both the 30 and 120 Mg per hectare treatments similarly influenced on analyzed properties but the effect was more visible in the case of the higher compost dose. The dose of compost amounting to 120 Mg∙ha-1 caused considerable differences between the analysed parameters. Additionally it was found, that compost prepared on the basis of sewage sludge is an valuable fertilizer but at the same time slowly releases nutrients at available forms. For statistical testing, the analysis of variance and post-hoc examination were used.
Key words: analysis of variance, compost, total carbon mineralization (TCM), nitrification index (NI), available N and P.
Department of Soil Science and Land Protection, Poznań University of Life Sciences, Poland
Department of Mathematical and Statistical Methods, Poznań University of Life Sciences, Poland
Wojska Polskiego 28
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