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1 2005

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Fertilization value of the granulate made from sewage sludge

Wiater J., Żebranowicz E.J.

Polish Journal of Chemical Technology

2005

Vol. 7, nr 2

80-84

The granulated fertilizer made by the Institute of Chemical Coal Processing in Zabrze from municipal sewage sludge was used in the studies. The pot experiment was set on the lessive soil. The experimental scheme included: the control object (with no fertilization), the object with mineral fertilization, the object with the granulate (I - the dose corresponding to the NPK level with mineral fertilizers), II - the granulate dose increased by 50% relative to I, III - the dose by 100% higher than I. The following marker plants were used in the study: the naked oats and the white mustard. The granulate and the mineral fertilizers were once introduced in 2002. The plants were harvested at full of the flowering stage. In 2003, the same plants were sown to assess the secondary influence of the granulate on the yield size and the quality. The contents of nitrogen, phosphorus, potassium, magnesium and calcium were determined in the plant samples after wet digestion. On a basis of the harvested plant weight and the element contents, the amounts of their intake were calculated. It was found that the tested granulate affected the yield increase of both plants significantly, both in a direct and sequent action. The highest granulate dose had the most positive effect on the white mustard yielding, the lower doses - on the oat yields. The nitrogen and calcium levels in the oats and mustard plants were higher due to a direct granulate influence and that of magnesium - lower. The applied granulate in a direct and sequent action influenced in the same manner the phophorus content in both tested plants; the potassium level in oats, and potassium in a direct action in white mustard. Oats and white mustard had a much higher intake of nitrogen, calcium and potassium in the first year of study, as a result of a direct granulate action. In the sequent action, the granulate was more efficient referring to the intake of magnesium and phosphorus by oats. White mustard had equal intakes of phosphorus in the direct and the sequent action of the granulate.