SEWAGE SLUDGE IN SOIL FERTILITY, Brachiaria decumbens NUTRITION, AND DEHYDROGENASE ACTIVITY
DOI:
https://doi.org/10.5216/pat.v39i1.3319Keywords:
Microbial activity, pasture, biosolid, N mineralization.Abstract
In a greenhouse study, the effect of increasing doses of dry sewage sludge (class A), equivalent to 0 mg, 20 mg, 40 mg, and 80 mg of N dm-3 of soil, from the Franca sewage treatment plant (São Paulo State), was compared to the mineral nitrogen fertilization (40 kg urea ha-1). The experiment was conducted in 2005, using pots with 5 kg of an Oxisol, evaluating the soil fertility, nutrition of Brachiaria decumbens, and dehydrogenase activity. The experimental design was a completely randomized block, with four replications. The application of higher doses of sewage sludge increased the level of soil P by approximately 70%. The increased activity of dehydrogenase in soil showed significant correlation with increasing doses of sludge applied to soil. Only the highest dose of applied sludge (80 mg N dm-3 of soil) increased the dry weight shoot production, while all the doses of sludge applied to soil increased the N leaf content on Brachiaria decumbens.
KEY-WORDS: Microbial activity; pasture; biosolid; N mineralization.
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