Abstract
Organic nitrogen mineralization is one of the main factors that determine the amounts of swine wastewater (SW) applicable in soils. The objective of the present work was to evaluate potentially mineralizable organic nitrogen (PMON) in soil treated with SW under different conditions of temperature and water contents. Latosol samples were mixed with SW in amount corresponding to 400 kg ha-1 of nitrogen and incubated at four different temperatures and water contents. Based on the values of the mineralized nitrogen concentration, the PMON was determined through the adjustment of a simple exponential model and through the estimated values of the potential model. The concentration of PMON using the simple exponential model varied from 73.85 to 207.16 mg kg-1, while for the potential model it varied from 79.01 to 226.40 mg kg-1. For both models the half-time of PMON for temperatures of 15, 20 and 25 °C was small in the lower water contents, while for the temperature of 35 °C it was small in the largest water contents.
Key words:
swine dejects; residue disposal; mineralization models; organic fertilizer
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