TY - JOUR AU - Silva, Edilson Marcelino AU - Ribeiro, Thais Destefani AU - Fernandes, Jaqueline Gonçalves AU - Muniz, Joel Augusto PY - 2019/09/06 Y2 - 2024/03/28 TI - Description of the carbon mineralization of swine manure and oat straw in the soil through nonlinear models JF - Revista Agrogeoambiental JA - R. Agrogeoambiental VL - 11 IS - 2 SE - DO - 10.18406/2316-1817v11n220191299 UR - https://agrogeoambiental.ifsuldeminas.edu.br/index.php/Agrogeoambiental/article/view/1299 SP - AB - <p>Agricultural management is a viable way for recycling animal residues in feedlots. The<br />substances that make up organic residues change the dynamics of the organic matter decomposition<br />in the soil. Information on carbon mineralization curves allows seeking improvements in soil quality<br />and, consequently, in crop productivity. The Stanford &amp; Smith Nonlinear Model is the most used<br />to describe C mineralization of organic residues in the soil. This model considers organic residues<br />are composed of substances that are mineralized exponentially. The Cabrera Model considers two<br />fractions, one composed of substances that are mineralized exponentially and other composed of<br />more resistant substances with constant mineralization. The objective of this work was to compare<br />nonlinear models that describe carbon mineralization, considering residues on surface or incorporated<br />into the soil. The data evaluated were from an experiment with oat straw, liquid swine manure, and<br />swine litter bedding. The Stanford &amp; Smith and Cabrera Models were used considering structure of<br />first order autoregressive errors - AR(1), when necessary. The fittings were compared using the Akaike<br />Information Criterion (AIC). The Cabrera Model was more adequate to describe C mineralization in<br />four treatments (soil + incorporated liquid swine manure; soil + oat straw on surface + liquid swine<br />manure on surface; soil + incorporated straw; and soil + straw on surface). The Stanford &amp; Smith<br />Model was better in three treatments (soil + incorporated straw + incorporated liquid swine manure;<br />swine litter bedding on surface; and incorporated swine litter bedding). None of the models described<br />the treatment soil + liquid swine manure on surface.</p><p><br /><strong>Keywords</strong>: Decomposition. Half-life. Stanford &amp; Smith Model. Cabrera Model.</p> ER -