Abstract
Agricultural management is a viable way for recycling animal residues in feedlots. Thesubstances that make up organic residues change the dynamics of the organic matter decompositionin the soil. Information on carbon mineralization curves allows seeking improvements in soil qualityand, consequently, in crop productivity. The Stanford & Smith Nonlinear Model is the most usedto describe C mineralization of organic residues in the soil. This model considers organic residuesare composed of substances that are mineralized exponentially. The Cabrera Model considers twofractions, one composed of substances that are mineralized exponentially and other composed ofmore resistant substances with constant mineralization. The objective of this work was to comparenonlinear models that describe carbon mineralization, considering residues on surface or incorporatedinto the soil. The data evaluated were from an experiment with oat straw, liquid swine manure, andswine litter bedding. The Stanford & Smith and Cabrera Models were used considering structure offirst order autoregressive errors - AR(1), when necessary. The fittings were compared using the AkaikeInformation Criterion (AIC). The Cabrera Model was more adequate to describe C mineralization infour treatments (soil + incorporated liquid swine manure; soil + oat straw on surface + liquid swinemanure on surface; soil + incorporated straw; and soil + straw on surface). The Stanford & SmithModel was better in three treatments (soil + incorporated straw + incorporated liquid swine manure;swine litter bedding on surface; and incorporated swine litter bedding). None of the models describedthe treatment soil + liquid swine manure on surface.Keywords: Decomposition. Half-life. Stanford & Smith Model. Cabrera Model.
Highlights
Swine farming is an economic activity with high polluting potential due to the large amount of waste generated, and reducing the impact of its disposal in the environment is a challenge
The objective of the present work was to describe CO2 mineralization curves, based on the percentage of mineralized carbon from oat straw and swine manure applied to the soil surface or incorporated into the soil
SW test was significant for the OS+liquid swine manure (LSM)-I and OS-S treatments when fitted by the Stanford & Smith Model and Cabrera Model, respectively
Summary
Swine farming is an economic activity with high polluting potential due to the large amount of waste generated, and reducing the impact of its disposal in the environment is a challenge. Agricultural management is a viable alternative for recycling swine manure, it requires information on its effects on the decomposition rate of crop residues over time. Studies on sustainability of agricultural production systems emphasize the importance of soil management practices and their impacts on soil biological and biochemical properties (MERCANTE, 2001). Environmental issues related to wastes from production systems and strategic recycling practices for rational conduction and sustainability of the activity have worried researchers and rural producers (COSTA et al, 2009; SILVA; PINTO, 2010)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
