Increase in earth surface temperature and the outcomes take attention of scientists to find out the reasons. Green house gases especially carbon dioxide in atmosphere are known as the main reasons for this phenomena. Sources of carbon in agricultural soils are important factors in the global carbon cycle. These sources are in contact with atmosphere and act as a tool to control its carbon dioxide. The emission of carbon dioxide to atmosphere can be decreased with increase in carbon sources in soils. Increase in earth surface temperature and the outcomes take attention of scientists to find out the reasons. Green house gases especially carbon dioxide in atmosphere are known as the main reasons for this phenomena. Sources of carbon in agricultural soils are important factors in the global carbon cycle. These sources are in contact with atmosphere and act as a tool to control its carbon dioxide. The emission of carbon dioxide to atmosphere can be decreased with increase in carbon sources in soils. Soil carbon sequestration improves soil quality and limits the proportion of carbon dioxide emission of agricultural land to the atmosphere. Labile organic matter pools can be considered as fine indicators of soil quality that are very sensitive to changes in soil management practices.This research is conducted to evaluate the effects of compaction, moisture and farmyard manure on carbon sources soils. The structural characteristics of four different textured soils under corn cultivation in Isfahan University of Technology research green houses were also evaluated. Eight treatments with three replications in four soil texture (sandy loam, loam, clay loam and silty clay) are considered. Compaction treatment with 2 relative compaction levels of 0.83 and 0.91, moisture 70 and 90 percent of FC level and farmyard manure with zero and 25 ton per hectare levels were used. Corn (single cross cultivar) was planted and after three months plant and soil characteristics were analyzed. Organic matter, particulate organic matter (POM), acid hydrolysable carbohydrate (AHC) and mean weight diameter (MWD) were measured in soils. Results show that adding farmyard manure to the soil increased POM in all soil textures. In addition farmyard manure in fine and coarse texture increased the organic matter and AHC. Aggregate stability was increased by adding manure in all textures except for the silty clay texture. Soil POM was increased in coarse textures (loam and sandy loam) by increasing moisture Aggregate stability was increased in soils with coarse texture (sandy loam and loam) by increasing moisture. However in fine texture higher moisture content caused a reduction in aggregate stability. In addition increasing in relative compaction in coarse texture (loam and sandy loam) caused decline in aggregate stability but in the fine texture (silty clay and clay loam) a positive effect of relative compaction was see for aggregate stability increased