Brennan determined that cover crop carbon/nitrogen
ratios increased through the winter and were always higher in rye than in the other two cover crops.
The straw from the different cultivars had notable differences in fiber composition and carbon/nitrogen
ratio of the soil humus remained unaffected by the addition of chemical fertilizer (nitrogen).
Over time, this causes an imbalance in the carbon/nitrogen
ratio, which inhibits the biological process and results in a significant increase in the total nitrogen load on the plant; greatly reducing plant efficiency.