1. Influence of Nitrogen Rate Application on Soil Fertility in Four Long Term Experiments Sites

Total organic carbon (TOC) and total nitrogen (TN) are the most important components of the soil as they are key indicators of its quality and productivity. Nitrogen fertilization is an effective management practice for improving and maintaining soil fertility and enhancing crop productivity. The objective of this study is to determine the effect of different Nitrogen rate application on SOC and TN. This study was carried out in four separate long-term sites across Oklahoma State, established... M. Maatougui, B. Arnall