An Evaluation of Fertilizer and Soil Nitrogen Uptake by Wheat

Abstract Nitrogen utilization and uptake patterns of wheat was studied using 15N labelled fertilizer at four rates of application. Plants harvested at maximum tillering and at flowering indicated that plant N levels stabilized with time. Fertilizer N uptake and utilization of added fertilizer increased with time. However, uptake of soil N was not affected by rates of fertilizer at early stages. Increases were observed only at higher rates at the later harvest.