An Evaluation of Fertilizer and Soil Nitrogen Uptake by Wheat

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.