Abstract
The objective of this study was to investigate the root growth and nitrogen (N) accumulation of spring wheat during grain filling under split N management. Two spring wheat genotypes were grown in a field with sandy loam soils at three levels of N fertilization (18, 21, and 24 g N m−2). Variations in N availability across soil depth were performed in additional experiments under controlled conditions in a greenhouse. The accumulations of total and late-applied N at maturity were 13% and 41% greater, respectively, for the genotype that had longer root length (+57%) and root-to-shoot ratio (+43%). The accumulation of 15N in the greenhouse study was 53% greater with 15N applied at a depth of 0.15 m than at a depth of 0.35 m. These results indicate that the genotype that accumulated more N was characterized by greater proliferation and maintenance of roots where N availability was greater.
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