Effects of foliar and root applied nitrogen on nitrogen uptake and movement in white clover at low temperature
Year: 2007
Type: article
Abstract: ‘Grasslands Huia’ white clover plants were grown at a constant root and shoot temperature of 8°C in a controlled environment room. Nitrate or urea labelled with 15 N was applied to the foliage, foliage plus the roots, or to the roots only. After 21 days, plants supplied with foliar nitrogen (N) or with N to the foliage plus roots, produced significantly ( P < 0.05) more lamina dry weight than plants supplied with N to the roots only. Plants supplied with N to the foliage contained significantly ( P < 0.05) more lamina 15 N than plants supplied with N to the foliage plus the roots or to the roots only. From 14 days onwards, plants supplied with foliar N, or N to the foliage plus the roots, had significantly ( P < 0.05) higher leaf areas than plants supplied with N to the roots only, irrespective of the form of N applied. By 21 days, plants supplied with foliar nitrate or urea had significantly ( P < 0.05) higher photosynthesis, transpiration, stomatal conductance rates, and lamina sucrose concentrations, than plants supplied with N to the roots. The experiment demonstrated the importance of N availability as a rate‐limiting factor on starch and sucrose synthesis and, in turn, on foliage growth at low temperatures in white clover.
Authors: M. L. Castle, J. R. Crush, J. S. Rowarth
Institutions: AgResearch, Unitec Institute of Technology, Massey University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
Funders: AgResearch, RMIT University
OpenAlex ID: W1969996010