Publication Date
1989
Description
Intercepted photosynthetically active radiation (PAR), lightuse efficiency and assimilate partitioning are three major determinants of crop growth (Charles-Edwards, 1982). Gastal and Lemaire (1988) reported that the amount of intercepted PAR partly explained the differences in aerial DM yield obtained with contrasting N regimes applied to a tall fescue sward. They also indicated that light-use efficiency and assimilate partitioning were involved in this N effect on DM yield but they could not differentiate between these two growth determinants. Very few field studies of the effect of a N deficiency on assimilate partitioning in forage grasses have been reported. Most studies conducted under controlled conditions or on fieldgrown spaced plants have shown that a N deficiency resulted in an increase in assimilate partitioning to the roots (Powell and Ryle, 1978; Gastal and Saugier, 1986). Colvill and Marshall (1981) reported that the assimilate supply to the roots was less in plants grown in a sward than in spaced plants. This field study was initiated to investigate the effect of N deficiency on C partitioning in a vegetative tall fescue sward.
Citation
Belanger, G; Gastal, F; and Warembourg, F R., "The Effect of Nitrogen Deficiency on Carbon Partitioning in a Tall Fescue Sward" (2025). IGC Proceedings (1989-2023). 81.
https://uknowledge.uky.edu/igc/1989/session1/81
Included in
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The Effect of Nitrogen Deficiency on Carbon Partitioning in a Tall Fescue Sward
Intercepted photosynthetically active radiation (PAR), lightuse efficiency and assimilate partitioning are three major determinants of crop growth (Charles-Edwards, 1982). Gastal and Lemaire (1988) reported that the amount of intercepted PAR partly explained the differences in aerial DM yield obtained with contrasting N regimes applied to a tall fescue sward. They also indicated that light-use efficiency and assimilate partitioning were involved in this N effect on DM yield but they could not differentiate between these two growth determinants. Very few field studies of the effect of a N deficiency on assimilate partitioning in forage grasses have been reported. Most studies conducted under controlled conditions or on fieldgrown spaced plants have shown that a N deficiency resulted in an increase in assimilate partitioning to the roots (Powell and Ryle, 1978; Gastal and Saugier, 1986). Colvill and Marshall (1981) reported that the assimilate supply to the roots was less in plants grown in a sward than in spaced plants. This field study was initiated to investigate the effect of N deficiency on C partitioning in a vegetative tall fescue sward.
