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Publication Date
1989
Location
Nice France
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" (1989). IGC Proceedings (1985-2023). 81.
(URL: https://uknowledge.uky.edu/igc/1989/session1/81)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
The Effect of Nitrogen Deficiency on Carbon Partitioning in a Tall Fescue Sward
Nice France
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.
