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- Title
A Model of the Leaf Extension Rate of Tall Fescue in Response to Nitrogen and Temperature.
- Authors
GASTAL, F.; BELANGER, G.; LEMAIRE, G.
- Abstract
The leaf extension rate (LER) of tall fescue ( Schreb.) was studied in the field under various nitrogen and temperature regimes. The LER was closely related to temperature when N was not limiting plant growth. Two distinct relationships between the LER and the temperature were obtained, one for vegetative growth and one for the reproductive period. These relationships, described by a Gompertz function, were exponential at temperatures below 8 °C and linear at temperatures above 8 °C. They made possible the calculation of an optimal LER corresponding to non-limiting N conditions for plant growth. The strong influence of the temperature on the LER was still observed under N limiting conditions. The N status of the swards was described by the ratio between the actual N content (N) and the optimal N content (N). The N was defined as the N content experienced at a non-limiting level of N nutrition but without N luxury consumption. The N, expressed as a function of dry matter yield, declined during growth. The effect of the N status of the swards on the LER was analysed by calculating the ratio between the actual LER and the optimal LER, and relating it to the ratio between N and N. It was shown that these two ratios were highly correlated.
- Publication
Annals of Botany, 1992, Vol 70, Issue 5, p437
- ISSN
0305-7364
- Publication type
Article