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Timothy Yield and Nutritive Value by the CATIMO Model

I. Growth and Nitrogen

^a Norwegian Crop Res. Inst., Kvithamar Res. Cent., NO-7500 Stjordal, Norway
^b Soils and Crops Res. and Dev. Cent., Agric. and Agri-Food Can., 2560 Hochelaga Blvd., Sainte-Foy, QC, Canada G1V 2J3

View larger version (25K): [in a new window]   Fig. 1. Measured and simulated DM yield of leaves and stems of timothy grown under nonlimiting N conditions in four separate experiments. The data come from three cultivars in 1991, two cultivars in 1992, and one cultivar in 1993 and 1995.

View larger version (14K): [in a new window]   Fig. 2. Measured and simulated DM yield of leaves and stems of timothy cv. Champ grown under two levels of N limiting conditions in 1993 (N0, 0 g N m-2; N7, 7 g N m-2).

View larger version (20K): [in a new window]   Fig. 3. Measured and simulated N concentration of timothy grown under limiting and nonlimiting N conditions. The model was calibrated to the 1993 measurements.

View larger version (19K): [in a new window]   Fig. 4. Simulated LAI and DM yield plotted as a function of measured values of timothy grown under nonlimiting and limiting N conditions in four separate experiments.