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Timothy Yield and Nutritive Value by the CATIMO Model

III. Validation for Eastern Canada

^a Norwegian Crop Res. Inst., Kvithamar Res. Cent., NO-7500 Stjordal, Norway
^b Soils and Crops Res. and Dev. Cent., Agric. and Agri-Food Canada, 2560 Hochelaga Boulevard, Sainte-Foy, QC, Canada G1V 2J3
^c Crop and Livestock Res. Cent., Agric. and Agri-Food Canada, Nappan, NS, Canada B0L 1C0
^d Soils and Crops Res. and Dev. Cent., Agric. and Agri-Food Canada, 1468 Saint-Cyrille St., Normandin, QC, Canada G8M 4K3
^e Atlantic Cool Climate Crop Res. Cent., Agric. and Agri-Food Canada, 308 Brookfield Road, St. John's, NF, Canada A1E 5Y7

View larger version (63K): [in a new window]   Fig. 1. Simplified diagram of the CATIMO model for the simulation of growth and nutritive value of timothy. T, temperature; PAR, photosynthetically active radiation; PET, potential evapotranspiration; RUE, radiation use efficiency.

View larger version (26K): [in a new window]   Fig. 2. Measured and simulated cumulative forage dry matter (DM) yield of timothy grown under limiting N conditions (open symbols, broken lines) and nonlimiting N conditions (closed symbols, solid line) in six separate experiments. N0, N4, N6, N7.5, N12, and N18 represent 0, 4, 6, 7.5, 12, and 18 g N m–2, respectively.

View larger version (19K): [in a new window]   Fig. 3. Simulated N concentration plotted against measured values for timothy grown under limiting (open symbols) and nonlimiting (closed symbols) N conditions in six separate experiments. DM, dry matter.

View larger version (15K): [in a new window]   Fig. 4. Measured (symbols) and simulated (lines) leaf weight ratio (LWR) of timothy grown at Nappan in 1997 and 1998. The parameter "a" represents intercept, and the parameter "b" represents the slope of the linear regression between simulated and measured values. RMSE, root mean square error of the prediction; RMSEn, normalized RMSE, calculated as RMSE divided by the average value of the attribute.

View larger version (21K): [in a new window]   Fig. 5. Simulated forage in vitro true dry matter digestibility (IVTD), cell wall (CW) digestibility, and CW concentration plotted against measured values for timothy grown under nonlimiting and limiting N conditions in six separate experiments. DM, dry matter.