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Influence of Nitrogen Fertilization on Multi-Cut Forage Sorghum–Sudangrass Yield and Nitrogen Use

^a Southern Crop Protection & Food Research Centre, 1391 Sandford Street, London, ON, Canada, N5T 4T3
^b P.O. Box 186, Delhi, ON, Canada, N4B 2W9

View larger version (26K): [in a new window]   Fig. 1. Relationship between dry matter yield and fertilizer N application for (a) first cut, (b) second cut, (c) third cut, and (d) cumulative harvests of sorghum–sudangrass. Data points are the mean ±SE of the number of experimental units indicated. Calculated variation of dry matter yield response for the model is expressed as the root mean square error (RMSE).

View larger version (31K): [in a new window]   Fig. 2. Relationship between N concentration [N] and fertilizer N application for (a) first cut, (b) second cut, (c) third cut, and (d) cumulative harvests of sorghum–sudangrass. Data points are the mean ±SE of the number of experimental units indicated. Calculated variation of [N] response for the model is expressed as the root mean square error (RMSE).

View larger version (31K): [in a new window]   Fig. 3. Relationship between N accumulation (NA) and fertilizer N application for (a) first cut, (b) second cut, (c) third cut, and (d) cumulative harvests of sorghum-sudangrass. Data points are the mean ±SE of the number of experimental units indicated. Calculated variation of N accumulation response for the model is expressed as root mean square error (RMSE).

View larger version (37K): [in a new window]   Fig. 4. Relationship between nitrogen use efficiency (NUE) and fertilizer N application for (a) first cut, (b) second cut, (c) third cut, and (d) cumulative harvests of sorghum–sudangrass. Data points are the mean ±SE of the number of experimental units indicated. Calculated variation of NUE response for the model is expressed as the root mean square error (RMSE).

View larger version (30K): [in a new window]   Fig. 5. Relationship between apparent nitrogen recovery (ANR) and fertilizer N application for (a) first cut, (b) second cut, (c) third cut, and (d) cumulative harvests of sorghum–sudangrass. Data points are the mean ±SE of the number of experimental units indicated. Calculated variation of ANR response for the model is expressed as the root mean square error (RMSE).