CERES-maize predictions of maize phenology under nitrogenstressed conditions in Nigeria
| dc.creator | Gungula, D.T. | |
| dc.creator | Kling, J. | |
| dc.creator | Togun, A. | |
| dc.date | 2003-07 | |
| dc.date | 2018-05-17T09:02:45Z | |
| dc.date | 2018-05-17T09:02:45Z | |
| dc.date.accessioned | 2026-06-27T15:55:09Z | |
| dc.description | Simulation models have the potential of greatly enhancing decision-making by farmers and researchers in Nigeria. These models however, need to be adapted before use. This study was conducted to test the phenology module of CERES-Maize model version 3.5 under varying N rates as a step toward adapting the model in the Southern Guinea Savanna of Nigeria. Data on seven late-maturing cultivars of maize (Zea mays L.) grown under 0, 30, 60, 90, and 120 kg N ha−1 in the field for two seasons were used for running the model. There was a linear relationship between N rates and days to silking and maturity with R 2 values of > 0.70 for most of the cultivars, indicating that N strongly influenced phenology. Predictions of days to silking at high N rates (90 and 120 kg N ha−1) were close, with most prediction errors of <2 d. The highest deviations in the calibration results were 4 and 2 d for 90 and 120 kg N ha−1, respectively, while in the validation results, they were 1 and 2 d. Similarly, days to maturity were closely predicted by the model at high N rates with <2-d deviations for most predictions. At low N rates, however, there were greater deviations in model predictions. This shows that the CERES-Maize model can be reliably used for predicting maize phenology only under nonlimiting N conditions. Thus, a N stress factor needs to be incorporated into the model for more accurate phenology prediction in low-N tropical soils. | |
| dc.identifier | https://hdl.handle.net/10568/92586 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/117409 | |
| dc.language | en | |
| dc.publisher | Wiley | |
| dc.rights | Limited Access | |
| dc.source | Gungula, D.T., Kling, J. & Togun, A. (2003). CERESmaize predictions of maize phenology under nitrogenstressed conditions in Nigeria. Agronomy Journal, 95, 892-899. | |
| dc.subject | maize | |
| dc.subject | cultivars | |
| dc.subject | maize phenology model | |
| dc.title | CERES-maize predictions of maize phenology under nitrogenstressed conditions in Nigeria | |
| dc.type | Journal Article |