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• W2045954429 abstract "Determining MZ (management zone)‐specific optimal N rate is a challenge in precision crop management. The objective of this study was to evaluate the potential of applying a crop growth model to simulate corn ( Zea mays L.) yield at various N levels in different MZs and estimate optimal N rates based on long‐term weather conditions. Three years of corn yield data were used to calibrate a modified version of the CERES‐Maize (Version 3.5) model for a commercial field previously divided into four MZs in eastern Illinois. The model performance in simulating corn yield for two hybrids (33G26 and 33J24) at five N levels in two independent years was evaluated. Economically optimum N rates (EONRs) were estimated based on 15 yr of simulation (1989–2003). The model explained approximately 59 and 93% of yield variability during calibration and validation, respectively. The model performed well at non‐zero N rates, with most of the simulation errors being <10%. Model‐estimated EONR varied from 70 to 250 kg ha −1 . Economic analyses indicated that applying N fertilizer at year‐, hybrid‐, and MZ‐specific EONR had the potential to increase net return by an average of US$49 (33G26) or US$52 (33J24) ha −1 over a URN (uniform rate N) application at 170 kg ha −1 . Applying average hybrid‐ and MZ‐specific EONRs across years did not consistently improve economic returns over URN application; however, applying the hybrid‐ and MZ‐specific N rates that maximized long‐term net returns would improve economic return by an average of US$22 (33G26) and US$14 (33J24) ha −1" @default.
• W2045954429 created "2016-06-24" @default.
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• W2045954429 date "2006-05-01" @default.
• W2045954429 modified "2023-10-02" @default.
• W2045954429 title "Evaluating Management Zone Optimal Nitrogen Rates with a Crop Growth Model" @default.
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• W2045954429 doi "https://doi.org/10.2134/agronj2005.0153" @default.
• W2045954429 hasPublicationYear "2006" @default.
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