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Article
2024
Evaluation of crop model-based simplified marginal net return maximising nitrogen application rates on site-specific level in maize
Evaluation of crop model-based simplified marginal net return maximising nitrogen application rates on site-specific level in maize
Abstract (English)
Crop growth models such as DSSAT-CERES-Maize have proven to be useful for analysing plant growth and yield within homogenous land units. The paper presents results of newly developed model-based site-specific Soil Profile Optimisation (SPO) tools in combination with an updated version of an already published Nitrogen Prescription Model (NPM). Site-specific soil profiles were generated through an inverse modelling approach based on measured site-specific yield (point-based) and tops weight (above-ground biomass time-series) and evaluated. Site-specific soil profiles generated based only on measured yield variability were able to explain 72% (R 2 0.72) of yield variability (dependent variable) based on selected soil profile input parameters (independent variable). Site-specific soil profiles generated based on measured yield and tops variability simultaneously (multiple target variable) explained 68% of yield variability (R 2 0.68). The NPM uses the SPO generated site-specific soil profiles for economic evaluation of site-specific N application rates. NPM simulated N application rates, aiming at the maximisation of marginal net return (MNR) were 25% lower compared to the uniform N application rates with an assumed grain and N price of 0.17 and 0.3 Euro kg −1 respectively, under rainfed conditions over three years based on soil profiles generated via an inverse modelling approach only from measured yield variability (one target variable). N application rates were 28% lower when based on soil profiles generated from simultaneously included grain and tops variability in the inverse modelling approach. The results highlight the importance of site-specific fertilizer management when maximising MNR.
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Precision agriculture, 25 (2024), 6, 2721-2739.
https://doi.org/10.1007/s11119-024-10126-z.
ISSN: 1573-1618
New York : Springer US
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Memic, E., Trenz, J., Heshmati, S., & Graeff, S. (2024). Evaluation of crop model-based simplified marginal net return maximising nitrogen application rates on site-specific level in maize. Precision agriculture, 25(6). https://doi.org/10.1007/s11119-024-10126-z
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English
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630 Agriculture
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Sustainable Development Goals
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@article{Memic2024,
doi = {10.1007/s11119-024-10126-z},
author = {Memic, E. and Trenz, J. and Heshmati, S. et al.},
title = {Evaluation of crop model-based simplified marginal net return maximising nitrogen application rates on site-specific level in maize},
journal = {Precision Agriculture},
year = {2024},
volume = {25},
number = {6},
pages = {2721--2739},
}