Abstract
Abstract The profitability of fertilizer‐N use can be optimized using N response functions specific to climate‐based technology extrapolation domains (TED). Crop growth simulation can complement field research for targeting of response functions. The objective of this study was to target maize ( Zea mays L.) N response functions to seven TED in Ethiopia through CERES‐Maize simulation of continuous maize over 30 yr. The complete factorial set of treatments included seven levels of N in 25 kg ha −1 increments under no‐till (NT) and conventional tillage (CT) systems. The CERES‐Maize simulated experiments were done for two or three sites per TED. Nitrogen response functions were generated for each TED with tillage‐specific functions for three TED with tillage × N interactions. The N rate responses for all TED fit curvilinear to plateau functions but with differing magnitudes and shapes of response. The mean yield with NT was 6% less than with CT, but the difference declined with increased N rate. The economically optimum N rate (EONR) ranged from 65 to 179 and 103 to 243 kg ha −1 for high and low‐cost fertilizer‐N, respectively. The EONR was 6% less and the profit cost ratio was 11% higher with CT compared to NT, indicating greater fertilizer‐N need with NT than with CT. The application of N for maize was highly profitable for all TED. The EONR from CERES‐Maize were higher than past field research results. This suggests that the CERES‐Maize N response functions were most appropriate for well‐managed crop production situations in Ethiopia.
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Claims 9
Claim · model-written summary
The maize N rate responses in all technology extrapolation domains fit curvilinear to plateau functions with differing magnitudes and shapes.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“target maize ( Zea mays L.) N response functions”
e1“The N rate responses for all TED fit curvilinear to plateau functions but with differing magnitudes and shapes of response”
Claim · model-written summary
Simulated maize mean yield with no-till was 6% lower than with conventional tillage.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“target maize ( Zea mays L.) N response functions”
e2“The mean yield with NT was 6% less than with CT”
Claim · model-written summary
The simulated economically optimum N rate for high-cost fertilizer-N ranged from 65 to 179 kg ha-1 across domains.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“target maize ( Zea mays L.) N response functions”
e3“The economically optimum N rate (EONR) ranged from 65 to 179 and 103 to 243 kg ha −1 for high and low‐cost fertilizer‐N, respectively”
Claim · model-written summary
The simulated economically optimum N rate for low-cost fertilizer-N ranged from 103 to 243 kg ha-1 across domains.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“target maize ( Zea mays L.) N response functions”
e3“The economically optimum N rate (EONR) ranged from 65 to 179 and 103 to 243 kg ha −1 for high and low‐cost fertilizer‐N, respectively”
Claim · model-written summary
The simulated EONR with conventional tillage was 6% lower than with no-till.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“target maize ( Zea mays L.) N response functions”
e4“The EONR was 6% less and the profit cost ratio was 11% higher with CT compared to NT”
Claim · model-written summary
The simulated profit cost ratio with conventional tillage was 11% higher than with no-till.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“target maize ( Zea mays L.) N response functions”
e4“The EONR was 6% less and the profit cost ratio was 11% higher with CT compared to NT”
Claim · model-written summary
N application was highly profitable for maize in all technology extrapolation domains.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“target maize ( Zea mays L.) N response functions”
e5“The application of N for maize was highly profitable for all TED”
Claim · model-written summary
The EONR from CERES-Maize was higher than past field research results.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“target maize ( Zea mays L.) N response functions”
e6“The EONR from CERES‐Maize were higher than past field research results”
Claim · model-written summary
The CERES-Maize N response functions are most appropriate for well-managed crop production situations in Ethiopia.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“target maize ( Zea mays L.) N response functions”
e7“the CERES‐Maize N response functions were most appropriate for well‐managed crop production situations in Ethiopia”
The same questions in other papers
tillage · yield · Zea mays (maize)Positive and negative results
811 papers in the same direction as this paper · 230 in the opposite direction · 57 reporting no difference from an alternative
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- no effect
- negative
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