Abstract
Soil properties and weather conditions are known to affect soil N availability and plant N uptake; however, studies examining N response as affected by soil and weather sometimes give conflicting results. Meta‐analysis is a statistical method for estimating treatment effects in a series of experiments to explain the sources of heterogeneity. In this study, the technique was used to examine the influence of soil and weather parameters on N response of corn ( Zea mays L.) across 51 studies involving the same N rate treatments that were performed in a diversity of North American locations between 2006 and 2009. Results showed that corn response to added N was significantly greater in fine‐textured soils than in medium‐textured soils. Abundant and well‐distributed rainfall and, to a lesser extent, accumulated corn heat units enhanced N response. Corn yields increased by a factor of 1.6 (over the unfertilized control) in medium‐textured soils and 2.7 in fine‐textured soils at high N rates. Subgroup analyses were performed on the fine‐textured soil class based on weather parameters. Rainfall patterns had an important effect on N response in this soil texture class, with yields being increased 4.5‐fold by in‐season N fertilization under conditions of “abundant and well‐distributed rainfall.” These findings could be useful for developing N fertilization algorithms that would prescribe N application at optimal rates taking into account rainfall pattern and soil texture, which would lead to improved crop profitability and reduced environmental impacts.
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The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Corn nitrogen response was significantly greater in fine than medium textured soils.
- Taxon
- corn
Zea mays subsp. mayse0 - Outcome
- corn response to added Ne0
- Direction
- greatere0
- Comparator
- medium‐textured soilse0
- Setting
- fine‐textured soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn response to added N was significantly greater in fine‐textured soils than in medium‐textured soils”
Claim · model-written summary
Abundant well distributed rainfall enhanced corn nitrogen response.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- N responsee0
- Direction
- enhancede0
- Setting
- Abundant and well‐distributed rainfalle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Abundant and well‐distributed rainfall and, to a lesser extent, accumulated corn heat units enhanced N response”
e1“corn response to added N”
Claim · model-written summary
Accumulated corn heat units enhanced nitrogen response to a lesser extent.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- N responsee0
- Direction
- enhancede0
- Setting
- accumulated corn heat unitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Abundant and well‐distributed rainfall and, to a lesser extent, accumulated corn heat units enhanced N response”
Claim · model-written summary
High nitrogen rates increased corn yield 1.6-fold over unfertilized controls in medium textured soils.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- high N ratese1
- Outcome
- Corn yieldse0
- Direction
- increasede0
- Value
- a factor of 1.6e0
- Comparator
- unfertilized controle0
- Setting
- medium‐textured soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn yields increased by a factor of 1.6 (over the unfertilized control) in medium‐textured soils”
e1“at high N rates”
Claim · model-written summary
High nitrogen rates increased corn yield 2.7-fold over unfertilized controls in fine textured soils.
- Taxon
- CornZea mays subsp. mayse1
- Treatment
- high N ratese0
- Outcome
- Corn yieldse1
- Direction
- increasede1
- Value
- 2.7e0
- Comparator
- unfertilized controle1
- Setting
- fine‐textured soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“2.7 in fine‐textured soils at high N rates”
e1“Corn yields increased by a factor of 1.6 (over the unfertilized control)”
Claim · model-written summary
In fine textured soil with abundant well distributed rainfall, in-season nitrogen fertilization increased corn yield 4.5-fold.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- in‐season N fertilizatione0
- Outcome
- yieldse0
- Direction
- increasede0
- Value
- 4.5‐folde0
- Setting
- abundant and well‐distributed rainfalle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yields being increased 4.5‐fold by in‐season N fertilization under conditions of “abundant and well‐distributed rainfall.””
e1“corn response to added N”
Claim · model-written summary
Authors propose rainfall and soil texture informed nitrogen algorithms for profitability and environmental benefit.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- N fertilization algorithms that would prescribe N application at optimal ratese0
- Qualifier
- rainfall pattern and soil texturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“developing N fertilization algorithms that would prescribe N application at optimal rates taking into account rainfall pattern and soil texture”
e1“corn response to added N”
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See all 3,908 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.