Abstract
Crop nitrogen (N) use is always affected by the variability in production environment. Dataset (2001 to 2014) from long-term winter wheat (Triticum aestivum L.) experiments at Lahoma and Stillwater, Oklahoma was used. Both experiments have a randomized complete block design with four replications, and fertilizer N was applied as urea pre-plant. Responsiveness of grain yield to maximum fertilizer N rate (112 kg ha−1 – Lahoma; 135 kg ha−1 – Stillwater) was compared with that from check plot (0 kg ha−1). The objective was to determine the relative influence of environment, management, and variety on winter wheat grain yield. The combined analysis of variance indicated that the main effect of year, treatment, location, and variety accounted for 29.3%, 21.2%, 3.1%, and 22.6%, respectively of the variance terms. Over the study period, the non-responsiveness of winter wheat to fertilizer N accounted for 29% and 23% of grain yield at Lahoma and Stillwater, respectively where yield at maximum N rate did not significantly differ from check plot. This highlights the importance of random changes in a crop production environment and its influence in dictating the response to applied N fertilizer. Nitrogen fertilizer losses could be reduced by adopting in-season variable N application techniques.
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Claims 8
Claim · model-written summary
Non-responsiveness of winter wheat to fertilizer N accounted for 29% of grain yield at Lahoma.
- Taxon
- winter wheat
Triticum aestivume1 - Treatment
- fertilizer Ne1
- Outcome
- non-responsiveness of winter wheat to fertilizer Ne1
- Value
- 29%e1
- Setting
- Lahomae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the non-responsiveness of winter wheat to fertilizer N accounted for 29% and 23% of grain yield at Lahoma and Stillwater, respectively”
Claim · model-written summary
Non-responsiveness of winter wheat to fertilizer N accounted for 23% of grain yield at Stillwater.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- fertilizer Ne1
- Outcome
- non-responsiveness of winter wheat to fertilizer Ne1
- Value
- 23%e1
- Setting
- Stillwatere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the non-responsiveness of winter wheat to fertilizer N accounted for 29% and 23% of grain yield at Lahoma and Stillwater, respectively”
Claim · model-written summary
Year accounted for 29.3% of the variance terms in the combined analysis of variance.
- Taxon
- winter wheatTriticum aestivume0
- Outcome
- variance termse2
- Value
- 29.3%e2
- Qualifier
- main effect of yeare2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dataset (2001 to 2014) from long-term winter wheat (Triticum aestivum L.) experiments at Lahoma and Stillwater, Oklahoma was used”
e2“The combined analysis of variance indicated that the main effect of year, treatment, location, and variety accounted for 29.3%, 21.2%, 3.1%, and 22.6%, respectively of the variance terms”
Claim · model-written summary
Treatment accounted for 21.2% of the variance terms in the combined analysis of variance.
- Taxon
- winter wheatTriticum aestivume0
- Outcome
- variance termse2
- Value
- 21.2%e2
- Qualifier
- main effect of year, treatment, location, and varietye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dataset (2001 to 2014) from long-term winter wheat (Triticum aestivum L.) experiments at Lahoma and Stillwater, Oklahoma was used”
e2“The combined analysis of variance indicated that the main effect of year, treatment, location, and variety accounted for 29.3%, 21.2%, 3.1%, and 22.6%, respectively of the variance terms”
Claim · model-written summary
Location accounted for 3.1% of the variance terms in the combined analysis of variance.
- Taxon
- winter wheatTriticum aestivume0
- Outcome
- variance termse2
- Value
- 3.1%e2
- Qualifier
- main effect of year, treatment, location, and varietye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dataset (2001 to 2014) from long-term winter wheat (Triticum aestivum L.) experiments at Lahoma and Stillwater, Oklahoma was used”
e2“The combined analysis of variance indicated that the main effect of year, treatment, location, and variety accounted for 29.3%, 21.2%, 3.1%, and 22.6%, respectively of the variance terms”
Claim · model-written summary
Variety accounted for 22.6% of the variance terms in the combined analysis of variance.
- Taxon
- winter wheatTriticum aestivume0
- Outcome
- variance termse2
- Value
- 22.6%e2
- Qualifier
- main effect of year, treatment, location, and varietye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dataset (2001 to 2014) from long-term winter wheat (Triticum aestivum L.) experiments at Lahoma and Stillwater, Oklahoma was used”
e2“The combined analysis of variance indicated that the main effect of year, treatment, location, and variety accounted for 29.3%, 21.2%, 3.1%, and 22.6%, respectively of the variance terms”
Claim · model-written summary
Yield at maximum N rate did not significantly differ from the check plot.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- maximum N ratee3
- Outcome
- yielde3
- Direction
- did not significantly differe3
- Comparator
- check plote3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dataset (2001 to 2014) from long-term winter wheat (Triticum aestivum L.) experiments at Lahoma and Stillwater, Oklahoma was used”
e3“yield at maximum N rate did not significantly differ from check plot”
Claim · model-written summary
Nitrogen fertilizer losses could be reduced by in-season variable N application techniques.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- in-season variable N application techniquese5
- Outcome
- Nitrogen fertilizer losses could be reducede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dataset (2001 to 2014) from long-term winter wheat (Triticum aestivum L.) experiments at Lahoma and Stillwater, Oklahoma was used”
e5“Nitrogen fertilizer losses could be reduced by adopting in-season variable N application techniques”
The same questions in other papers
nitrogen · yield · Triticum aestivum (wheat)Positive and negative results
323 papers in the same direction as this paper · 1,737 in the opposite direction
- positive
- no effect
- positive
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