Abstract
Abstract Split fertilizer N application has been proposed for improving N uptake efficiency in wheat ( Triticum aestivum L.) production systems, but results have been inconsistent. In this field study, 75 and 150 kg N ha −1 was applied either all preplant or in two, three, or four split applications based on wheat growth stage (GS) to determine N timing effect on wheat yield and apparent fertilizer N recovery. Vegetative samples were also collected at Feekes GS 4, 6, and 10 to determine treatment effects on tissue N concentration during the growing season. Soil samples were collected after harvest to evaluate residual N quantity and movement in soil relative to N rate and time of application. The soil used was a Fluventic Ustochrept‐Udic Chromustert intergrade. Nitrogen rate and application timing appeared to have less effect than year on yield and N parameters. Significant grain yield increases were achieved with split applications of N fertilizer when N was topdressed at GS 4 or 6 in 1989 as compared with all preplant or application at GS 10. Split N application at GS 10 produced greater grain yield than application at GS 4 or 6 in 1990. Nitrogen uptake efficiency was greatest with 75 kg N ha −1 and split application. Soil NO ‐ 3 –N concentration was significantly higher at 150 kg N ha −1 than at 75 kg N ha −1 . Significantly lower residual NO ‐ 3 ‐N with the preplant treatment was not accounted for by greater grain or straw N content.
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Claims 6
Claim · model-written summary
Year had more effect than nitrogen rate or application timing on yield and nitrogen parameters.
- Taxon
- Wheat
Triticum aestivumt0 - Outcome
- yield and N parameterse0
- Comparator
- yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rate and application timing appeared to have less effect than year on yield and N parameters”
t0“Wheat Production”
Claim · model-written summary
In 1989, split nitrogen application topdressed at growth stage 4 or 6 significantly increased grain yield relative to preplant application or growth stage 10.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- split applications of N fertilizer when N was topdressed at GS 4 or 6e0
- Outcome
- grain yielde0
- Direction
- increasese0
- Qualifier
- 1989e0
- Comparator
- all preplant or application at GS 10e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant grain yield increases were achieved with split applications of N fertilizer when N was topdressed at GS 4 or 6 in 1989 as compared with all preplant or application at GS 10”
t0“Wheat Production”
Claim · model-written summary
In 1990, nitrogen application at growth stage 10 yielded more grain than application at stage 4 or 6.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Split N application at GS 10e0
- Outcome
- grain yielde0
- Direction
- greatere0
- Qualifier
- 1990e0
- Comparator
- application at GS 4 or 6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Split N application at GS 10 produced greater grain yield than application at GS 4 or 6 in 1990”
t0“Wheat Production”
Claim · model-written summary
Nitrogen uptake efficiency was greatest with 75 kg N ha −1 and split application.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- 75 kg N ha −1 and split applicatione0
- Outcome
- Nitrogen uptake efficiencye0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen uptake efficiency was greatest with 75 kg N ha −1 and split application”
t0“Wheat Production”
Claim · model-written summary
Soil nitrate concentration was significantly higher at 150 than at 75 kg N ha −1.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- 150 kg N ha −1e0
- Outcome
- Soil NO ‐ 3 –N concentratione0
- Direction
- highere0
- Comparator
- 75 kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil NO ‐ 3 –N concentration was significantly higher at 150 kg N ha −1 than at 75 kg N ha −1”
t0“Wheat Production”
Claim · model-written summary
Preplant application left significantly less residual nitrate, without greater grain or straw nitrogen content accounting for it.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- preplant treatmente0
- Outcome
- residual NO ‐ 3 ‐Ne0
- Direction
- lowere0
- Qualifier
- not accounted for by greater grain or straw N contente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significantly lower residual NO ‐ 3 ‐N with the preplant treatment was not accounted for by greater grain or straw N content”
t0“Wheat Production”
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