Abstract
ABSTRACT Selection of the nitrogen (N) source and rate for application is critical to ensure profitable wheat (Triticum aestivum L.) yields. The research objective was to evaluate several N sources and spring application rates for conservation tillage wheat production. Research was initiated in the fall of 1997 and continued through 2000 on Collins silt loam (Aquic Udifluvents). A different cultivar was seeded each of the three years. The experimental design was a split-plot with 0, 34, 67, 101, 134, and 168 kg N ha−1 rates the main plots and N sources (ammonium nitrate, urea, urea-ammonium nitrate, ammonium sulfate and UAN+Ca(NO3)2 co-mixture) the sub-plots. The yield response to N rate varied with year and N source. For the three years, yields were increased by applying either 67 or 101 kg N ha−1. Broadcasting AN produced higher yields than urea-containing N sources (urea or UAN) for two of the three years. Broadcasting urea or UAN restricted yields approximately 12% apparently due to N volatilization losses. Broadcasting AS was as effective as AN one of the two years while broadcasting the UAN+ Ca(NO3)2 co-mixture resulted in higher yields at a lower N rate than AN for one of two years. Yield differences due to N source were small when rainfall occurred within two days of soil application. Take-all root rot affected yield one of three years with AN and AS being more efficient N sources. Sulphur fertilization was not needed for wheat production on this soil.
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Claims 10
Claim · model-written summary
Applying 67 or 101 kg N ha−1 increased wheat yields.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- applying either 67 or 101 kg N ha−1e1
- Outcome
- yieldse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“profitable wheat (Triticum aestivum L.) yields”
e1“For the three years, yields were increased by applying either 67 or 101 kg N ha−1”
Claim · model-written summary
Broadcast AN gave higher wheat yields than urea-containing N sources in two of three years.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Broadcasting ANe1
- Outcome
- yieldse1
- Direction
- highere1
- Qualifier
- for two of the three yearse1
- Comparator
- urea-containing N sourcese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“profitable wheat (Triticum aestivum L.) yields”
e1“Broadcasting AN produced higher yields than urea-containing N sources (urea or UAN) for two of the three years”
Claim · model-written summary
Broadcast urea or UAN restricted wheat yields by approximately 12%, apparently due to N volatilization losses.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Broadcasting urea or UANe1
- Outcome
- yieldse1
- Direction
- restrictede1
- Value
- 12%e1
- Qualifier
- apparently due to N volatilization lossese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“profitable wheat (Triticum aestivum L.) yields”
e1“Broadcasting urea or UAN restricted yields approximately 12% apparently due to N volatilization losses”
Claim · model-written summary
The UAN+ Ca(NO3)2 co-mixture gave higher wheat yields than AN at a lower N rate in one of two years.
- Taxon
- wheatTriticum aestivume0
- Treatment
- UAN+ Ca(NO3)2 co-mixturee1
- Outcome
- yieldse1
- Direction
- highere1
- Qualifier
- at a lower N ratee1
- Comparator
- ANe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“profitable wheat (Triticum aestivum L.) yields”
e1“Broadcasting AS was as effective as AN one of the two years while broadcasting the UAN+ Ca(NO3)2 co-mixture resulted in higher yields at a lower N rate than AN for one of two years”
Claim · model-written summary
Broadcast AS was as effective as AN for wheat yields in one of two years.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Broadcasting ASe1
- Outcome
- yieldse1
- Direction
- no_changeinferrede1
- Qualifier
- one of the two yearse1
- Comparator
- ANe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“profitable wheat (Triticum aestivum L.) yields”
e1“Broadcasting AS was as effective as AN one of the two years while broadcasting the UAN+ Ca(NO3)2 co-mixture resulted in higher yields at a lower N rate than AN for one of two years”
Claim · model-written summary
Yield differences due to N source were small when rainfall occurred within two days of soil application.
- Taxon
- wheatTriticum aestivume0
- Treatment
- N sourcee1
- Outcome
- Yield differences due to N sourcee1
- Direction
- decreaseinferrede1
- Qualifier
- when rainfall occurred within two days of soil applicatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“profitable wheat (Triticum aestivum L.) yields”
e1“Yield differences due to N source were small when rainfall occurred within two days of soil application”
Claim · model-written summary
Take-all root rot affected wheat yield in one of three years.
- Taxon
- wheatTriticum aestivume0
- Interactor
- Take-alle1pathogen
- Outcome
- yielde1
- Qualifier
- one of three yearse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“profitable wheat (Triticum aestivum L.) yields”
e1“Take-all root rot affected yield one of three years with AN and AS being more efficient N sources”
Claim · model-written summary
AN and AS were more efficient N sources in the take-all year.
- Taxon
- wheatTriticum aestivume0
- Treatment
- AN and ASe1
- Outcome
- efficient N sourcese1
- Direction
- moree1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“profitable wheat (Triticum aestivum L.) yields”
e1“Take-all root rot affected yield one of three years with AN and AS being more efficient N sources”
Claim · model-written summary
The yield response to N rate varied with year and N source.
- Taxon
- wheatTriticum aestivume0
- Treatment
- N ratee1
- Outcome
- yield response to N ratee1
- Qualifier
- with year and N sourcee1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“profitable wheat (Triticum aestivum L.) yields”
e1“The yield response to N rate varied with year and N source”
Claim · model-written summary
Sulphur fertilization is not needed for wheat production on this soil.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Sulphur fertilizatione1
- Outcome
- Sulphur fertilization was not needede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Sulphur fertilization was not needed for wheat production on this soil”
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