Abstract
A field experiment was conducted on a Trix clay loam at the Maricopa Agricultural Center to 1) determine the optimum rates of late season N needed to achieve optimum yield and quality of irrigated durum wheat in conjunction with varying rates of early season N, and 2) to evaluate the usefulness of stem NO₃⁻N analysis in predicting the late season N rates which optimize grain production but minimize the potential for nitrate pollution of groundwater. The application of 75, 150 and 300 lbs. N/a during vegetative growth resulted in wheat with highly deficient, slightly deficient and excessive N status at the boot stage as indicated by stem NO₃⁻N analysis. The application of 60 lbs. N/a at heading to highly N-deficient and slightly N-deficient wheat resulted in grain protein levels of 12.7 and 14.3 % respectively but had little effect on grain yield. Applications from 0 to 60 lbs. N /acre at heading to wheat which had previously received excessive N did not affect grain yield but did increase grain protein levels from 15.2 to 17.4 %. The use of stem NO₃⁻N analysis appears to be a useful tool in predicting the minimum N rate to be applied during the early reproductive period to insure acceptable levels of grain protein at harvest in cases where N status during the vegetative period was not highly deficient.
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Claims 9
Claim · model-written summary
Early nitrogen rate 75 produced highly deficient nitrogen status at boot stage.
- Taxon
- wheat
Triticum aestivume0t0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 75, 150 and 300 lbs. N/a during vegetative growth resulted in wheat with highly deficient, slightly deficient and excessive N status at the boot stage as indicated by stem NO₃⁻N analysis.”
t0“wheat”
Claim · model-written summary
Early nitrogen rate 150 produced slightly deficient nitrogen status at boot stage.
- Taxon
- wheatTriticum aestivume0t0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 75, 150 and 300 lbs. N/a during vegetative growth resulted in wheat with highly deficient, slightly deficient and excessive N status at the boot stage as indicated by stem NO₃⁻N analysis.”
t0“wheat”
Claim · model-written summary
Early nitrogen rate 300 produced excessive nitrogen status at boot stage.
- Taxon
- wheatTriticum aestivume0t0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 75, 150 and 300 lbs. N/a during vegetative growth resulted in wheat with highly deficient, slightly deficient and excessive N status at the boot stage as indicated by stem NO₃⁻N analysis.”
t0“wheat”
Claim · model-written summary
Late application of 60 lbs. N/a gave grain protein 12.7 in highly N-deficient wheat.
- Taxon
- wheatTriticum aestivume0t0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 60 lbs. N/a at heading to highly N-deficient and slightly N-deficient wheat resulted in grain protein levels of 12.7 and 14.3 % respectively but had little effect on grain yield.”
t0“wheat”
Claim · model-written summary
Late application of 60 lbs. N/a gave grain protein 14.3 % in slightly N-deficient wheat.
- Taxon
- wheatTriticum aestivume0t0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 60 lbs. N/a at heading to highly N-deficient and slightly N-deficient wheat resulted in grain protein levels of 12.7 and 14.3 % respectively but had little effect on grain yield.”
t0“wheat”
Claim · model-written summary
Late nitrogen had little effect on grain yield in deficient wheat.
- Taxon
- wheatTriticum aestivume0t0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 60 lbs. N/a at heading to highly N-deficient and slightly N-deficient wheat resulted in grain protein levels of 12.7 and 14.3 % respectively but had little effect on grain yield.”
t0“wheat”
Claim · model-written summary
Late nitrogen rates of 0 to 60 lbs. N/acre did not affect yield after excessive early nitrogen.
- Taxon
- wheatTriticum aestivume0
- Treatment
- 0 to 60 lbs. N /acre at headinge0
- Outcome
- grain yielde0
- Direction
- did not affecte0
- Qualifier
- previously received excessive Ne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applications from 0 to 60 lbs. N /acre at heading to wheat which had previously received excessive N did not affect grain yield”
Claim · model-written summary
Late nitrogen increased grain protein from 15.2 to 17.4% after excessive early nitrogen.
- Taxon
- wheatTriticum aestivume0
- Treatment
- 0 to 60 lbs. N /acre at headinge0
- Outcome
- grain protein levelse0
- Direction
- increasee0
- Value
- 15.2 to 17.4 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applications from 0 to 60 lbs. N /acre at heading to wheat which had previously received excessive N did not affect grain yield but did increase grain protein levels from 15.2 to 17.4 %.”
Claim · model-written summary
Stem nitrate analysis was judged useful for selecting minimum early reproductive nitrogen rates for acceptable protein when vegetative deficiency was not high.
- Taxon
- wheatTriticum aestivume0t0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of stem NO₃⁻N analysis appears to be a useful tool in predicting the minimum N rate to be applied during the early reproductive period to insure acceptable levels of grain protein at harvest in cases where N status during the vegetative period was not highly deficient.”
t0“wheat”
The same questions in other papers
nitrogen · molecular: expression · Triticum aestivum (wheat)Positive and negative results
25 papers in the same direction as this paper · 11 in the opposite direction
- negative
- positive
- no effect
33 papers more in this group
See all 37 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.