Abstract
A field experiment was conducted on a Pima clay loam at the Safford 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) evaluate the usefulness of stern 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, 175 and 350 lbs. N/a during vegetative growth resulted in wheat with deficient, sufficient 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 N- deficient wheat and 15-20 lbs. N/a to N-sufficient wheat resulted in grain protein levels above 14 %, but the applications had little effecton grain yield. Applications of N at heading to wheat which had previously received excessive N did not affect grain yield or quality. The use of stein 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.
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Claims 5
Claim · model-written summary
Early nitrogen rates of 75, 175 and 350 lbs. N/a corresponded to deficient, sufficient and excessive boot-stage nitrogen status.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- 75, 175 and 350 lbs. N/a during vegetative growthe0
- Outcome
- deficient, sufficient and excessive N status at the boot stagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 75, 175 and 350 lbs. N/a during vegetative growth resulted in wheat with deficient, sufficient and excessive N status at the boot stage, as indicated by stem NO₃-N analysis.”
t0“Irrigated Durum Wheat”
Claim · model-written summary
Heading nitrogen raised grain protein above 14% in deficient and sufficient wheat.
- Taxon
- wheatTriticum aestivume0
- Treatment
- 60 lbs. N/a at heading to N- deficient wheat and 15-20 lbs. N/a to N-sufficient wheate0
- Outcome
- grain protein levelse0
- Direction
- abovee0
- Value
- 14 %e0
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 N- deficient wheat and 15-20 lbs. N/a to N-sufficient wheat resulted in grain protein levels above 14 %, but the applications had little effecton grain yield.”
t0“Irrigated Durum Wheat”
Claim · model-written summary
The heading applications had little effect on grain yield.
- Taxon
- wheatTriticum aestivume0
- Treatment
- 60 lbs. N/a at heading to N- deficient wheat and 15-20 lbs. N/a to N-sufficient wheate0
- Outcome
- grain yielde0
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 N- deficient wheat and 15-20 lbs. N/a to N-sufficient wheat resulted in grain protein levels above 14 %, but the applications had little effecton grain yield.”
t0“Irrigated Durum Wheat”
Claim · model-written summary
Heading nitrogen did not affect grain yield or quality in wheat previously given excessive nitrogen.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Applications of N at headinge0
- Outcome
- grain yield or qualitye0
- 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 of N at heading to wheat which had previously received excessive N did not affect grain yield or quality.”
t0“Irrigated Durum Wheat”
Claim · model-written summary
Stem nitrate analysis appeared useful for predicting minimum early reproductive nitrogen rates for acceptable grain protein.
- Taxon
- Irrigated Durum Wheat
Triticum turgidum subsp. durumt0 - Outcome
- predicting the minimum N ratee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of stein 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.”
t0“Irrigated Durum Wheat”
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