Abstract
Hulless barley (Hordeum vulgare L.) is higher in energy density and protein than hulled barley but management recommendations for this new crop are lacking. Intensively managed hulled barley receives two spring nitrogen (N) applications. How this will affect winter hulless barley yield and protein is unknown. ‘Doyce’ hulless barley was planted following corn (Zea mays L.) at seven site-years in the Coastal Plain of Virginia from 2005 to 2007. Spring N was applied as urea ammonium nitrate (UAN, 30% N) in an incomplete factorial of treatments at Zadoks growth stage (GS) 25 and 30 broadcast at rates of 0, 45, 67, and 89 kg N ha−1. Six kg ha−1 of phosphorus (P) was foliar applied at GS 30 to treatments receiving 45:45 (45 kg N ha−1 at GS 25 and 45 kg N ha−1 at GS 30) and 45:67 N splits. Additionally, 34 kg N ha−1 as UAN was applied at GS 45 to treatments previously receiving either 45:45 or 45:67. Grain test weight increased with increasing N rate verifying that high spring N rates can be applied without negatively impacting grain test weight in this environment. Grain protein responded positively to increasing N rates as additional N at GS 45 increased protein by 0.7%. To maximize yields, 112 kg N ha−1 applied as 45 kg N ha−1 at GS 25 and 67 kg N ha−1 at GS 30 was necessary. Supplying the majority of spring N need at GS 30 proved important to matching barley N demand and achieving high yields.
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Claims 5
Claim · model-written summary
Grain test weight increased with increasing nitrogen rate.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- increasing N ratee0
- Outcome
- Grain test weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Grain test weight increased with increasing N rate”
t0“BARLEY”
Claim · model-written summary
Grain protein responded positively to increasing nitrogen rates.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- increasing N ratese0
- Outcome
- Grain proteine0
- Direction
- responded positivelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain protein responded positively to increasing N rates”
t0“BARLEY”
Claim · model-written summary
Additional nitrogen at GS 45 increased grain protein by 0.7%.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- additional N at GS 45e0
- Outcome
- proteine0
- Direction
- increasede0
- Value
- 0.7%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“additional N at GS 45 increased protein by 0.7%”
t0“BARLEY”
Claim · model-written summary
A 112 kg N ha−1 split of 45 kg at GS 25 and 67 kg at GS 30 was necessary to maximize yield.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- 112 kg N ha−1 applied as 45 kg N ha−1 at GS 25 and 67 kg N ha−1 at GS 30e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To maximize yields, 112 kg N ha−1 applied as 45 kg N ha−1 at GS 25 and 67 kg N ha−1 at GS 30 was necessary”
t0“BARLEY”
Claim · model-written summary
Supplying most spring nitrogen at GS 30 matched barley nitrogen demand and achieved high yields.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- Supplying the majority of spring N need at GS 30e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supplying the majority of spring N need at GS 30 proved important to matching barley N demand and achieving high yields”
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