Abstract
A field experiment was conducted to examine the interaction of fertilizer placement and moisture level on barley (Hordeum vulgare 'Gait') utilization of urea-N during early growth. The 15 N labelled urea (50 kg ha −1 ) was either deep-banded or broadcast-incorporated, and plant samples were taken from the two-leaf stage until anthesis, then again at maturity. Five moisture regimes were created using rain shelters, with 0, 10, 15, 20 and 25 mm water applied per week until anthesis. A natural precipitation treatment was also included. All barley plants were unsheltered from anthesis to maturity. Weekly fertilizer recoveries by the crop with no water additions were much less for broadcast-incorporated N than deep placement. The differences narrowed with increasing rates of water additions. Apparently, broadcast-incorporated fertilizer N remained in dry surface layers of the no-water treatment, and was positionally unavailable for absorption by the crop. Compared to deep-banded N, broadcast-incorporated N resulted in 37% less grain when drought stress occurred from seeding to anthesis. Broadcast-incorporated N was more susceptible to immobilization by the soil than was deep-banded N. Key words: Barley, drought stress, 15 N-urea, fertilizer positional unavailability, N immobilization
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Claims 5
Claim · model-written summary
Without water additions, weekly fertilizer recovery by the barley crop was much lower with broadcast-incorporated N than with deep placement.
- Taxon
- BARLEY
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- broadcast-incorporated Ne0
- Outcome
- fertilizer recoveries by the crope0
- Direction
- much lesse0
- Qualifier
- with no water additionse0
- Comparator
- deep placemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“BARLEY”
e0“Weekly fertilizer recoveries by the crop with no water additions were much less for broadcast-incorporated N than deep placement”
Claim · model-written summary
Under drought from seeding to anthesis, broadcast-incorporated N gave 37% less grain than deep-banded N.
- Taxon
- BARLEYHordeum vulgaret0
- Treatment
- broadcast-incorporated Ne2
- Outcome
- graine2
- Direction
- lesse2
- Value
- 37%e2
- Qualifier
- when drought stress occurred from seeding to anthesise2
- Comparator
- deep-banded Ne2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BARLEY”
e2“Compared to deep-banded N, broadcast-incorporated N resulted in 37% less grain when drought stress occurred from seeding to anthesis”
Claim · model-written summary
Broadcast-incorporated N was more susceptible to soil immobilization than deep-banded N.
- Taxon
- BARLEYHordeum vulgaret0
- Treatment
- broadcast-incorporated Ne3
- Outcome
- immobilization by the soile3
- Direction
- more susceptiblee3
- Comparator
- deep-banded Ne3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BARLEY”
e3“Broadcast-incorporated N was more susceptible to immobilization by the soil than was deep-banded N”
Claim · model-written summary
Broadcast-incorporated N apparently remained in dry surface layers in the no-water treatment and was therefore unavailable for crop absorption.
- Taxon
- BARLEYHordeum vulgaret0
- Outcome
- absorption by the crope4
- Qualifier
- remained in dry surface layers of the no-water treatmente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BARLEY”
e4“Apparently, broadcast-incorporated fertilizer N remained in dry surface layers of the no-water treatment, and was positionally unavailable for absorption by the crop”
Claim · model-written summary
The differences between placements narrowed as water additions increased.
- Taxon
- BARLEYHordeum vulgaret0
- Treatment
- increasing rates of water additionse1
- Outcome
- differencese1
- Direction
- narrowede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BARLEY”
e1“The differences narrowed with increasing rates of water additions”
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