Abstract
Abstract Barley ( Hordeum vulgare L.) is an important cereal crop in eastern Canada, where it is used mainly as a source of energy for monogastric animals. A 4‐yr field experiment was conducted to evaluate the effects of N application on the yield of spring barley. Three cultivars, Cadette, Leger (adapted feed types), and Argyle (unadapted malting type) were grown with 0, 50, 100, 150, or 200 kg N ha −1 applied as ammonium nitrate at seeding. Two other treatments consisted of 100 kg N ha −1 at seeding plus 50 kg N ha ‐1 as ammonium nitrate (broadcast) or urea (foliar spray) applied at Zadoks growth stage 50 (spike emergence). Grain yield generally did not respond to N treatments. Separate determination of main stem (MS) and tiller yield components revealed that the lack of response to progressively higher rates of N was due to the stable nature of MS yield components and to the relatively small contribution of tillers to grain yield. Very high levels of N occasionally reduced the grain set and yield of MS spikes. Mean weight per MS grain showed little variation among growing seasons and N treatments. High rates and split applications of N had few significant effects on tiller yield and yield components. Tiller spike densities were consistently low (81–147 spikes per square meter). Tiller spikes produced only 7 to 15 grains, with individual grains weighing 60 to 75% of the weight of MS grains. Previous cropping practices and environmental conditions seemed to affect spike development and grain‐set more than application of fertilizer N.
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Claims 10
Claim · model-written summary
Grain yield generally did not respond to nitrogen treatments.
- Taxon
- Barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- N treatmentse0
- Outcome
- Grain yielde0
- Direction
- did not responde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Grain yield generally did not respond to N treatments.”
t0“Spring Barley”
Claim · model-written summary
Main stem yield components were stable with increasing nitrogen.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- progressively higher rates of Ne1
- Outcome
- MS yield componentse0
- Direction
- stablee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stable nature of MS yield components”
e1“progressively higher rates of N”
t0“Spring Barley”
Claim · model-written summary
Tillers contributed relatively little to grain yield.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- contribution of tillers to grain yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relatively small contribution of tillers to grain yield”
t0“Spring Barley”
Claim · model-written summary
Very high nitrogen occasionally reduced main stem grain set and yield.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- Very high levels of Ne0
- Outcome
- grain set and yield of MS spikese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Very high levels of N occasionally reduced the grain set and yield of MS spikes.”
t0“Spring Barley”
Claim · model-written summary
Mean weight per main stem grain varied little by season or nitrogen.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- Mean weight per MS graine0
- Direction
- little variatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mean weight per MS grain showed little variation among growing seasons and N treatments.”
t0“Spring Barley”
Claim · model-written summary
High rates and split nitrogen had few significant effects on tiller yield components.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- High rates and split applications of Ne0
- Outcome
- tiller yield and yield componentse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High rates and split applications of N had few significant effects on tiller yield and yield components.”
t0“Spring Barley”
Claim · model-written summary
Tiller spike density was consistently low.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- Tiller spike densitiese0
- Direction
- lowe0
- Value
- 81–147 spikes per square metere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tiller spike densities were consistently low (81–147 spikes per square meter).”
t0“Spring Barley”
Claim · model-written summary
Tiller spikes produced 7 to 15 grains.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- grainse0
- Value
- 7 to 15 grainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tiller spikes produced only 7 to 15 grains”
t0“Spring Barley”
Claim · model-written summary
Tiller grains weighed 60 to 75% as much as main stem grains.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- individual grains weighinge0
- Value
- 60 to 75%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“individual grains weighing 60 to 75% of the weight of MS grains”
t0“Spring Barley”
Claim · model-written summary
Prior cropping and environment appeared more influential for spike development and grain set than nitrogen.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- application of fertilizer Ne0
- Outcome
- spike development and grain‐sete0
- Direction
- more thane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Previous cropping practices and environmental conditions seemed to affect spike development and grain‐set more than application of fertilizer N.”
t0“Spring Barley”
The same questions in other papers
nitrogen · yield · Hordeum vulgare (barley)Positive and negative results
46 papers in the same direction as this paper · 252 in the opposite direction
- positive
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See all 299 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.