Abstract
Johnson, E. N., Malhi, S. S., Hall, L. M. and Phelps, S. 2013. Effects of nitrogen fertilizer application on seed yield, N uptake, N use efficiency, and seed quality of Brassica carinata . Can. J. Plant Sci. 93: 1073–1081. Ethiopian mustard (Brassica carinata A. Braun) is a relatively new crop in western Canada and research information on its response to N fertilizer is lacking. Two field experiments (exp. 1 at 3 site-years and exp. 2 at 4 site-years) were conducted from 2008 to 2010 in Saskatchewan and Alberta, Canada, to determine effect of N fertilizer application on Brassica carinata plant density, seed and straw yield, N uptake in seed and straw, N use efficiency (NUE), N fertilizer use efficiency (NFUE) and seed quality. N rates applied were 0 to 160 kg N ha −1 and 0 to 200 kg N ha −1 in exps. 1 and 2, respectively. Plant density was not affected by increasing N rate at 5 site-years but declined with high rates of N application at 2 site-years. Seed yield responded to applied N in 6 of 7 site-years, with the non-responsive site having a high total N uptake at the 0 kg N ha −1 rate (high N t value). There were no sites where seed yields were maximized with the N rates applied. Response trends of straw yield and N uptake were similar to that of seed yield at the corresponding site-years. NUE and NFUE generally declined as N rate increased. Protein concentration in seed generally increased and oil concentration in seed decreased with increasing N rates. In conclusion, the responses of seed yield, total N uptake, NUE, and NFUE to applied N was similar to those reported in other Brassica species with the exception that a rate was not identified in which Brassica carinata yields were maximized.
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Claims 11
Claim · model-written summary
Plant density was unchanged with increasing nitrogen rate at five site-years.
- Taxon
- Brassica carinata
Brassica carinatat0 - Treatment
- increasing N ratee0
- Outcome
- Plant densitye0
- Direction
- not affectede0
- Qualifier
- 5 site-yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant density was not affected by increasing N rate at 5 site-years”
t0“Brassica carinata”
Claim · model-written summary
High nitrogen rates reduced plant density at two site-years.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- high rates of N applicatione0
- Outcome
- Plant densitye0
- Direction
- declinede0
- Qualifier
- 2 site-yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant density was not affected by increasing N rate at 5 site-years but declined with high rates of N application at 2 site-years.”
t0“Brassica carinata”
Claim · model-written summary
Seed yield responded to nitrogen at six of seven site-years.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- applied Ne0
- Outcome
- Seed yielde0
- Value
- 6 of 7 site-yearse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed yield responded to applied N in 6 of 7 site-years”
t0“Brassica carinata”
Claim · model-written summary
At the nonresponsive site, total nitrogen uptake was high without fertilizer.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- 0 kg N ha −1e0
- Outcome
- total N uptakee0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the non-responsive site having a high total N uptake at the 0 kg N ha −1 rate”
t0“Brassica carinata”
Claim · model-written summary
None of the tested nitrogen rates maximized seed yield.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- N rates appliede0
- Outcome
- seed yieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no sites where seed yields were maximized with the N rates applied.”
t0“Brassica carinata”
Claim · model-written summary
Straw yield followed seed yield response trends across site-years.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- Ne0
- Outcome
- straw yielde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Response trends of straw yield and N uptake were similar to that of seed yield at the corresponding site-years.”
t0“Brassica carinata”
Claim · model-written summary
Nitrogen uptake followed seed yield response trends across site-years.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- Ne0
- Outcome
- N uptakee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Response trends of straw yield and N uptake were similar to that of seed yield at the corresponding site-years.”
t0“Brassica carinata”
Claim · model-written summary
Nitrogen use efficiency generally declined as nitrogen rate rose.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- N ratee0
- Outcome
- NUEe0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NUE and NFUE generally declined as N rate increased.”
t0“Brassica carinata”
Claim · model-written summary
Nitrogen fertilizer use efficiency generally declined as nitrogen rate rose.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- N ratee0
- Outcome
- NFUEe0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NUE and NFUE generally declined as N rate increased.”
t0“Brassica carinata”
Claim · model-written summary
Seed protein concentration generally increased with nitrogen rate.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- increasing N ratese0
- Outcome
- Protein concentration in seede0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Protein concentration in seed generally increased and oil concentration in seed decreased with increasing N rates.”
t0“Brassica carinata”
Claim · model-written summary
Seed oil concentration generally decreased with nitrogen rate.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- increasing N ratese0
- Outcome
- oil concentration in seede0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Protein concentration in seed generally increased and oil concentration in seed decreased with increasing N rates.”
t0“Brassica carinata”
The same questions in other papers
nitrogen · yield · Brassica carinata (Ethiopian mustard)Results agree
10 papers in the same direction as this paper
- positive
- positive
- positive
7 papers more in this group
See all 11 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.