Abstract
The introduction of new semileafless cultivars has contributed to the rapid expansion of pea (Pisum sativum) on the Canadian prairies. To determine the response of four new semi-leafless cultivars to rhizobia inoculation and starter fertilizer N, 58 field trials were conducted from 1995 to 1998 over a wide geographic region of Alberta. However, due to possible cross-contamination in 1995 and 1996 between inoculated and uninoculated treatments, average inoculation responses were only determined for the 22 trials conducted in 1997 and 1998. Rhizobia inoculation increased seed yield in 9 of the 22 trials by an average of 14%. The frequency of an inoculation benefit was only slightly higher (45% vs. 38%) on land with no history of legumes (n = 11) than on land that had grown a legume crop (n = 8), but the magnitude of the inoculation benefit was appreciably greater (19 vs. 5%) on land with no history of legumes. A significant interaction of inoculation with pea cultivar was observedin 6 of 22 trials: Majoret pea was the most responsive cultivar to inoculation while Baroness pea was the least responsive. Application of N fertilizer (20, 40 or 60 kg N ha –1 ) increased pea yield in 24% of the 58 trials conducted by an average of 9%. When spring soil NO 3 -N to 30cm was less than 20 kg N ha –1 , application of N fertilizer increased pea yield in 33% of the trials by an average of 11% (n = 12). The modest benefits of rhizobia inoculation or starter N fertilizer in most trials, despite appreciable deficits between spring soil NO 3 -N and accumulation of N by pea, was likely due to adequate nodulation of pea by indigenous rhizobia. Key words: Pisum sativum, nitrogen fertilizer, Rhizobium leguminosarum biovar viceae, rhizobia inoculation, seed protein
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Claims 9
Claim · model-written summary
Rhizobia inoculation raised pea seed yield in 9 of 22 trials by 14% on average.
- Taxon
- pea
Lathyrus oleraceust0 - Treatment
- Rhizobia inoculatione0
- Interactor
- Rhizobiae0symbiont
- Outcome
- seed yielde0
- Direction
- increasede0
- Value
- 14%e0
Not reportedComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobia inoculation increased seed yield in 9 of the 22 trials by an average of 14%”
t0“pea”
Claim · model-written summary
Inoculation benefit occurred slightly more often without a legume history than with one, 45% versus 38%.
- Taxon
- peaLathyrus oleraceust0
- Interactor
- inoculatione0symbiont
- Outcome
- frequency of an inoculation benefite0
- Direction
- slightly highere0
- Value
- 45% vs. 38%e0
- Comparator
- land that had grown a legume crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The frequency of an inoculation benefit was only slightly higher (45% vs. 38%) on land with no history of legumes (n = 11) than on land that had grown a legume crop (n = 8)”
t0“pea”
Claim · model-written summary
The inoculation benefit was greater on land without a legume history, 19 versus 5%.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- magnitude of the inoculation benefite0
- Direction
- appreciably greatere0
- Value
- 19 vs. 5%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the magnitude of the inoculation benefit was appreciably greater (19 vs. 5%) on land with no history of legumes”
t0“pea”
Claim · model-written summary
Inoculation interacted significantly with pea cultivar in 6 of 22 trials.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- inoculatione0
- Outcome
- interaction of inoculation with pea cultivare0
- Value
- 6 of 22 trialse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant interaction of inoculation with pea cultivar was observedin 6 of 22 trials”
t0“pea”
Claim · model-written summary
Majoret pea was most responsive to inoculation.
- Taxon
- peaLathyrus oleraceuse0
- Material
- Majorete0
- Outcome
- most responsive cultivar to inoculatione0
- Direction
- most responsivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Majoret pea was the most responsive cultivar to inoculation”
Claim · model-written summary
Baroness pea was least responsive to inoculation.
- Taxon
- peaLathyrus oleraceuse0
- Material
- Baronesse0
- Outcome
- least responsivee0
- Direction
- least responsivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Baroness pea was the least responsive”
Claim · model-written summary
Nitrogen fertilizer increased pea yield in 24% of 58 trials by 9% on average.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- N fertilizer (20, 40 or 60 kg N ha –1 )e0
- Outcome
- pea yielde0
- Direction
- increasede0
- Value
- 9%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of N fertilizer (20, 40 or 60 kg N ha –1 ) increased pea yield in 24% of the 58 trials conducted by an average of 9%”
Claim · model-written summary
When spring soil nitrate was below 20 kg N ha –1, nitrogen fertilizer increased pea yield in 33% of trials by 11% on average.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- N fertilizere0
- Outcome
- pea yielde0
- Direction
- increasede0
- Value
- 11%e0
- Qualifier
- spring soil NO 3 -N to 30cm was less than 20 kg N ha –1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When spring soil NO 3 -N to 30cm was less than 20 kg N ha –1 , application of N fertilizer increased pea yield in 33% of the trials by an average of 11%”
Claim · model-written summary
Authors attributed modest inoculation and starter nitrogen benefits to adequate nodulation by indigenous rhizobia.
- Taxon
- peaLathyrus oleraceuse0
- Interactor
- indigenous rhizobiae0symbiont
- Outcome
- modest benefits of rhizobia inoculation or starter N fertilizere0
- Qualifier
- likely due to adequate nodulation of pea by indigenous rhizobiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The modest benefits of rhizobia inoculation or starter N fertilizer in most trials, despite appreciable deficits between spring soil NO 3 -N and accumulation of N by pea, was likely due to adequate nodulation of pea by indigenous rhizobia”
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See all 240 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.