Abstract
Nitrogen is the most limiting nutrient for crop production on the northern Great Plains of North America. This study was initiated to determine if N yield and land use efficiency for N could be improved by manipulating crop diversity using three annual crops (wheat, Triticum aestivum L.; canola, Brassica napus L.; and field pea, Pisum arvense L.) commonly grown on the Canadian Prairies. The study included all combinations of the crops (sole crops and intercrops) and compared their effects on soil N depletion, plant N concentration, plant N yield, and land equivalent ratios for dry matter and grain N yield (NLER) at two field sites in Manitoba, Canada. The pea sole crop treatment tended to result in higher fall soil nitrate (NO 3 − )–N concentrations compared to other treatments, indicating greater potential for post‐season NO 3 − leaching after this treatment. There were often greater N concentrations in wheat, canola, and weeds when grown in association with field pea, suggesting that soil N could have been made available for nonlegume uptake through the NO 3 − –N sparing effect On average, most intercrop treatments resulted in more efficient land use for N compared to component sole crops, with overall mean intercrop NLER values ranging from 1.10 to 1.20. The wheat–canola–pea and canola–pea intercrop treatments tended to produce the highest and most consistent NLER values for crop dry matter and grain yield, respectively. The results of this study suggest that intercrops could be used for more efficient use of N on a per land area basis.
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Claims 8
Claim · model-written summary
Sole field pea tended to leave higher fall soil nitrate than other treatments.
- Taxon
- pea
Lathyrus oleraceuse0 - Treatment
- pea sole crop treatmente0
- Outcome
- fall soil nitrate (NO 3 − )–N concentrationse0
- Direction
- highere0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pea sole crop treatment tended to result in higher fall soil nitrate (NO 3 − )–N concentrations compared to other treatments”
Claim · model-written summary
Wheat nitrogen concentration was often greater when grown with field pea.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- grown in association with field peae0
- Outcome
- N concentrationse0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were often greater N concentrations in wheat, canola, and weeds when grown in association with field pea”
Claim · model-written summary
Canola nitrogen concentration was often greater when grown with field pea.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Treatment
- grown in association with field peae0
- Outcome
- N concentrationse0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“There were often greater N concentrations in wheat, canola, and weeds when grown in association with field pea”
Claim · model-written summary
Weed nitrogen concentration was often greater when grown with field pea.
- Taxon
- weedse0
- Treatment
- grown in association with field peae0
- Interactor
- field peae0other
- Outcome
- N concentrationse0
- Direction
- greatere0
Not reportedComparator
Verbatim
e0“There were often greater N concentrations in wheat, canola, and weeds when grown in association with field pea”
Claim · model-written summary
Most intercrops used land more efficiently for nitrogen than sole crops, with mean NLER from 1.10 to 1.20.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- intercrop treatmentse0
- Outcome
- land use for Ne0
- Direction
- more efficiente0
- Value
- 1.10 to 1.20e0
- Comparator
- component sole cropse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most intercrop treatments resulted in more efficient land use for N compared to component sole crops, with overall mean intercrop NLER values ranging from 1.10 to 1.20.”
t0“wheat, Triticum aestivum L.”
Claim · model-written summary
The wheat–canola–pea intercrop tended to have the highest and most consistent dry matter NLER.
- Taxon
- wheatTriticum aestivume0
- Treatment
- wheat–canola–peae0
- Outcome
- NLER values for crop dry mattere0
- Direction
- higheste0
- Qualifier
- tendede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The wheat–canola–pea and canola–pea intercrop treatments tended to produce the highest and most consistent NLER values for crop dry matter and grain yield, respectively.”
Claim · model-written summary
The canola–pea intercrop tended to have the highest and most consistent grain yield NLER.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- canola–pea intercrop treatmentse0
- Outcome
- grain yielde0
- Direction
- higheste0
- Qualifier
- tendede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The wheat–canola–pea and canola–pea intercrop treatments tended to produce the highest and most consistent NLER values for crop dry matter and grain yield, respectively.”
Claim · model-written summary
The authors suggest intercrops can use nitrogen more efficiently per land area.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- intercrops could be used for more efficient use of N on a per land area basise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intercrops could be used for more efficient use of N on a per land area basis.”
t0“wheat, Triticum aestivum L.”
The same questions in other papers
intercropping · nutrient: content · Lathyrus oleraceus (pea)Positive and negative results
6 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 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.