Abstract
Lentil ( Lens culinaris ) production on the Canadian prairies has increased recently with possible benefits to cropping systems in this region. The yield benefit often observed in cereals grown after a pulse crop can be partially attributed to the supply of nitrogen (N) from decomposing pulse crop residues; however, the contribution of belowground residue (BGR) is poorly documented. The purpose of this greenhouse study was to quantify the N input from BGR (i.e., roots plus rhizodeposits) of lentil and wheat ( Triticum aestivum ) using shoot 15 N-labeling and to trace the 15 N from BGR into subsequently grown wheat plants. Belowground N (BGN) comprised 34 and 51 % of total plant N in lentil and wheat, respectively. Whereas wheat produced more root biomass than lentil, total amounts of BGN did not differ between species. However, biomass production and N uptake by wheat grown on lentil BGR were 49 and 14 % higher than wheat grown on wheat BGR. Moreover, a higher proportion of added 15 N from lentil BGR (14.4 vs. 8.5 %) was recovered in the succeeding wheat crop, indicating that lentil BGN was more readily mineralized than wheat BGN. The disproportionately high increase in yield vs. N uptake for wheat grown on lentil BGR, however, indicates that non-N factors also contributed to the increase in wheat yield. This study highlights the importance of including estimates of BGN when evaluating the positive effects of including pulse crops in rotation with cereals, although further research is required to identify non-N benefits of lentil.
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Claims 9
Claim · model-written summary
Belowground N comprised 34 percent of total plant N in lentil.
- Taxon
- lentil
Lens culinarise2 - Outcome
- Belowground N (BGN)e2
- Value
- 34e2
- Setting
- greenhouse studye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The purpose of this greenhouse study was to quantify the N input from BGR”
e2“Belowground N (BGN) comprised 34 and 51 % of total plant N in lentil and wheat, respectively”
Claim · model-written summary
Belowground N comprised 51 percent of total plant N in wheat.
- Taxon
- wheat
Triticum aestivume2 - Outcome
- Belowground N (BGN)e2
- Value
- 51 %e2
- Setting
- greenhouse studye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The purpose of this greenhouse study was to quantify the N input from BGR”
e2“Belowground N (BGN) comprised 34 and 51 % of total plant N in lentil and wheat, respectively”
Claim · model-written summary
Wheat produced more root biomass than lentil.
- Taxon
- wheatTriticum aestivume3
- Outcome
- root biomasse3
- Direction
- moree3
- Comparator
- lentile3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Whereas wheat produced more root biomass than lentil, total amounts of BGN did not differ between species”
Claim · model-written summary
Total belowground N did not differ between lentil and wheat.
- Taxon
- lentil and wheatLens culinarisTriticum aestivume1
- Outcome
- total amounts of BGNe3
- Direction
- did not differe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The purpose of this greenhouse study was to quantify the N input from BGR”
e1“to quantify the N input from BGR (i.e., roots plus rhizodeposits) of lentil and wheat ( Triticum aestivum ) using shoot 15 N-labeling”
e3“Whereas wheat produced more root biomass than lentil, total amounts of BGN did not differ between species”
Claim · model-written summary
Biomass production of wheat grown on lentil BGR was 49 percent higher than on wheat BGR.
- Taxon
- wheatTriticum aestivume4
- Treatment
- lentil BGRe4
- Outcome
- biomass productione4
- Direction
- highere4
- Value
- 49e4
- Comparator
- wheat BGRe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“biomass production and N uptake by wheat grown on lentil BGR were 49 and 14 % higher than wheat grown on wheat BGR”
Claim · model-written summary
N uptake by wheat grown on lentil BGR was 14 percent higher than on wheat BGR.
- Taxon
- wheatTriticum aestivume4
- Treatment
- lentil BGRe4
- Outcome
- N uptakee4
- Direction
- highere4
- Value
- 14 %e4
- Comparator
- wheat BGRe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“biomass production and N uptake by wheat grown on lentil BGR were 49 and 14 % higher than wheat grown on wheat BGR”
Claim · model-written summary
A higher proportion of added 15N from lentil BGR was recovered in the succeeding wheat crop than from wheat BGN.
- Taxon
- wheatTriticum aestivume5
- Treatment
- lentil BGRe5
- Outcome
- proportion of added 15 Ne5
- Direction
- highere5
- Value
- 14.4e5
- Qualifier
- vs. 8.5 %e5
- Comparator
- wheat BGNe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“a higher proportion of added 15 N from lentil BGR (14.4 vs. 8.5 %) was recovered in the succeeding wheat crop, indicating that lentil BGN was more readily mineralized than wheat BGN”
Claim · model-written summary
The disproportionate yield increase of wheat grown on lentil BGR indicates that non-N factors also contributed.
- Taxon
- wheatTriticum aestivume6
- Outcome
- yielde6
- Qualifier
- non-N factors also contributede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The disproportionately high increase in yield vs. N uptake for wheat grown on lentil BGR, however, indicates that non-N factors also contributed to the increase in wheat yield”
Claim · model-written summary
Estimates of belowground N should be included when evaluating pulse crops in rotation with cereals.
Verbatim
e7“This study highlights the importance of including estimates of BGN when evaluating the positive effects of including pulse crops in rotation with cereals”
The same questions in other papers
Lens culinaris · yield · Triticum aestivum (wheat)Positive and negative results
8 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- no effect
- no effect
9 papers more in this group
See all 13 papers →Lens culinaris · nutrient: content · Triticum aestivum (wheat)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.