Abstract
Winter camelina [WC, Camelina sativa (L.) Crantz] and field pennycress (FP, Thlaspi arvense L.) are emerging oilseed crops in corn–soybean rotations, but little is known about their cover crop potential. A 2-year study was conducted in Minnesota, USA to evaluate the effect of winter oilseed crops on nitrogen (N) use, growth and yield of corn and soybean. Treatments included WC, FP, winter rye (WR, Secale cereale L.), and a no cover crop (NC) control. Oilseed crops produced 40–50% less spring biomass and accumulated less N compared to WR. The tissue-N of WC and FP was 39.0% and 6.6% higher than WR, respectively. The C:N ratio of cover crops was lower than 20:1, suggesting rapid decomposition. Compared with NC, cover crops lowered soil nitrate before major crops planting, but the post-harvest N profile following corn and soybean was not affected. Compared with NC, cover crops significantly decreased corn yield, with 8.7%, 9.5% and 9.8% reduction following WC, FP and WR, respectively. Cover crops did not affect growth, yield and N uptake of soybean. Oilseed crops showed potential to improve N cycling in the rotation, but more research of their impact on major crops is needed.
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Claims 11
Claim · model-written summary
Winter oilseeds produced 40–50% less spring biomass than winter rye.
- Taxon
- Camelina sativa (L.) Crantz
.jpg?width=60)
Camelina sativae1 - Outcome
- spring biomasse0
- Direction
- lesse0
- Value
- 40–50%e0
- Comparator
- WRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Oilseed crops produced 40–50% less spring biomass and accumulated less N compared to WR”
e1“Winter camelina [WC, Camelina sativa (L.) Crantz] and field pennycress (FP, Thlaspi arvense L.)”
Claim · model-written summary
Winter oilseeds accumulated less nitrogen than winter rye.
- Taxon
- Thlaspi arvense L.
_-_Guelph%2C_Ontario_2020-04-12.jpg?width=60)
Thlaspi arvensee1 - Outcome
- accumulated less Ne0
- Direction
- lesse0
- Comparator
- WRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_Guelph%2C_Ontario_2020-04-12.jpg?width=500)
Verbatim
e0“Oilseed crops produced 40–50% less spring biomass and accumulated less N compared to WR”
e1“field pennycress (FP, Thlaspi arvense L.)”
Claim · model-written summary
Camelina tissue nitrogen was 39.0% higher than winter rye.
- Taxon
- Camelina sativa (L.) CrantzCamelina sativae1
- Outcome
- tissue-Ne0
- Direction
- highere0
- Value
- 39.0%e0
- Comparator
- WRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tissue-N of WC and FP was 39.0% and 6.6% higher than WR, respectively”
e1“Winter camelina [WC, Camelina sativa (L.) Crantz]”
Claim · model-written summary
Pennycress tissue nitrogen was 6.6% higher than winter rye.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tissue-N of WC and FP was 39.0% and 6.6% higher than WR, respectively”
e1“field pennycress (FP, Thlaspi arvense L.)”
Claim · model-written summary
Cover crop carbon to nitrogen ratios were below 20:1.
- Taxon
- Camelina sativa (L.) CrantzCamelina sativae1
- Outcome
- C:N ratioe0
- Direction
- lowere0
- Value
- 20:1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The C:N ratio of cover crops was lower than 20:1”
e1“Winter camelina [WC, Camelina sativa (L.) Crantz]”
Claim · model-written summary
Cover crops lowered soil nitrate before corn and soybean planting.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- cover cropse0
- Outcome
- soil nitratee0
- Direction
- lowerede0
- Comparator
- NCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with NC, cover crops lowered soil nitrate before major crops planting”
e1“growth and yield of corn and soybean”
Claim · model-written summary
Cover crops did not affect post harvest nitrogen profile after corn and soybean.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- cover cropse1
- Outcome
- post-harvest N profilee0
- Direction
- not affectede0
- Comparator
- NCe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the post-harvest N profile following corn and soybean was not affected”
e1“Compared with NC, cover crops lowered soil nitrate”
Claim · model-written summary
Winter camelina reduced corn yield by 8.7% relative to no cover crop.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- WCe0
- Outcome
- corn yielde0
- Direction
- decreasede0
- Value
- 8.7%e0
- Comparator
- NCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with NC, cover crops significantly decreased corn yield, with 8.7%, 9.5% and 9.8% reduction following WC, FP and WR, respectively”
e1“Winter camelina [WC, Camelina sativa (L.) Crantz]”
Claim · model-written summary
Field pennycress reduced corn yield by 9.5% relative to no cover crop.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- FPe0
- Outcome
- corn yielde0
- Direction
- decreasede0
- Value
- 9.5%e0
- Comparator
- NCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with NC, cover crops significantly decreased corn yield, with 8.7%, 9.5% and 9.8% reduction following WC, FP and WR, respectively”
Claim · model-written summary
Winter rye reduced corn yield by 9.8% relative to no cover crop.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- WRe0
- Outcome
- corn yielde0
- Direction
- decreasede0
- Value
- 9.8%e0
- Comparator
- NCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with NC, cover crops significantly decreased corn yield, with 8.7%, 9.5% and 9.8% reduction following WC, FP and WR, respectively”
Claim · model-written summary
Cover crops did not affect soybean growth, yield or nitrogen uptake.
- Taxon
- soybean
Glycine maxe0 - Treatment
- Cover cropse0
- Outcome
- growth, yield and N uptakee0
- Direction
- did not affecte0
- Comparator
- NCe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cover crops did not affect growth, yield and N uptake of soybean”
e1“no cover crop (NC) control”
The same questions in other papers
cover crop · nutrient: content · Zea mays (maize)Positive and negative results
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- no effect
- negative
- no effect
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See all 36 papers →cover crop · yield · Glycine max (soybean)Positive and negative results
67 papers in the same direction as this paper · 33 reporting no difference from an alternative
- no effect
- no effect
- positive
97 papers more in this group
See all 101 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.