Abstract
Abstract Although crop rotation may change soil mineral status, particularly N, there may also be a rotation effect beyond that which can be explained by soil mineral status alone. Research has shown that leaf mineral‐composition can vary between crop sequences at high fertilizer levels. We hypothesized that the rotation effect observed in longterm sequences of corn ( Zea mays L.) and soybean [ Glycine max (L.) Merr.] might be due to an increased nutrient concentration, not just an increased accumulation. A corn‐soybean rotation study in Minnesota managed at high nutrient fertility was used to test our hypothesis. The high management level was appraised by soil test levels. Corn and soybean sequences evaluated were monoculture, first year, second year, and annually‐alternated. These crop sequences were evaluated for their effects on plant nutrient concentration, accumulation, or both. The growth stage at which differences in plant nutrient concentration or accumulation might affect final yield was also evaluated. A positive effect of rotation on yield was observed in both crops. Shoot concentrations and total accumulations of N, P, and K were higher in first year corn compared to monoculture, suggesting that the increased corn yield associated with rotation may have been due to a general improvement in plant nutrition. Cropping sequence had less of an effect on soybean nutrient concentration than corn. Nutrient accumulation in soybean was not generally affected by crop sequence.
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Claims 6
Claim · model-written summary
Rotation increased corn yield.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- rotatione0
- Outcome
- yielde0
- Direction
- positive effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A positive effect of rotation on yield was observed in both crops.”
t0“Corn and Soybean”
Claim · model-written summary
Rotation increased soybean yield.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- rotatione0
- Outcome
- yielde0
- Direction
- positive effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A positive effect of rotation on yield was observed in both crops.”
t0“Corn and Soybean”
Claim · model-written summary
First-year corn had higher shoot N, P and K concentrations than monoculture corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- first year corne0
- Outcome
- Shoot concentrationse0
- Direction
- highere0
- Comparator
- monoculturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot concentrations and total accumulations of N, P, and K were higher in first year corn compared to monoculture”
Claim · model-written summary
First-year corn had higher total N, P and K accumulations than monoculture corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- first year corne0
- Outcome
- total accumulations of N, P, and Ke0
- Direction
- highere0
- Comparator
- monoculturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot concentrations and total accumulations of N, P, and K were higher in first year corn compared to monoculture”
Claim · model-written summary
Crop sequence affected soybean nutrient concentration less than corn nutrient concentration.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Cropping sequencee0
- Outcome
- nutrient concentratione0
- Direction
- less of an effecte0
- Comparator
- corne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cropping sequence had less of an effect on soybean nutrient concentration than corn.”
Claim · model-written summary
Soybean nutrient accumulation was generally unaffected by crop sequence.
- Taxon
- soybeanGlycine maxe0
- Treatment
- crop sequencee0
- Outcome
- Nutrient accumulatione0
- Direction
- not generally affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nutrient accumulation in soybean was not generally affected by crop sequence.”
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See all 322 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.