Abstract
Abstract A field study was established in 1986 on a Viborg silty clay loam (fine‐silty, mixed, mesic Pachic Haplustoll) soil in eastern South Dakota. The objectives were to quantify the influence of crop rotation, tillage, and residual P (254 kg P ha −1 applied in fall 1985) on the incidence of vesicular‐arbuscular mycorrhizae (VAM) of corn ( Zea mays L.) and to define the relationship between VAM colonization, early growth response to P, and early P uptake of corn. Plant and root samples were collected periodically from plots that varied in tillage and previous crop. Crop rotation and tillage influenced the early growth and P uptake of corn. Large differences in early growth response to P were observed among cropping systems. Average relative growth response as compared with the check during both years ranged from 360% for the moldboard (MP) corn‐fallow rotation to 7% for the ridge‐plant (RP) corn‐soybean ( Glycine max [L.] Merr.) rotation. Early dry‐matter production and P uptake in the check plots were highest in the RP corn‐soybean system and lowest in the MP corn‐fallow system. Generally, VAM colonization rates were significantly higher ( P ≤ 0.10) in the RP systems than in the MP systems. Considerable reduction in VAM colonization rates were found with P fertilization ( P ≤ 0.01) in all cropping systems. An inverse relationship was measured between VAM colonization and relative early growth response to P ( Y = 647.0 − 49.4 X + 0.97 X 2 ; R 2 = 0.92; Y = growth response in percent, X = percent root length colonized). Considering early dry‐matter production, P uptake, and mycorrhizal association the RP corn‐soybean system appears to provide a good environment for P nutrition of corn during early vegetative growth.
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Claims 10
Claim · model-written summary
Crop rotation and tillage influenced early corn growth and phosphorus uptake.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Crop rotation and tillagee0
- Outcome
- early growth and P uptakee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop rotation and tillage influenced the early growth and P uptake of corn.”
Claim · model-written summary
Early growth response to phosphorus varied substantially among cropping systems.
Not reportedTaxonDirection
Verbatim
e0“Large differences in early growth response to P were observed among cropping systems.”
Claim · model-written summary
Relative growth response to phosphorus was 360% in moldboard corn-fallow rotation.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- moldboard (MP) corn‐fallow rotatione0
- Outcome
- relative growth responsee0
- Value
- 360%e0
- Comparator
- checke0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average relative growth response as compared with the check during both years ranged from 360% for the moldboard (MP) corn‐fallow rotation to 7% for the ridge‐plant (RP) corn‐soybean ( Glycine max [L.] Merr.) rotation.”
Claim · model-written summary
Relative growth response to phosphorus was 7% in ridge-plant corn-soybean rotation.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- ridge‐plant (RP) corn‐soybeane0
- Outcome
- relative growth responsee0
- Value
- 7%e0
- Comparator
- checke0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average relative growth response as compared with the check during both years ranged from 360% for the moldboard (MP) corn‐fallow rotation to 7% for the ridge‐plant (RP) corn‐soybean ( Glycine max [L.] Merr.) rotation.”
Claim · model-written summary
Check-plot early dry matter and phosphorus uptake were highest in ridge-plant corn-soybean system.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- Early dry‐matter production and P uptakee0
- Direction
- higheste0
- Setting
- RP corn‐soybean systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early dry‐matter production and P uptake in the check plots were highest in the RP corn‐soybean system”
Claim · model-written summary
Check-plot early dry matter and phosphorus uptake were lowest in moldboard corn-fallow system.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- Early dry‐matter production and P uptakee0
- Direction
- loweste0
- Setting
- MP corn‐fallow systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early dry‐matter production and P uptake in the check plots were highest in the RP corn‐soybean system and lowest in the MP corn‐fallow system.”
Claim · model-written summary
VAM colonization was significantly higher in ridge-plant than moldboard systems.
Not reportedTaxon
Verbatim
e0“VAM colonization rates were significantly higher ( P ≤ 0.10) in the RP systems than in the MP systems.”
Claim · model-written summary
Phosphorus fertilization significantly reduced VAM colonization in every cropping system.
Not reportedTaxonComparator
Verbatim
e0“Considerable reduction in VAM colonization rates were found with P fertilization ( P ≤ 0.01) in all cropping systems.”
Claim · model-written summary
VAM colonization was inversely related to relative early growth response to phosphorus (R2 = 0.92).
- Interactor
- VAMe0symbiont
- Outcome
- relative early growth response to Pe0
- Direction
- inversee0
- Value
- R 2 = 0.92e0
Not reportedTaxon
Verbatim
e0“An inverse relationship was measured between VAM colonization and relative early growth response to P ( Y = 647.0 − 49.4 X + 0.97 X 2 ; R 2 = 0.92; Y = growth response in percent, X = percent root length colonized).”
Claim · model-written summary
The ridge-plant corn-soybean system appears to favor early corn phosphorus nutrition.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- RP corn‐soybean system appears to provide a good environment for P nutritione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the RP corn‐soybean system appears to provide a good environment for P nutrition of corn during early vegetative growth.”
The same questions in other papers
fertilization · disease · Zea mays (maize)Results differ
27 papers in the same direction as this paper · 56 in the opposite direction
- positive
- positive
- positive
80 papers more in this group
See all 84 papers →rotation · growth · Zea mays (maize)Positive and negative results
34 papers in the same direction as this paper · 12 in the opposite direction
- negative
- negative
- no effect
43 papers more in this group
See all 47 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.