Abstract
Abstract The causative factors for corn ( Zea mays L.) response to methyl bromide (CH 3 Br) fumigation, in the absence of known specific pathogens, are unknown. This study was conducted to determine if deleterious nonspecific rhizosphere microorganisms are the causative agents. Soil fumigation was postulated to increase yield of continuous corn but to have less effect on the yield of corn grown in rotation, because more deleterious rhizosphere microorganisms were suspected in monoculture than in rotation. The effects of fumigation and crop rotation on corn grain yield, plant height and P content, available soil N and P, mycorrhizal infection, and soil microbial biomass were investigated at two sites near Mead, NE, on a Sharpsburg silty clay loam soil (fine, montmorillonitic, mesic Typic Argiudoll). Methyl bromide treatments were applied prior to planting for 4 yr at one site and 2 yr at the other site. The sites differed in fertilization, pest management, and crop sequences, but both contained continuous corn. Fumigation resulted in an increase in grain yield under monoculture only once in six site years. Unexpectedly, however, fumigation resulted in a decrease in grain yield under rotation in 7 of 12 observations. Plants in fumigated soil were P‐deficient early in the growing season despite similar soil test P concentrations in control and fumigated plots. Fumigation reduced mycorrhizal infection and soil microbial biomass. Mycorrhizal infection of corn shortly after germination appears to be important to initial corn growth in this soil. Fumigating soil revealed a considerable biological influence on corn growth and yield by reducing both deleterious and beneficial microorganisms.
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Claims 9
Claim · model-written summary
Methyl bromide fumigation increased corn grain yield under monoculture only once in six site years.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Fumigatione3
- Outcome
- grain yielde3
- Direction
- increasee3
- Qualifier
- under monoculture only once in six site yearse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The causative factors for corn ( Zea mays L.) response to methyl bromide (CH 3 Br) fumigation”
e3“Fumigation resulted in an increase in grain yield under monoculture only once in six site years”
Claim · model-written summary
Methyl bromide fumigation decreased corn grain yield under rotation in 7 of 12 observations.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- fumigatione4
- Outcome
- grain yielde4
- Direction
- decreasee4
- Qualifier
- under rotation in 7 of 12 observationse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The causative factors for corn ( Zea mays L.) response to methyl bromide (CH 3 Br) fumigation”
e4“fumigation resulted in a decrease in grain yield under rotation in 7 of 12 observations”
Claim · model-written summary
Plants in fumigated soil were P-deficient early in the growing season.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- fumigated soile5
- Outcome
- P‐deficiente5
- Comparator
- controle5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The causative factors for corn ( Zea mays L.) response to methyl bromide (CH 3 Br) fumigation”
e5“Plants in fumigated soil were P‐deficient early in the growing season despite similar soil test P concentrations in control and fumigated plots”
Claim · model-written summary
Fumigation did not change soil test P concentrations relative to control plots.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- fumigated plotse5
- Outcome
- soil test P concentrationse5
- Direction
- no_changeinferrede5
- Comparator
- controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The causative factors for corn ( Zea mays L.) response to methyl bromide (CH 3 Br) fumigation”
e5“Plants in fumigated soil were P‐deficient early in the growing season despite similar soil test P concentrations in control and fumigated plots”
Claim · model-written summary
Fumigation reduced mycorrhizal infection of corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Fumigatione6
- Interactor
- Mycorrhizaet0symbiont
- Outcome
- mycorrhizal infectione6
- Direction
- reducede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The causative factors for corn ( Zea mays L.) response to methyl bromide (CH 3 Br) fumigation”
e6“Fumigation reduced mycorrhizal infection and soil microbial biomass”
t0“Response of Corn and Mycorrhizae”
Claim · model-written summary
Fumigation reduced soil microbial biomass.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Fumigatione6
- Outcome
- soil microbial biomasse6
- Direction
- reducede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The causative factors for corn ( Zea mays L.) response to methyl bromide (CH 3 Br) fumigation”
e6“Fumigation reduced mycorrhizal infection and soil microbial biomass”
Claim · model-written summary
Mycorrhizal infection of corn shortly after germination appears to be important to initial corn growth in this soil.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Mycorrhizal infectione7
- Outcome
- initial corn growthe7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The causative factors for corn ( Zea mays L.) response to methyl bromide (CH 3 Br) fumigation”
e7“Mycorrhizal infection of corn shortly after germination appears to be important to initial corn growth in this soil”
Claim · model-written summary
Fumigating soil reduced both deleterious and beneficial microorganisms.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Fumigating soile1
- Outcome
- deleterious and beneficial microorganismse1
- Direction
- reducinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The causative factors for corn ( Zea mays L.) response to methyl bromide (CH 3 Br) fumigation”
e1“Fumigating soil revealed a considerable biological influence on corn growth and yield by reducing both deleterious and beneficial microorganisms”
Claim · model-written summary
Fumigating soil revealed a considerable biological influence on corn growth and yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Fumigating soile1
- Outcome
- corn growth and yielde1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The causative factors for corn ( Zea mays L.) response to methyl bromide (CH 3 Br) fumigation”
e1“Fumigating soil revealed a considerable biological influence on corn growth and yield by reducing both deleterious and beneficial microorganisms”
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See all 11 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.