Abstract
Abstract Nodulation in field beans ( Phaseolus vulgaris L.) is poor in root‐rot infested soils of the Columbia Basin of central Washington. Studies were initiated to determine if nodulation and N 2 ‐fixation rate were improved after fumigation and reduction in root rot. The effect of fumigation on nodulation and bean yield was studied in the field where N and three strains of Rhizobium phaseoli were applied to field beans grown in a Warden fine sandy loam soil (Xeroilic Camborthids) infested with root rot ( Fusarium solani f. sp. phaseoli ). Early nodulation with one strain but not yield, increased significantly with inoculation. Fumigation with 400 kg/ha of chloropicrin significantly increased shoot weight, root weight, and total N uptake throughout the season and decreased the incidence of root rot. Fumigation increased seed yields by an average of 1,800 kg/ha in 1975 and 900 kg/ha in 1976. In general, N(C 2 H 2 )‐fixation rate was not significantly increased by either inoculation or fumigation. Only after adding a high rate of inoculum to the fumigated plots was the N 2 (C 2 H 2 )‐fixation rate increased at one of four sampling dates. It would appear that the major increase in plant growth and seed yield following fumigation was due to a reduction in root rot rather than from an increase in nodulation or N 2 (C 2 H 2 )‐fixation rate. Nitrogen application of 112 kg/ha of N in 1975 and 135 kg/ha of N in 1976 did not increase yields in either fumigated or non‐fumigated soils.
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Claims 11
Claim · model-written summary
One Rhizobium strain significantly increased early nodulation.
- Taxon
- field beanst0
- Treatment
- inoculatione0
- Interactor
- Rhizobium phaseoliRhizobium phaseolit1symbiont
- Outcome
- Early nodulatione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Early nodulation with one strain but not yield, increased significantly with inoculation.”
t0“field beans ( Phaseolus vulgaris L.)”
t1“Rhizobium phaseoli”
Claim · model-written summary
Inoculation did not significantly raise yield.
- Taxon
- field beanst0
- Treatment
- inoculatione0
- Interactor
- Rhizobium phaseoliRhizobium phaseolit1symbiont
- Outcome
- yielde0
Not reportedComparatorDirection
Verbatim
e0“Early nodulation with one strain but not yield, increased significantly with inoculation.”
t0“field beans ( Phaseolus vulgaris L.)”
t1“Rhizobium phaseoli”
Claim · model-written summary
Chloropicrin fumigation significantly increased shoot weight, root weight and nitrogen uptake.
- Taxon
- field beanst0
- Treatment
- Fumigation with 400 kg/ha of chloropicrine0
- Outcome
- shoot weight, root weight, and total N uptakee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Fumigation with 400 kg/ha of chloropicrin significantly increased shoot weight, root weight, and total N uptake throughout the season”
t0“field beans ( Phaseolus vulgaris L.)”
Claim · model-written summary
Chloropicrin fumigation decreased root rot incidence.
- Taxon
- field beanst0
- Treatment
- Fumigation with 400 kg/ha of chloropicrine0
- Interactor
- Fusarium solani f. sp. phaseoliFusarium phaseolit1pathogen
- Outcome
- incidence of root rote0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“Fumigation with 400 kg/ha of chloropicrin significantly increased shoot weight, root weight, and total N uptake throughout the season and decreased the incidence of root rot.”
t0“field beans ( Phaseolus vulgaris L.)”
t1“Fusarium solani f. sp. phaseoli”
Claim · model-written summary
Fumigation increased seed yield by 1,800 kg/ha in 1975.
- Taxon
- field beanst0
- Treatment
- Fumigatione0
- Outcome
- seed yieldse0
- Direction
- increasede0
- Value
- 1,800 kg/hae0
- Qualifier
- 1975e0
Not reportedComparator
Verbatim
e0“Fumigation increased seed yields by an average of 1,800 kg/ha in 1975 and 900 kg/ha in 1976.”
t0“field beans ( Phaseolus vulgaris L.)”
Claim · model-written summary
Fumigation increased seed yield by 900 kg/ha in 1976.
- Taxon
- field beanst0
- Treatment
- Fumigatione0
- Outcome
- seed yieldse0
- Direction
- increasede0
- Value
- 900 kg/hae0
- Qualifier
- 1976e0
Not reportedComparator
Verbatim
e0“Fumigation increased seed yields by an average of 1,800 kg/ha in 1975 and 900 kg/ha in 1976.”
t0“field beans ( Phaseolus vulgaris L.)”
Claim · model-written summary
Inoculation generally did not significantly increase nitrogen fixation rate.
- Taxon
- field beanst0
- Treatment
- inoculatione0
- Interactor
- Rhizobium phaseoliRhizobium phaseolit1symbiont
- Outcome
- N(C 2 H 2 )‐fixation ratee0
- Direction
- not significantly increasede0
Not reportedComparator
Verbatim
e0“In general, N(C 2 H 2 )‐fixation rate was not significantly increased by either inoculation or fumigation.”
t0“field beans ( Phaseolus vulgaris L.)”
t1“Rhizobium phaseoli”
Claim · model-written summary
Fumigation generally did not significantly increase nitrogen fixation rate.
- Taxon
- field beanst0
- Treatment
- fumigatione0
- Outcome
- N(C 2 H 2 )‐fixation ratee0
- Direction
- not significantly increasede0
Not reportedComparator
Verbatim
e0“In general, N(C 2 H 2 )‐fixation rate was not significantly increased by either inoculation or fumigation.”
t0“field beans ( Phaseolus vulgaris L.)”
Claim · model-written summary
High inoculum in fumigated plots increased fixation rate at one of four dates.
- Taxon
- field beanst0
- Treatment
- adding a high rate of inoculum to the fumigated plotse0
- Outcome
- N 2 (C 2 H 2 )‐fixation ratee0
- Direction
- increasede0
- Qualifier
- one of four sampling datese0
Not reportedComparator
Verbatim
e0“Only after adding a high rate of inoculum to the fumigated plots was the N 2 (C 2 H 2 )‐fixation rate increased at one of four sampling dates.”
t0“field beans ( Phaseolus vulgaris L.)”
Claim · model-written summary
Authors attribute fumigation related growth and yield gains mainly to reduced root rot.
Verbatim
e0“the major increase in plant growth and seed yield following fumigation was due to a reduction in root rot rather than from an increase in nodulation or N 2 (C 2 H 2 )‐fixation rate.”
t0“field beans ( Phaseolus vulgaris L.)”
Claim · model-written summary
Nitrogen application did not increase yield in fumigated or nonfumigated soil.
- Taxon
- field beanst0
- Treatment
- Nitrogen application of 112 kg/ha of N in 1975 and 135 kg/ha of N in 1976e0
- Outcome
- yieldse0
- Direction
- did not increasee0
Not reportedComparator
Verbatim
e0“Nitrogen application of 112 kg/ha of N in 1975 and 135 kg/ha of N in 1976 did not increase yields in either fumigated or non‐fumigated soils.”
t0“field beans ( Phaseolus vulgaris L.)”
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See all 156 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.