Abstract
Abstract Recent development of soil‐applied inoculants, which have been advertised in midwestern states as increasing yields by an average of 10%, has stimulated a great deal of interest among soybean ( Glycine max (L.) Merr.) producers. Field studies with two soybean varieties were conducted over 2 years (three different cultivars were used), to evaluate crop response to application of commercial soil‐applied Rhizobium japonicum inoculants. Conventional seed‐applied inoculants were also studied for comparison of effectiveness. Plots were established on a highly productive silty clay loam soil which had not been cropped to soybeans for more than 15 years (the native population of rhizobia was assumed to be low). Grain yields, nodulation, and leaf and grain composition were measured. Inoculation of soil or seeds with commercial inocultants did not increase yield, nodule mass per plant, or leaf and grain N concentration. Small, but inconsistent, changes in total P concentration of grain were obtained from inoculation. Soil inoculants were not superior to seed‐applied inoculants for soybeans. These results combined with recent findings of other investigators (personal) communications from G. E. Ham and R. E. Smith) suggests that yield responses to soil or seed inoculants are unlikely in Cornbelt soils where soybeans are grown with some regularity because of a sufficient population of “native” rhizobia. There appears to be little justification for recommending in oculation of soybeans except where soybeans are to be planted in a field for the first time or where a previous crop was poorly nodulated.
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Claims 5
Claim · model-written summary
Inoculation of soil or seeds with commercial inoculants did not increase soybean yield, nodule mass per plant, or leaf and grain N concentration.
- Taxon
- soybean
Glycine maxe0 - Treatment
- Inoculation of soil or seeds with commercial inocultantse2
- Interactor
- Rhizobium japonicume0symbiont
- Outcome
- yield, nodule mass per plant, or leaf and grain N concentratione2
- Direction
- did not increasee2
- Setting
- Field studiese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field studies with two soybean varieties were conducted over 2 years (three different cultivars were used), to evaluate crop response to application of commercial soil‐applied Rhizobium japonicum inoculants”
e2“Inoculation of soil or seeds with commercial inocultants did not increase yield, nodule mass per plant, or leaf and grain N concentration”
Claim · model-written summary
Inoculation of soybean produced small but inconsistent changes in total P concentration of grain.
- Taxon
- soybeanGlycine maxe0
- Treatment
- inoculatione3
- Interactor
- Rhizobium japonicume0symbiont
- Outcome
- total P concentration of graine3
- Direction
- Small, but inconsistent, changese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field studies with two soybean varieties were conducted over 2 years (three different cultivars were used), to evaluate crop response to application of commercial soil‐applied Rhizobium japonicum inoculants”
e3“Small, but inconsistent, changes in total P concentration of grain were obtained from inoculation”
Claim · model-written summary
Soil-applied inoculants were not superior to seed-applied inoculants for soybeans.
- Taxon
- soybeansGlycine maxe4
- Treatment
- Soil inoculantse4
- Outcome
- superiore4
- Direction
- not superiore4
- Comparator
- seed‐applied inoculantse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Soil inoculants were not superior to seed‐applied inoculants for soybeans”
Claim · model-written summary
There is little justification for recommending inoculation of soybeans, except where soybeans are planted in a field for the first time or a previous crop was poorly nodulated.
- Taxon
- soybeansGlycine maxe5
- Outcome
- little justificatione5
- Qualifier
- except where soybeans are to be planted in a field for the first time or where a previous crop was poorly nodulatede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“There appears to be little justification for recommending in oculation of soybeans except where soybeans are to be planted in a field for the first time or where a previous crop was poorly nodulated”
Claim · model-written summary
Yield responses to soil or seed inoculants are unlikely in Cornbelt soils where soybeans are grown regularly, because of a sufficient population of native rhizobia.
- Taxon
- soybeansGlycine maxe6
- Outcome
- yield responsese6
- Qualifier
- sufficient populatione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“yield responses to soil or seed inoculants are unlikely in Cornbelt soils where soybeans are grown with some regularity because of a sufficient population”
The same questions in other papers
inoculation · symbiosis · Glycine max (soybean)Positive and negative results
44 papers in the same direction as this paper · 265 in the opposite direction
- negative
- positive
- positive
306 papers more in this group
See all 310 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.