Abstract
Abstract Exploratory laboratory, greenhouse, and field experiments in 1961 and 1962 were used to study the cobalt (Co) nutrition of soybeans in Indiana. The Co treatments were applied by either seed or foliar methods. Co treatments greater than 36.8 mg/kg of seed applied to the seed as the sulfate salt produced chlorosis of the leaves and stunted the young seedlings. Mild chlorosis could be completely corrected by adding Fe salts. A three‐state survey conducted in Illinois, Iowa, and Indiana (1961) reported similar results with CoSO 4 seed treatment at the rate of 92 mg/kg seed. Between 48 and 65% of the 396 fields studied reported the development of chlorotic seedlings. A controlled field experiment conducted in 1961 showed only decreased yields from Co applied at the rate of 184 mg/kg seed, but a similar experiment conducted in 1962 with Co applied at the rate of 18.4 mg/kg showed increased yields in three of the five locations. However, none of these differences in the latter two tests were significant at the 5% level. In a later study direct evidence for the translocation of foliar applied Co to the nodules was obtained using Co 60 .
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Claims 6
Claim · model-written summary
Cobalt treatments above 36.8 mg/kg of seed as sulfate salt produced chlorosis of leaves and stunted young seedlings.
- Taxon
- soybeans
Glycine maxe0 - Treatment
- Co treatments greater than 36.8 mg/kg of seede1
- Outcome
- chlorosis of the leavese1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cobalt (Co) nutrition of soybeans in Indiana”
e1“Co treatments greater than 36.8 mg/kg of seed applied to the seed as the sulfate salt produced chlorosis of the leaves and stunted the young seedlings”
Claim · model-written summary
Mild chlorosis caused by cobalt was completely corrected by adding iron salts.
- Taxon
- soybeansGlycine maxe0
- Treatment
- adding Fe saltse2
- Outcome
- Mild chlorosise2
- Direction
- completely correctede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cobalt (Co) nutrition of soybeans in Indiana”
e2“Mild chlorosis could be completely corrected by adding Fe salts”
Claim · model-written summary
Between 48 and 65% of 396 surveyed fields reported chlorotic seedlings after CoSO4 seed treatment at 92 mg/kg.
- Taxon
- soybeansGlycine maxe0
- Treatment
- CoSO 4 seed treatment at the rate of 92 mg/kg seede4
- Outcome
- chlorotic seedlingse3
- Value
- 48 and 65%e3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cobalt (Co) nutrition of soybeans in Indiana”
e3“Between 48 and 65% of the 396 fields studied reported the development of chlorotic seedlings”
e4“with CoSO 4 seed treatment at the rate of 92 mg/kg seed”
Claim · model-written summary
Cobalt applied at 184 mg/kg of seed in a 1961 controlled field experiment decreased soybean yields.
- Taxon
- soybeansGlycine maxe0
- Treatment
- Co applied at the rate of 184 mg/kg seede5
- Outcome
- yieldse5
- Direction
- decreasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cobalt (Co) nutrition of soybeans in Indiana”
e5“A controlled field experiment conducted in 1961 showed only decreased yields from Co applied at the rate of 184 mg/kg seed”
Claim · model-written summary
Cobalt applied at 18.4 mg/kg of seed in a 1962 field experiment increased soybean yields at three of five locations, not significantly.
- Taxon
- soybeansGlycine maxe0
- Treatment
- Co applied at the rate of 18.4 mg/kge6
- Outcome
- yieldse6
- Direction
- increasede6
- Value
- three of the five locationse6
- Qualifier
- none of these differences in the latter two tests were significant at the 5% levele7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cobalt (Co) nutrition of soybeans in Indiana”
e6“a similar experiment conducted in 1962 with Co applied at the rate of 18.4 mg/kg showed increased yields in three of the five locations”
e7“none of these differences in the latter two tests were significant at the 5% level”
Claim · model-written summary
Foliar-applied cobalt was translocated to soybean nodules.
- Taxon
- soybeansGlycine maxe0
- Treatment
- foliar applied Coe1
- Outcome
- translocation of foliar applied Co to the nodulese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cobalt (Co) nutrition of soybeans in Indiana”
e1“In a later study direct evidence for the translocation of foliar applied Co to the nodules was obtained using Co 60”
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See all 14 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.