Abstract
Abstract A criterion for determining adequacy of inoculation of Glycine max by Rhizobium japonicum is needed for testing of commercial inoculants and for determining adequacy of nodulation. This study was undertaken to determine the inoculum level needed for maximum nitrogen fixation of Glycine max and to find a qualitative nodulation pattern that would be useful in recognizing good nodulation. To accomplish this end, soybeans were inoculated and grown in pots containing sand or soil in the greenhouse. Inoculation levels up to 2.4 ✕ 10 5 and 1.4 ✕ 10 7 Rhizobium japonicum cells per seed were used for soil‐ and sand‐grown plants respectively. Taproot nodulation was still increasing at the highest inoculum level in soil and sand, but lateral root nodulation had leveled off. Maximum total nitrogen fixed in plant tops was achieved at inoculation levels of 2 ✕ 10 3 and 1 ✕ 105 cells per seed for soil‐ and sand‐grown plants, respectively. At these inoculation levels at least four taproot nodules were formed. Results suggest that taproot nodulation of soybeans is a qualitative characteristic that may be useful in determining the adequacy of nodulation and may indicate abundance of rhizobia for a soybean variety.
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Claims 6
Claim · model-written summary
Taproot nodulation increased through the highest inoculum level.
- Taxon
- Glycine max
Glycine maxt0 - Treatment
- highest inoculum levele0
- Outcome
- Taproot nodulatione0
- Direction
- increasinge0
- Setting
- soil and sande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taproot nodulation was still increasing at the highest inoculum level in soil and sand, but lateral root nodulation had leveled off.”
t0“Glycine max”
Claim · model-written summary
Lateral root nodulation leveled off.
- Taxon
- Glycine maxGlycine maxt0
- Outcome
- lateral root nodulatione0
- Direction
- leveled offe0
- Setting
- soil and sande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Taproot nodulation was still increasing at the highest inoculum level in soil and sand, but lateral root nodulation had leveled off.”
t0“Glycine max”
Claim · model-written summary
Maximum nitrogen fixation in soil occurred at 2 ✕ 10 3 cells per seed.
- Taxon
- Glycine maxGlycine maxt0
- Outcome
- total nitrogen fixed in plant topse0
- Direction
- Maximume0
- Value
- 2 ✕ 10 3e0
- Setting
- soil‐e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum total nitrogen fixed in plant tops was achieved at inoculation levels of 2 ✕ 10 3 and 1 ✕ 105 cells per seed for soil‐ and sand‐grown plants, respectively.”
t0“Glycine max”
Claim · model-written summary
Maximum nitrogen fixation in sand occurred at 1 ✕ 105 cells per seed.
- Taxon
- Glycine maxGlycine maxt0
- Outcome
- total nitrogen fixed in plant topse0
- Direction
- Maximume0
- Value
- 1 ✕ 105 cells per seede0
- Setting
- sand‐grown plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum total nitrogen fixed in plant tops was achieved at inoculation levels of 2 ✕ 10 3 and 1 ✕ 105 cells per seed for soil‐ and sand‐grown plants, respectively.”
t0“Glycine max”
Claim · model-written summary
At those levels at least four taproot nodules formed.
- Taxon
- Glycine maxGlycine maxt0
- Outcome
- taproot nodulese0
- Value
- at least foure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At these inoculation levels at least four taproot nodules were formed.”
t0“Glycine max”
Claim · model-written summary
Taproot nodulation may indicate adequate nodulation and rhizobial abundance.
- Taxon
- soybeansGlycine maxe0
- Outcome
- taproot nodulatione0
- Qualifier
- may be useful in determining the adequacy of nodulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results suggest that taproot nodulation of soybeans is a qualitative characteristic that may be useful in determining the adequacy of nodulation and may indicate abundance of rhizobia for a soybean variety.”
The same questions in other papers
inoculation · symbiosis · Glycine max (soybean)Positive and negative results
264 papers in the same direction as this paper · 43 in the opposite direction · 2 reporting no difference from an alternative
- negative
- no effect
- negative
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.