Abstract
Abstract Soil acidity severely limits the growth of soybeans [Glycine max. (L.) Merr.] on Histosols in North Carolina. Laboratory and greenhouse studies were conducted to determine the critical soil pH levels for soybean growth and the chemical factors influencing growth. Soybeans were grown on eight organic soils which had been limed with dolomitic limestone to give a pH range from 4 to 5. Lime rates were based on the CaCl 2 exchangeable acidity of each soil. Measurements were made of exchangeable soil acidity, exchangeable AI and Ca, and water soluble AI and Ca. Plant variables measured were shoot, root and nodule dry weight, nodule number and concentration of N, P, K, Ca, Mg, and AI in shoots and roots. These measurements were made at 28 and 40 days after planting in order to calculate growth rates and nutrient uptake rates. Growth responses to liming were obtained on all soils. Shoot growth was significantly related to soil pH and water soluble AI and Ca. Nodule number and weight increased significantly as soil pH increased. Both N con. centration and uptake increased markedly as soil pH increased. Critical soil pH for shoot, root, and nodule growth was in the range of 4.6 to 4.8 for most of the soils. The growth responses to liming are attributed to decreasing the exchangeable and water soluble AI, increasing the water soluble Ca and providing a favorable soil pH for rhizobium activity.
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Claims 7
Claim · model-written summary
Liming improved soybean growth on all soils.
- Taxon
- soybeans
Glycine maxe1 - Treatment
- liminge0
- Outcome
- Growth responsese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth responses to liming were obtained on all soils.”
e1“growth of soybeans [Glycine max. (L.) Merr.]”
Claim · model-written summary
Soybean shoot growth was significantly related to soil pH and water soluble aluminum and calcium.
- Taxon
- soybeansGlycine maxe1
- Outcome
- Shoot growthe0
- Setting
- soil pHe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot growth was significantly related to soil pH and water soluble AI and Ca.”
e1“growth of soybeans [Glycine max. (L.) Merr.]”
Claim · model-written summary
Soybean nodule number and weight increased significantly as soil pH increased.
- Taxon
- soybeansGlycine maxe1
- Outcome
- Nodule number and weighte0
- Direction
- increasede0
- Setting
- soil pHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodule number and weight increased significantly as soil pH increased.”
e1“growth of soybeans [Glycine max. (L.) Merr.]”
Claim · model-written summary
Soybean nitrogen concentration increased markedly as soil pH increased.
- Taxon
- soybeansGlycine maxe1
- Outcome
- N con. centratione0
- Direction
- increasede0
- Setting
- soil pHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both N con. centration and uptake increased markedly as soil pH increased.”
e1“growth of soybeans [Glycine max. (L.) Merr.]”
Claim · model-written summary
Soybean nitrogen uptake increased markedly as soil pH increased.
- Taxon
- soybeansGlycine maxe1
- Outcome
- uptakee0
- Direction
- increasede0
- Setting
- soil pHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both N con. centration and uptake increased markedly as soil pH increased.”
e1“growth of soybeans [Glycine max. (L.) Merr.]”
Claim · model-written summary
Critical soil pH for soybean shoot, root and nodule growth was 4.6 to 4.8 on most soils.
- Taxon
- soybeansGlycine maxe1
- Outcome
- Critical soil pH for shoot, root, and nodule growthe0
- Value
- 4.6 to 4.8e0
- Qualifier
- for most of the soilse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Critical soil pH for shoot, root, and nodule growth was in the range of 4.6 to 4.8 for most of the soils.”
e1“growth of soybeans [Glycine max. (L.) Merr.]”
Claim · model-written summary
Authors attributed liming responses to lower soil aluminum, higher soluble calcium and favorable pH for rhizobium activity.
- Taxon
- soybeansGlycine maxe1
- Treatment
- liminge0
- Outcome
- growth responsese0
- Qualifier
- decreasing the exchangeable and water soluble AI, increasing the water soluble Ca and providing a favorable soil pH for rhizobium activitye0
RhizobiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth responses to liming are attributed to decreasing the exchangeable and water soluble AI, increasing the water soluble Ca and providing a favorable soil pH for rhizobium activity.”
e1“growth of soybeans [Glycine max. (L.) Merr.]”
The same questions in other papers
lime · growth · Glycine max (soybean)Results differ
28 papers in the same direction as this paper · 5 in the opposite direction
- negative
- no effect
- no effect
30 papers more in this group
See all 34 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.