Abstract
Most soils in the southern Coastal Plain need liming; however, long‐term data are needed on its value and changes in soil profile pH, Ca, or Mg. Field studies with lime rates have been maintained on a Tifton soil (Plinthic Kandiudult) for 31 yr and on Pelham soil (Arenic Paleaquult) for 24 yr to determine soil chemical changes, rates needed for high yields, and if yield of cotton ( Gossypium hirsutum L.) on low‐pH soils can be increased by Ca or Mg fertilization. Total amounts [calcium carbonate (CaCO 3 ) equivalent] of dolomitic lime were 0, 7.5, 15.0, and 30.0 Mg ha −1 for Tifton and 0, 11.7, and 34.0 Mg ha −1 for the Pelham. Liming increased pH, Ca, and Mg to a depth of 90 cm. Decreases in pH, Ca, and Mg were closely related to the amount of ammoniacal N (NH 4 –N) applied. Application of 15 Mg ha −1 dolomitic lime on the Tifton soil for 31 yr and 34 Mg ha −1 on the Pelham soil for 24 yr maintained surface soil (0–15 cm) pH near 6.0 and provided greatest crop yield. In no‐lime plots, in 2000, exchangeable Al (0–45 cm depth) was >0.3 cmol c kg −1 , and Al saturation was >15% of the effective cation exchange capacity on Tifton soil and >20% on Pelham soil. In those plots, low cotton yields were not increased by fertilization with Ca or Mg salts without liming. Providing 5.25 and 14 kg lime kg −1 N for the Tifton and Pelham soils, respectively, decreased soil Al saturation to <7%.
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Claims 7
Claim · model-written summary
Liming increased soil pH, calcium, and magnesium to 90 cm depth.
- Taxon
- cotton
Gossypium hirsutume7 - Treatment
- Liminge0
- Outcome
- pH, Ca, and Mge0
- Direction
- increasede0
- Qualifier
- to a depth of 90 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Liming increased pH, Ca, and Mg to a depth of 90 cm”
e7“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Soil pH, calcium, and magnesium decreases were associated with ammoniacal nitrogen applied.
- Taxon
- cottonGossypium hirsutume7
- Treatment
- ammoniacal N (NH 4 –N)e0
- Outcome
- pH, Ca, and Mge0
- Direction
- Decreasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreases in pH, Ca, and Mg were closely related to the amount of ammoniacal N (NH 4 –N) applied”
e7“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Fifteen Mg per hectare of lime on Tifton soil maintained near pH 6 and gave the highest crop yield.
- Taxon
- cottonGossypium hirsutume7
- Treatment
- 15 Mg ha −1 dolomitic limee0
- Outcome
- crop yielde0
- Direction
- greateste0
- Qualifier
- surface soil (0–15 cm) pH near 6.0e0
- Setting
- Tifton soile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 15 Mg ha −1 dolomitic lime on the Tifton soil for 31 yr and 34 Mg ha −1 on the Pelham soil for 24 yr maintained surface soil (0–15 cm) pH near 6.0 and provided greatest crop yield”
e7“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Thirty-four Mg per hectare of lime on Pelham soil maintained near pH 6 and gave the highest crop yield.
- Taxon
- cottonGossypium hirsutume7
- Treatment
- 34 Mg ha −1e0
- Outcome
- crop yielde0
- Direction
- greateste0
- Setting
- Pelham soile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“34 Mg ha −1 on the Pelham soil for 24 yr maintained surface soil (0–15 cm) pH near 6.0 and provided greatest crop yield”
e7“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Calcium or magnesium salts without liming did not raise low cotton yields.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- fertilization with Ca or Mg salts without liminge0
- Outcome
- cotton yieldse0
- Direction
- not increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low cotton yields were not increased by fertilization with Ca or Mg salts without liming”
Claim · model-written summary
Applying 5.25 kg lime per kg nitrogen lowered Tifton soil aluminum saturation below 7%.
- Taxon
- cottonGossypium hirsutume7
- Treatment
- 5.25e0
- Outcome
- soil Al saturatione0
- Direction
- decreasede0
- Value
- <7%e0
- Setting
- Tiftone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Providing 5.25 and 14 kg lime kg −1 N for the Tifton and Pelham soils, respectively, decreased soil Al saturation to <7%”
e7“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Applying 14 kg lime per kg nitrogen lowered Pelham soil aluminum saturation below 7%.
- Taxon
- cottonGossypium hirsutume7
- Treatment
- 14 kg lime kg −1 Ne0
- Outcome
- soil Al saturatione0
- Direction
- decreasede0
- Value
- <7%e0
- Setting
- Pelhame0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Providing 5.25 and 14 kg lime kg −1 N for the Tifton and Pelham soils, respectively, decreased soil Al saturation to <7%”
e7“cotton ( Gossypium hirsutum L.)”
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