Abstract
Abstract Soil fertility requirements for sweet sorghum [ Sorghum bicolor (L.) Moench] as an alcohol fuel crop have not been well defined. The primary objective of this study was to determine the biomass and sugar (% Brix ✕ extracted juice) yield response of sweet sorghum to N‐P‐K and lime. The study was conducted for 2 years on a Wynnville silt loam (fine‐loamy, siliceous, thermic Glossic Fragiudult) soil in the Cumberland Plateau region of northern Alabama. Experimental design was a split‐plot with 0 or 8 Mg ha −1 dolomitic limestone and combinations of 0, 45, 90, or 180 kg ha −1 N, 30 or 90 kg ha −1 P, and 40 or 120 kg ha −1 K. Liming significantly increased yields of fresh and dry biomass, grain, and juice sugar extracted from stalks. The lime also greatly reduced exchangeable soil Mn and Al and increased Mg and decreased Mn concentrations of the biomass. Due to the dominant effect of lime and other interactions, biomass and juice sugar yields were not consistently related to applied N, P, or K. In nonlimed soil, biomass and sugar yields decreased with high N in the presence of low P‐K, but not with high P or K. This suggests an acidity ✕ P and/or K interaction related to toxicity of soil Mn and/or Al. In the limed soil the maximum dry biomass and sugar yields occurred with 180‐90‐120 (1981) or 90‐90‐120 (1982) kg ha −1 N‐P‐K, however yields from some treatments with lower levels of N, P, or K were often not significantly different at the 0.05 level. Inherent soil acidity and related Mg deficiency must be corrected to obtain maximum response of sweet sorghum to fertilization in Wynnville and associated soils of the Cumberland Plateau region.
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Claims 11
Claim · model-written summary
Liming significantly increased fresh and dry biomass, grain and juice sugar yield.
- Taxon
- sweet sorghume2
- Treatment
- Liminge0
- Outcome
- yields of fresh and dry biomass, graine0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Liming significantly increased yields of fresh and dry biomass, grain, and juice sugar extracted from stalks.”
e2“for sweet sorghum [”
Claim · model-written summary
Lime reduced exchangeable soil Mn and Al.
Not reportedComparator
Verbatim
e0“The lime also greatly reduced exchangeable soil Mn and Al”
e2“for sweet sorghum [”
Claim · model-written summary
Lime increased biomass Mg concentration.
Not reportedComparator
Verbatim
e0“increased Mg and decreased Mn concentrations of the biomass”
e2“for sweet sorghum [”
e1“The lime also greatly reduced”
Claim · model-written summary
Lime decreased biomass Mn concentration.
Not reportedComparator
Verbatim
e0“increased Mg and decreased Mn concentrations of the biomass”
e2“for sweet sorghum [”
e1“The lime also greatly reduced”
Claim · model-written summary
Biomass and juice sugar yield were not consistently related to N, P or K applications.
Not reportedDirection
Verbatim
e0“biomass and juice sugar yields were not consistently related to applied N, P, or K”
e2“for sweet sorghum [”
Claim · model-written summary
On nonlimed soil, high N with low P-K decreased biomass yield.
Verbatim
e0“In nonlimed soil, biomass and sugar yields decreased with high N in the presence of low P‐K, but not with high P or K.”
e2“for sweet sorghum [”
Claim · model-written summary
On nonlimed soil, high N with low P-K decreased sugar yields yield.
Verbatim
e0“In nonlimed soil, biomass and sugar yields decreased with high N in the presence of low P‐K, but not with high P or K.”
e2“for sweet sorghum [”
Claim · model-written summary
Maximum dry biomass yield on limed soil occurred at the stated N-P-K rates.
Verbatim
e0“In the limed soil the maximum dry biomass and sugar yields occurred with 180‐90‐120 (1981) or 90‐90‐120 (1982) kg ha −1 N‐P‐K”
e2“for sweet sorghum [”
Claim · model-written summary
Maximum sugar yield on limed soil occurred at the stated N-P-K rates.
Verbatim
e0“In the limed soil the maximum dry biomass and sugar yields occurred with 180‐90‐120 (1981) or 90‐90‐120 (1982) kg ha −1 N‐P‐K”
e2“for sweet sorghum [”
Claim · model-written summary
Some lower-fertilizer treatments did not yield significantly differently from maxima.
Verbatim
e0“yields from some treatments with lower levels of N, P, or K were often not significantly different at the 0.05 level”
e2“for sweet sorghum [”
Claim · model-written summary
The authors recommend correcting acidity and magnesium deficiency for maximal fertilizer response.
Verbatim
e0“Inherent soil acidity and related Mg deficiency must be corrected to obtain maximum response of sweet sorghum to fertilization in Wynnville and associated soils of the Cumberland Plateau region.”
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