Abstract
The effects of soil chemical changes on soybean root growth, mineral nutrition and grain yield, as a result of surface application of lime under no-till (NT), are still under discussion. A field trial was carried out on a loamy dystrophic Typic Hapludox at Ponta Grossa, Paraná State, Brazil, using a completely randomized block design with three replicates, in a split-plot experiment. The main plots received four dolomitic lime rates applied on the surface (0, 2, 4, and 6 Mg ha-1) in July 1993. In the subplots, two dolomitic lime rates were reapplied on the surface (0 and 3 Mg ha-1) in June 2000. After nine years, liming increased pH, exchangeable Ca2+ and reduced exchangeable Al3+ as well as soil Al3+ saturation down to a 60 cm depth. Re-liming, after two years, also provided soil acidity amelioration to a 60 cm depth. Soybean total root length per soil surface area (0-60 cm) decreased with the surface lime application under NT. The reduction in soil exchangeable Al3+ with liming did not change Al concentrations in the soybean roots and leaves. Surface-applied dolomitic lime under NT brought an increase in Ca and Mg concentrations and a decrease in the Mn level in both soybean roots and leaves. Soybean grain yield was not influenced by surface liming because of the decreased Al toxicity and because root growth was stimulated by soil acidity stress under NT.
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Claims 8
Claim · model-written summary
Surface liming increased soil pH and exchangeable Ca2+ down to 60 cm.
- Taxon
- soybean
Glycine maxe1 - Treatment
- liminge0
- Outcome
- pH, exchangeable Ca2+e0
- Direction
- increasede0
- Qualifier
- down to a 60 cm depthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After nine years, liming increased pH, exchangeable Ca2+ and reduced exchangeable Al3+ as well as soil Al3+ saturation down to a 60 cm depth”
e1“soybean root growth”
Claim · model-written summary
Surface liming reduced exchangeable Al3+ and soil Al3+ saturation down to 60 cm.
- Taxon
- soybeanGlycine maxe1
- Treatment
- liminge0
- Outcome
- exchangeable Al3+ as well as soil Al3+ saturatione0
- Direction
- reducede0
- Qualifier
- down to a 60 cm depthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After nine years, liming increased pH, exchangeable Ca2+ and reduced exchangeable Al3+ as well as soil Al3+ saturation down to a 60 cm depth”
e1“soybean root growth”
Claim · model-written summary
Re-liming ameliorated soil acidity to 60 cm after two years.
- Taxon
- soybeanGlycine maxe1
- Treatment
- Re-liminge0
- Outcome
- soil aciditye0
- Direction
- amelioratione0
- Qualifier
- to a 60 cm depthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Re-liming, after two years, also provided soil acidity amelioration to a 60 cm depth”
e1“soybean root growth”
Claim · model-written summary
Surface lime decreased soybean total root length under no-till.
- Taxon
- SoybeanGlycine maxe0
- Treatment
- surface lime applicatione0
- Outcome
- total root length per soil surface areae0
- Direction
- decreasede0
- Qualifier
- under NTe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean total root length per soil surface area (0-60 cm) decreased with the surface lime application under NT”
Claim · model-written summary
Liming did not change Al concentrations in soybean roots and leaves.
- Taxon
- soybeanGlycine maxe0
- Treatment
- liminge0
- Outcome
- Al concentrations in the soybean roots and leavese0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in soil exchangeable Al3+ with liming did not change Al concentrations in the soybean roots and leaves”
Claim · model-written summary
Surface-applied lime increased Ca and Mg concentrations in soybean roots and leaves.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- roots and leavese0
- Treatment
- Surface-applied dolomitic limee0
- Outcome
- Ca and Mg concentrationse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Surface-applied dolomitic lime under NT brought an increase in Ca and Mg concentrations and a decrease in the Mn level in both soybean roots and leaves”
Claim · model-written summary
Surface-applied lime decreased Mn levels in soybean roots and leaves.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- roots and leavese0
- Treatment
- Surface-applied dolomitic limee0
- Outcome
- Mn levele0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Surface-applied dolomitic lime under NT brought an increase in Ca and Mg concentrations and a decrease in the Mn level in both soybean roots and leaves”
Claim · model-written summary
Surface liming did not influence soybean grain yield.
- Taxon
- SoybeanGlycine maxe0
- Treatment
- surface liminge0
- Outcome
- grain yielde0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean grain yield was not influenced by surface liming”
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