Abstract
Tillage system affects many soil parameters that may influence plant growth. This study evaluated the effect of liming on corn (Zea mays L.) yield and chemical characteristics of a Humic Hapludox (clayey, kaolinitic, goethitic, termic) under both conventional tillage (CT) and no-tillage (NT) systems. Rates of dolomitic lime, from 0 to 18 t ha−1, were plowed into the soil in 1992 in southern Brazil; our study was conducted from 1996 through 1999. Lime rate was allocated to subplots, and tillage systems to main plots, in a split-plot design. Corn yield increased with liming in all years and was higher with CT than with NT in 2 of 3 yr. Averaged across years and systems, liming increased yield by 66%, which ranged from 4.4 to 7.8 t ha−1. The highest average yield (7.8 t ha−1) was obtained at pH 6.5; yields at pH 6.0 or 5.5 were 97 and 89% of the maximum, respectively. Liming reduced soil organic matter (SOM) in both systems, but nutrients (P, K, Ca, Mg, Fe, Cu, Zn, and Mn) remained above sufficiency on all treatments. Aluminum, pH, SOM, and other nutritional parameters did not differ between tillage systems, partly because limestone was initially incorporated in all plots and partly due to dilution effects in the plow layer because sampling was not stratified in small depths. Some soil restriction impaired by absence of plowing, probably increases in bulk density, offset the benefits of NT on plant growth and was responsible for the smaller yield in this tillage system compared with CT.
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Claims 10
Claim · model-written summary
Corn yield increased with liming in all years.
- Taxon
- Corn
Zea mays subsp. mayse0 - Treatment
- liminge0
- Outcome
- yielde0
- Direction
- increasede0
- Qualifier
- in all yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn yield increased with liming in all years”
Claim · model-written summary
Corn yield was higher under conventional tillage than under no-tillage in 2 of 3 years.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- CTe0
- Outcome
- yielde0
- Direction
- highere0
- Qualifier
- in 2 of 3 yre0
- Comparator
- NTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn yield increased with liming in all years and was higher with CT than with NT in 2 of 3 yr”
Claim · model-written summary
Averaged across years and systems, liming increased corn yield by 66%, with yields ranging from 4.4 to 7.8 t ha-1.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- liminge0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 66%e0
- Qualifier
- ranged from 4.4 to 7.8 t ha−1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Averaged across years and systems, liming increased yield by 66%, which ranged from 4.4 to 7.8 t ha−1”
Claim · model-written summary
The highest average corn yield, 7.8 t ha-1, was obtained at soil pH 6.5.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- highest average yielde0
- Value
- 7.8 t ha−1e0
- Qualifier
- pH 6.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“The highest average yield (7.8 t ha−1) was obtained at pH 6.5”
Claim · model-written summary
Corn yield at pH 6.0 was 97% of the maximum yield.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- yieldse0
- Value
- 97e0
- Qualifier
- pH 6.0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“yields at pH 6.0 or 5.5 were 97 and 89% of the maximum, respectively”
Claim · model-written summary
Corn yield at pH 5.5 was 89% of the maximum yield.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- yieldse0
- Value
- 89%e0
- Qualifier
- 5.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“yields at pH 6.0 or 5.5 were 97 and 89% of the maximum, respectively”
Claim · model-written summary
Liming reduced soil organic matter in both tillage systems.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Liminge0
- Outcome
- soil organic matter (SOM)e0
- Direction
- reducede0
- Qualifier
- in both systemse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Liming reduced soil organic matter (SOM) in both systems”
Claim · model-written summary
Soil nutrients (P, K, Ca, Mg, Fe, Cu, Zn and Mn) remained above sufficiency on all treatments.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- nutrients (P, K, Ca, Mg, Fe, Cu, Zn, and Mn)e0
- Qualifier
- remained above sufficiency on all treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“nutrients (P, K, Ca, Mg, Fe, Cu, Zn, and Mn) remained above sufficiency on all treatments”
Claim · model-written summary
Aluminum, pH, SOM and other nutritional parameters did not differ between tillage systems.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- tillage systemse0
- Outcome
- Aluminum, pH, SOM, and other nutritional parameterse0
- Direction
- did not differe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Aluminum, pH, SOM, and other nutritional parameters did not differ between tillage systems”
Claim · model-written summary
The authors attribute the smaller yield under no-tillage than conventional tillage to soil restriction from the absence of plowing, probably increased bulk density.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- absence of plowinge0
- Outcome
- smaller yielde0
- Qualifier
- probably increases in bulk densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Some soil restriction impaired by absence of plowing, probably increases in bulk density, offset the benefits of NT on plant growth and was responsible for the smaller yield in this tillage system compared with CT”
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See all 1,099 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.