Abstract
In Brazil extensive areas are covered with pine forests, planted for pulp and paper production. This industry generates solid alkaline waste, such as dregs. The application of this dregs to forest soils is an alternative for soil acidity correction and plant nutrient supply, as well as a solution for its proper disposal. The purpose of this study was to compare the residual effect of surface application of dregs and dolomitic lime on (a) changes in the physical and chemical properties of an acidic soil and (b) pine tree development. The experiment was carried out in 2004 in Bocaina do Sul, Santa Catarina, consisting of the application of increasing dreg and lime rates to a Pinus taeda L. production area, on a Humic Cambisol, in a randomized block design with four replications and 10 x 10 m plots. The treatments consisted of levels of soil acidity amendments corresponding to the recommendations by the SMP method to reach pH 5.5 in the 0-20 cm layer, as follows: no soil amendment; dregs at 5.08 (1/4 SMP), 10.15 (1/2 SMP) and 20.3 Mg ha-1 (1 SMP); and lime at 8.35 (1/2 SMP) and 16.7 Mg ha-1 (1 SMP). Soil layers were sampled in 2010 for analyses of soil chemical and physical properties. The diameter at breast height of the 6.5 year old pine trees was also evaluated. Surface application of dregs improved soil chemical fertility by reducing acidity and increasing base saturation, similar to liming, especially in surface layers. Dregs, comparable to lime, reduced the degree of clay flocculation, but did not affect the soil physical quality. There was no effect of the amendments on increase in pine tree diameter. Thus, the alternative to raise the pH in forest soils to 5.5 with dregs is promising for the forestry sector with a view to dispose of the waste and increase soil fertility.
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Claims 6
Claim · model-written summary
Dregs reduced soil acidity, similarly to lime.
- Treatment
- Surface application of dregse0
- Outcome
- aciditye0
- Direction
- reducinge0
- Qualifier
- surface layerse0
- Comparator
- liminge0
PinusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pine”
e0“Surface application of dregs improved soil chemical fertility by reducing acidity and increasing base saturation, similar to liming, especially in surface layers”
Claim · model-written summary
Dregs increased soil base saturation, similarly to lime.
- Treatment
- Surface application of dregse0
- Outcome
- base saturatione0
- Direction
- increasinge0
- Comparator
- liminge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pine”
e0“Surface application of dregs improved soil chemical fertility by reducing acidity and increasing base saturation, similar to liming, especially in surface layers”
Claim · model-written summary
Dregs reduced clay flocculation to a comparable degree as lime.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pine”
e0“Dregs, comparable to lime, reduced the degree of clay flocculation, but did not affect the soil physical quality”
Claim · model-written summary
Dregs did not affect soil physical quality.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pine”
e0“Dregs, comparable to lime, reduced the degree of clay flocculation, but did not affect the soil physical quality”
Claim · model-written summary
Amendments did not affect the increase in pine diameter.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pine”
e0“There was no effect of the amendments on increase in pine tree diameter”
Claim · model-written summary
The authors consider dregs promising for raising forest soil pH to 5.5 and increasing fertility.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pine”
e0“the alternative to raise the pH in forest soils to 5.5 with dregs is promising for the forestry sector with a view to dispose of the waste and increase soil fertility”
The same questions in other papers
other · growth · PinusPositive and negative results
1 paper in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 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.