Effects of tire inflation pressure and field traffic on compaction of a sandy clay soil as measured by cone index and permeability. · Knowledge Library
What changed what, as the paper reports it. Grouped by the measured property.
soil cone index
↑ 13
↑increase
tractor wheeling (one, two and three passes) vs. initial state E0significance not stated · 0–25 cm · Higher Agronomic Institute of Chott Meriem · 0-25 cm; first and second passes, 50/100/150 kPa; moisture differs across passes; third-pass significance recorded separately
treatment 2,240 vs. control 750 kPa (+198.7 %) · 10–10 cm · one pass,100kPa
treatment 2,580 vs. control 1,480 kPa (+74.32 %) · 20–20 cm · one pass,100kPa
treatment 450 vs. control 70 kPa (+542.9 %) · 0–0 cm · one pass,150kPa
treatment 2,290 vs. control 750 kPa (+205.3 %) · 10–10 cm · one pass,150kPa
treatment 2,720 vs. control 1,480 kPa (+83.78 %) · 20–20 cm · one pass,150kPa
treatment 350 vs. control 70 kPa (+400 %) · 0–0 cm · one pass, 50 kPa
treatment 2,210 vs. control 750 kPa (+194.7 %) · 10–10 cm · one pass, 50 kPa
treatment 2,390 vs. control 1,480 kPa (+61.49 %) · 20–20 cm · one pass, 50 kPa
Source · p. 4
“These results show that the pass of a tire subjected to different inflation pressures on a tilled soil increases the soil cone index.”
↑increase
150 kPa tire inflation vs. 50 kPa tire inflationsignificance not stated · 0–25 cm · Higher Agronomic Institute of Chott Meriem · 0-25 cm; repeated tractor passes; 150 versus 50 kPa tire inflation; pressure ANOVA is not a pairwise test
Numbers
treatment 450 vs. control 350 kPa (+28.57 %) · 0–0 cm · one pass
treatment 2,290 vs. control 2,210 kPa (+3.62 %) · 10–10 cm · one pass
treatment 2,720 vs. control 2,390 kPa (+13.81 %) · 20–20 cm · one pass
treatment 1,130 vs. control 680 kPa (+66.18 %) · 0–0 cm · third pass
treatment 2,730 vs. control 2,220 kPa (+22.97 %) · 5–5 cm · third pass
treatment 2,200 vs. control 1,680 kPa (+30.95 %) · 10–10 cm · third pass
Source · p. 4
“This increase is higher under a pressure of 150 kPa and the upper horizons are the most affected.”
↑increase
tractor wheeling (one, two and three passes) vs. initial state E0significant · 0–25 cm · third tractor pass · Higher Agronomic Institute of Chott Meriem · 0-25cm, all50/100/150kPa; third-pass versusE0; explicit significant increase in results, alpha.05 methods; moisture9.8% versus6.6%initial
Numbers
treatment 680 vs. control 70 kPa (+871.4 %) · 0–0 cm · third pass,50kPa
treatment 1,680 vs. control 750 kPa (+124 %) · 10–10 cm · third pass,50kPa
treatment 830 vs. control 70 kPa (+1,086 %) · 0–0 cm · third pass,100kPa
treatment 1,840 vs. control 750 kPa (+145.3 %) · 10–10 cm · third pass,100kPa
treatment 1,130 vs. control 70 kPa (+1,514 %) · 0–0 cm · third pass,150kPa
treatment 2,200 vs. control 750 kPa (+193.3 %) · 10–10 cm · third pass,150kPa
Source · p. 4
“Results obtained after the third pass of the tractor (average moisture content of 9.8%) are presented in Fig. 2c. These results clearly indicate a significant increase in soil cone index for all the considered depths.”
soil permeability
2
↓decrease
tractor wheeling (one, two and three passes) vs. initial state E0significance not stated · 0–30 cm · Higher Agronomic Institute of Chott Meriem · 0-30 cm Porchet borehole; one to three passes at 50/100/150 kPa; abstract significance not established by displayed pairwise tests
Source · p. 5
“Fig. 3 shows that soil permeability is reduced by 7.4%, 25% and 57.6% following the first pass of the tractor, 16.3%, 30.5% and 60% following the second pass, and 32%, 36% and 68% following the third pass under the tire inflation pressures of 50, 100 and 150 kPa, respectively.”
↓decrease
150 kPa tire inflation vs. 50 kPa tire inflationsignificance not stated · 0–30 cm · Higher Agronomic Institute of Chott Meriem · 0-30 cm Porchet borehole; one to three passes; 150 versus 50 kPa inflation
Source · p. 5
“Also, the more the tires are inflated, the less the soil is permeable.”
