www.old.international-agrophysics.org / zeszyty


International Agrophysics
wydawca:Instytut Agrofizyki
im. B. Dobrzańskiego
PAN
w Lublinie
ISSN: 0236-8722


vol. 21, nr. 1 (2007)

poprzedni artykuł wróć do listy artykułów następny artykuł
Estimating trafficability of three Nigerian agricultural soils from shear strength-density-moisture relations Estimating trafficability of three Nigerian agricultural soils from shear strength-density-moisture relations
(pobierz wersję PDF)
K.O. Adekalu1, D.A. Okunade2, J.A. Osunbitan1
1 Department of Agricultural Engineering, Obafemi Awolowo University, Ile-Ife, Nigeria
2 School of Agriculture, Food and Rural Development, Newcastle University, NE 1 7RU, UK

vol. 21 (2007), nr. 1, pp. 1-5
streszczenie The dry density and shear strength of Iwo (Alfisols), Egbeda (Entisols) and Ondo (Ultisols) soil series in south-western Nigeria were measured at different compaction efforts and moisture contents. Results indicate that dry density and shear strength increased considerably with increase in compactive effort (P < 0.05). Maximum values of dry density were reached at predetermined critical moisture content for compacting the soils, while the strength decreased continuously with increasing moisture content. Superimposing the two curves of dry density and shear strength versus moisture content, respectively, gave the best compromise moisture content for trafficability of the soils. Regression equations were derived to relate the equilibrium moisture content for trafficability of the soils to soil components and dry density.
słowa kluczowe compactive efforts, trafficability, moisture content, shear strength, dry density