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Ley, G J and Laryea, K B (1994) Spatial variability in penetration resistance of a hardsetting tropical alfisol. Soil & Tillage Research, 29 (4). pp. 367-381. ISSN 0167-1987
Ley, G J and Laryea, K B (1994) Spatial variability in penetration resistance of a hardsetting tropical alfisol. Soil & Tillage Research, 29 (4). pp. 367-381. ISSN 0167-1987