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In the southwest of Iran over 130,000 ha of land are under sugarcane (Saccarum officinarum). In these sugarcane fields, about 400 kg ha−1 diamonium phosphate (DAP) and 400 kg ha−1 urea are applied annually. Four sugarcane growing sites were selected for this study: Haft-tapeh, Karoon, Shoeibieh and Ghazali with cultivation histories of 36, 20, 2 and 1 years, respectively. For each area, soil samples...
Soil clays differing widely in mineralogy were individually mixed with sand and silt fractions from an Alfisol. The mixtures dominated by Ca 2+ were wet and dried ten times to simulate field conditions and promote microaggregation of the soils. Compacted cores were prepared at fixed water contents and tensile strengths of the cores were measured before and after a number of wetting...
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