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Thermal insulation, leading to greater deposition of dew. In addition organic mulches also contribute to:
Forestrymedium
AEnhanced humification and microbial activity leading to higher nutrient availability
BImprovement of soil structure, by incorporation of plant residues and by encouraging soil fauna.
CMulching is of profound importance in dry regions
DEven in more humid climates it may have very beneficial effects with certain species, e.g., the poplar E. All of the above