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Treatments, applied in one meter square wooden frames, were snow at 7.6, 15.2 and 30.5 cm deep, straw at 11 mT/ha, straw at 2.2 mT/ha, straw at 2.2 mT/ha covered with clear polyethylene, clear polyethylene and no mulches. The frames were covered during storms to exclude unwanted snow and keep mulching materials dry. Temperatures below the mulches were recorded throughout two winters. Temperatures under 30.5 cm of snow did not go below -3°C when exposed soil surface temperatures were -22°. Temperatures below 11 mT/ha of straw and 2.2 mT/ha straw plus polyethylene were comparable to temperatures below 15.2 cm of snow. Straw at 2.2 mT/ha provided about the same protection as 7.6 cm of snow cover while clear polyethylene alone provided little insulation.

COMPARATIVE WINTER INSULATING VALUE OF SEVERAL SNOW DEPTHS, STRAW AND PLASTIC MULCHES