抄録
1 Run off soil caused by melting snow was measured on the tillage apple orchards in Yamagata Village, Minamitsugaru-County, Aomori Prefecture during January to March in 1951.
2. Special three plots, 7.2 feet wide and 30 feet long, were established on the 28 per cent Slope. The side and upper ends of three plots were formed by wood borders projecting 25 ems. above the sur-face of the soil and extending 25 cms. into the soil, At the lower ends of each plot a concrete tank to catch everything that run off were built.
3. First melting snow were caught in January 31 and last one in March 25. Melting snow water which were caught into the tank was 12.4 per cent of total water in snowdrift on March 15 and a larger part of the run off soil was caused during 15 to 25 in March.
4. Entire loss of soil by melting snow was 184 kgs. in air dry matter per acre in 1951.
