1963 年 25 巻 1 号 p. 27-30
This study was conducted to investigate the effects of pan-breaking on physical properties of soil and beet yield for the third year after pan-breaking treatment. This was done on the experimental field at Hokkaido University in 1901.
The results were as follows;
1. Though there was not a significant difference in water content and porosity rate of soil between treated and untreated plots, the decrease of water spots on the soil surface indicated that the drainage effect of pan-breaking lasted for three years.
2. Soil hardness data were secured by the cone penetrometer. The equi-hardness curve shows that the chisel trace maintains its shape and softness in the third year after pan-breaking.
3. Pan-breaking treatment of soil gave increased top growth and moderately higher root yields of beet crop in the third year after treatment.