Abstract
Cabbage varieties and strains were grown on the three regions of different altitude in Nagano prefecture (Nagano or Suzaka 360m, Fujisato 760m, and Sugadaira 1, 390m above the sea-level) in 1948, 49, and 50, and were tested for their adaptability to the different ecological conditions of the three regions during summer seasons. The experimental results obtained were as follows :
1. Although cabbage was rather an insensitive crop to high temperature, its most favourable growing temperature range was from 15 to 20°C in daily mean. In the region of low altitude, where the summer temperature exceeded the optimum temperature range, cabbage growth was retarded during summer season, and severely checked when mean daily temperature exceeded 25°C. In the region higher than 1, 000m above the sea level, where mean daily temperature was about 20°C even in hottest season, cabbage grew up very vigorously during summer seasons.
2. In the cool region of high altitude, the differences in the times of maturity or the weight of head between the early varieties and late ones were rather small, while in the regions of low altitude where the summer temperature exceeded the optimum range for cabbage growth, the diffences between the two groups were large.
3. Some varieties and strains were less sensitive to high temperature than the others.
