STUDIES ON THE QUALITY OF UPLAND RICE. : II On the Germination of Glutinous Hulled Upland Rice Grains of Different Transparency.

[摘要] 1. Five glutinous upland rice line bred at the Odate Agricultural Improvement Experiment Station of Ministry of Agriculture and Forestry were cultivated customarily and rice grains were raised at that station in 1949. Semi-transparent hulled rice grains were sorted from opaque hulled rice grains for each line and them they were sown twice separately in petri dishes containing the washed river fine sand in April 1950 and these petri dishes were layed in a thermostat. 2. Germinating capacity of opaque grains at 15°C was greater than that of semi-transparent grains except one line. But at 30°C such relation was opposite. Germinating capacity at 30°C was far greater than its capacity at 15°C. Moreover, the germinating capacity of opaque grains at 15°C increased with decreasing of the semi-transparent rice grains among total grains for each line except one line. But in other cases, any relation could not be seen between germinating capacity and the mixing percentage of semi-transparent grains in total grains. Germinating speed of opaque rice grains was greater than its speed of semi-transparent grains at 15°C and its speed of semi-transparent grains was greater than that of opaque grains at 30°C. In the next place, reverse relation existed between germinating speed of opaque grains at 15°C and the mixing percentage of semi-transparent grains in total grains except one line and at 30°C positive relation existed between its speed and the mixing percentage except one line. But any relation could not be found beween germinating speed of semi-transparent grains and its mixing percentage. Germinating speed at 30°C was greater than its speed at 15°C. 4. 'Keimgeschwindigkeit' of opaque grains of 3 lines at 15°C was smaller than that of semi-transparent grains, but it was greater than that of semi-transparent grains for 2 lines. At 30°C its 'Keimgeschwindigkeit' of 3 lines was greater than that of semi-transparent grains and for one line it was smaller than that of semi-transparent grains and also for one line any relation could not be seen between 'Keimgeschwindigkeit' and transparency. 'Keimgeschwindigkeit' of some lines varied with temperature and for other lines it did not vary. Any relation could not be seen between 'Keimgeschwindigkeit, and mixing percentage of semi-transparent grains in total grains.

[学科分类] 农业科学（综合）