The change of moisture in Jerusalem archichocke tuber.

[摘要] 1. To what extent the change of moisture in tuber, exerts influences upon the cultivation, storage and utilization of Jerusalem Archichocke, has been studied. 2. Because of the non-existence of cork layer, tuber can easily exhale or absorb moisture. 3. To dry up the perfect tuber until it becomes constant in volume, it takes seventy to eighty days indoors, and thirty days outdoors. If the tuber is cut and dried, one day will be enough for the purpose. 4. For drying tuber, the period of December to January is preferable to that of March to April. The reason for the above is that, at the begining of spring relative humidity is least in the year. 5. When the dried tuber is soaked in water, it nearly restores to its original form in two or three days. 6. If the tuber is dried until the moisture in it becomes about ten per cent, there is no risk or deterioration even in rainy season. For the reason stated above, it is suited for storage and transportation as forage and raw material. 7. When the tuber is dried to suitable exent, germination is retained and the tuber falls into a state of compulsory dormance. Consequently, the consumption of nutriments is prevented, enabling the seed time to change. 8. If the dried tuber is used for seed, the tendency is observed that the growth is accelerated and the yield is increased. But if the tuber is dried excessively, the germinating power will be lost. 9. Close correlation of +0.99 has been found to exist between the specific gravity of oozings and the total amount of sugar contained therein.

[学科分类] 农业科学（综合）