Effect of ultrasonic waves on farm crops. : (I) On germination and early growth.

[摘要] 1. In germination and early growth, conspicuous difference was not recognized among these three cyclic wave numbers of Ultrasonic Waves. 2. As for germination itself (both average day number for germination and germination percentage), very promotive result was not obtained in the experimented conditions. 3. As for early growth, its result was now promotively and now suppressively depending on the stimulus intensity of Ultrasonic Waves. Promotive result was generally obtained by radiating for the short time (one minute of five) Ultrasonic Waves upon the seeds soaked in water and then contained in watered vessels. In this case it is easy to be mistaken that germination itself has been promoted. On the contrary early growth was suppressed in the case when intensive stimulus (for instance ten minutes of more radiation) was given. 4. More than five minutes seemed to have no meaning on the effect of Ultrasonic Waves on experimented farm crops in germination and early growth. 5. Clear qualitative difference was not recognized between treatment plot and control on outer morphological characters of experimented samples especially young seedlings except the quantitative one on the plant height, the root volume and soforth.

[学科分类] 农业科学（综合）