Abstract
Rice and soy bean plants were cultivated under the controlled temperature of 30°C, 25°C and 20°C with the use of different root supporters, such as glass wool, agar gel, burnt chaff, quartz sand, sand, water and paddy soil. The interferences of the effects of the root supporters with the temperature effects on plant growth were analized, and following results were obtained.
1) Even under the same environmental condition, each of the root supporters brings remarkable difference in the plant height of rice and soy bean seedlings. The plant height of rice seedlings was highest in sand at 30°C and 20°C, and was also in paddy soil at 25°C. In glass wool, the plant height of rice seedlings was lowest at 30°C, 25°C and 20°C. The plant height of soy bean seedlings was highest in burnt chaff and was lowest in agar gel at 30°C, 25°C and 20°C.
2) There were appreciable differences in the temperature effect on the plant growth among the seedlings of rice and soy bean grown on the different root supporters. The temperature effect on plant height of rice seedlings was largest in glass wool and smallest in sand. The temperature effect on the plant height of soy bean seedlings was. largest in agar gel and smallest in burnt chaff. The temperature effect on dry weight of rice seedlings was largest in agar gel and smallest in burnt chaff. The temperature effect on dry weight of soy bean seedlings was largest in agar gel and smallest in glass wool. From these results, it could be estimated that the different natures of the root supporters resulted in bringing forth the differences in growth of the plant, and it is noticeable that the temperature effects on the plant growth were remarkably affected by root supporters.
