Takeshi Tanabe

Studies on the Paper-pot Transplanting of Rice Plant : I. Effects of paper-pot transplantation on the growth and yield of rice plant

Having an intension to develop a rice transplanter in the back ground, this experiment was carried out to examine the influence of the paper-pot transplanting of rice on its growth and yield. This practice is familiar with the transplantation of sugar beet. Another purpose of this experiment was to establish a cultivation method of rice by using a paper-pot. The experiment was carried out in the paddy field of Atsugi farm during a period of 1966 to 1967. As a result, the following findings have been obtained : I) A paper-pot accelerated the growth of rice seedlings in a nursery bed, and the growth of rice in the initial period in the paddy field became vigorous. II) The direction of root development was regulated by the paper-pot, and the distribution area of roots tended to concentrate near the surface of ground. III) The growth was depressed after about the terminal period of the vegetative growth, thus resulting in the decline of the total dry matter weight and of ripening and the grain yield, but any significant difference was not observed. For futher development of the paper-pot cultivation of rice, such important problems as appropriate handling of water, suitable period of earthing-up, method of top-dressing and so on must be solved.

Studies on the Utilization of Bentonite on Crop Cultivation : (1) On the Growth of Crops supplied with Bentonite : (2) On the Swelling of Bentonito affected by Solutions of Different Commercial Fertilizers.

From the results of experiment, it may be concluded that the effect of Bentonite on the growth and yield of crop varies with the menthods of applying to the soil. Also it may be presumed that the action of Bentonite depends on both its base exchange capacity and the density and kind of fertilizers used.