Studies on Respiratory Mechanism of Roots in Rice Plants Growing on Submerged Paddy Fields : (5) The effects of soil solution, percolated through paddy field, upon the growth of rice seedlings (1)

The influence of soil solution, percolated through paddy fields with 1 meter deepness from surface, upon the growth of rice seedlings was studied. The results obtained are as follows; (1) When the percolated solution suspended without air, sealed with liquid paraffin, no effects of it on the growth of rice seedlings were recognized. (2) When the solution touched the air (using no treatment), its effects were very remarkable, this fact might mean that the oxygen in the solution is very important for the growth of rice plants. (3) By artificial percolation the rice roots developed to some extent, therefore, the vertical moving of soil solution in the field was considered to be desirable for a favourable growth of rice plants.