Abstract
Under different combination of silicic acid (colloidal and solid state) and potassium chloride in the nutritive solution a series of water culture of paddy rice was carried out. As we used tap water for diluting nutritive solution, the presence of small quantities of dissolved silicic acid was inevitable. We, however, named it the plot of none-addition of silicic acid. In the case of none-addition of silicic acid, the increased supply of potassium chloride to some extent proved to be injurions to the growth of paddy rice, but the addition of colloidal silicic acid to such a plot greatly accerelated the growth of paddy rice, and thereby gave torelablly beneficial effect for the production of unhulled rice especially. The chemical constituents of the s'raw of paddy rice i. e. moisture, total nitrogen, proteid nitrogen, phosphoric acid, potassium oxide, silicic acid, crude fat, starch and crude fiber were estimated. Among these constituents the moisture and crude fat were decreased by the addition of large guantities of colloidal silicic acid, while the inverse was true so far as silicic acid is concerned. The more potassium was given to the solution, the larger contents of potassium was found in the straw of the paddy rice in such nutritive solutions. The potassium contents were independent of the addition of silicic acid.
