加里塩の濃度を考慮せる甘藷の培養比較研究

抄録

In order to ascertain the physiological rolls of potassium upon the growth, yield and the chemical compositions of products of sweet potato, these experiments carried out by the author with the water culture. The materials (variety "Taihaku Saitama No. 1") were cultured in the Wagner's pots, each holding the nutrient solution, which contained different amount of potash salts and was kept approximately the same pH value. The sand box were used for the formation of tuberous roots. The results are summerized as follows : 1) The yields of tuberous roots, leaves and vines paralleld to the concentrations of potash salts in the nutrient solution. 2) The effect of heavy potash supply on the leaves and vines was much larger than that of the tuberous root in a plant. 3) The sugars and starch contents in the vegetative organs of the potassium-deficient plants were markedly lower. 4) The percentage of potassium within the plants was directly proportional to the amount added in the nutrient solutions. 5) The potash-deficient plants contained higher percentages of phosphorus, calcium and iron than the plants supplied with potash salts. 6) The correlations between potassium and calcium or iron were found by the analyse of the vegetative Organs.