チューリップの養分吸収に関する研究 : 植物体内三要素含量の季節的消長について

(1)With the variety William Pitt of Tulip grown by water culture, the seasonal change of contents of three elemental nutrients in different parts of the plant was examined.
(2)The percentage on dry matter of nitrogen phosphorus and potassium in the leaves, the flower stalk decreased gradually while phousphorus percentage increased at the late stage of the growth.
In the stock bulb, the seasonal change of nutritional concentrations was little as compared with that of the other parts.
The percentages of potassium and phosphorus showed little difference between fertilized aud non fertilized plot in all parts of pantt, but in the nitrogen percentage this difference was remarkable except for the stock bulb.
(3) The amounts of the all elements in the stock bulb continually deceased in both fertilized and non-fertilized plot after planting.
With the process of this consumption of the stock bulb, in the leaves and flower stalk of the fertilized plot the nutritional contents increased rapidly and reached its maximum in the middle of April. While in non-fertilized plot, this increase ratio was very low.
Then, after flowering period the amounts of three elements in the leaves and flower stalk bigan to decrease. On the other hand, at the same period the contents in the new bulb bigan to increase rapidly.
Such inclinations in the seasonal change of all three elements were about the same.
Total amount oi nutritional elements in whole plant increased gradually at first, then with the elongation of leaves and flower stalk its increase was hastened and reached the maximum in the middle of April.
This suggested that the absorption of the nutrients from the nutritional solution was made vigorously in this period.