Abstract
1) The purpose of this experiment is to investigate the process of nutrient absorption and changes in nutrient contents in plant during the course of growth in kenaf
2) The total dry weight of was recognized to increase as the plant grows to the highest value in the capsule completion stage, and afterwards it decreased gradually. The increasing tendency, however depends on the part of plant the highest values in parts of leaves and pith with xylem were recognized in the capsule completion stage, and in parts of capsule, fiber and non-fibrous part in skin, it was at the seed maturation stage
3) With the aim to investigate change of dry weight during the courss of plant growth, the occupied rates of each part of the plant to whole plant body were investigated.
The occupied rate of leaves tended to decrease gradually through the process of growth while in capsele part a considerable increase was observed. Those in the fiber part and non-fibrous part of skin continued to increase from the flower bud-bearing stage to the beginning stage of blooming, indicating slight change afterwards. On the other hand, the change of the rate in pith with xylem was comparatively small during the whole period of growth.
4) Contents of N, P2O5 and K2O decreased by degrees through the course of plant growth in every part except capsele.In capsule the content of N tended to increase but contents of P2O5 and K2O scarcely changed during the course of growth.
5) The total amount of N and K2O absorbed by plant reached highest value at the capsule completion stage.
Those highest values were estimated to be 220 kg/ha in N and 475 kg/ha in K2O. As to P2O5 on the other hand, it increased by degrees till the seed maturation stage and the highest value was estimated about 50 kg/ha.
6) The rate of nutrient absorption in the process of growth of kenaf plant was recognized most vigorous from the flower bud-bearing stage to the capsule completion stage.
7) As to the proportion of N, P2O5 and K2O amounts contained in each part of plant to amounts in whole plant, those of all 3 elements in leaves decreased rapidly and those in pith with xylem decreased gradually those in capsule, on the other hand, increased. In case of skin, the proportion of N and K2O continued to increase from the flower bud-bearing stage to the beginning stage of blooming, afterwards they kept a stable level, that of P2O5 however continued to increase till the beginning stage of blooming end decreased afterwards.
8) From the above facts, it is said that kenaf plant absorbs much more nutrients than jute plant.
