Japanese Journal of Tropical Agriculture
Online ISSN : 2185-0259
Print ISSN : 0021-5260
ISSN-L : 0021-5260
Volume 13, Issue 2
Displaying 1-12 of 12 articles from this issue
  • V Changes of nutrient absorption and nutrient content in the process of growth of jute plant
    Goro NISHIKAWA, Kunio KAGAWA
    1970 Volume 13 Issue 2 Pages 71-75
    Published: January 25, 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
    1) In this study Change of nutrients absorption and the contents in jute plant during the process of growth were investigated.
    2) Total dry weight of plant increased through the course of growth, but the tendency of increase in each part of plant was different. Total dry weight continued to increase during the course of plant growth in every part except leaves, in which it did till the early capsule stage and afterwards tended to decrease reversely by degrees.
    And so this tendency in both parts of pith with xylem and capsule was particularly distinct.
    3) In dry weight, change in rates of each part to the whole plant body was relatively in fiber and non-fibrous part in skin. That in leaves decreased as plant grew, while that in pith with xylem part and capsule part increased.
    4) Contents of N, P2O5 and K2O in each part of plant body continued to decrease by degrees through the course of growth, and in these tendencies some differences were recognized among the parts of plant body and also the kinds of nutrients
    5) Quantities of N and P2O5 absorbed increased continuously till the seed maturation stage, on the other hand in case of K2O it continued to increase till immediately before the seed maturation stage and afterwards decreased more or less.
    6) The nutrient absorption during the process of growth was most vigorous for the period from flowerbud-bearing stage to beginning stage of blooming.
    7) As regards the rates of N, P2O5 and K2O contained in each part of plant to those contained in whole plant body the rate of that in leaves decreased by degrees, in case of capsule however, it increased during the growth period.
    Those in both parts of skin and pith with xylem changed slightly through the cousse of growth.
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  • VI Change of nutrient absorption and nutrient content in the process of grwoth of kenaf plant
    Goro NISHKAWA, Kunio KAGAWA
    1970 Volume 13 Issue 2 Pages 76-80
    Published: January 25, 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
    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.
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  • [in Japanese]
    1970 Volume 13 Issue 2 Pages 81-85
    Published: January 25, 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese], [in Japanese], [in Japanese]
    1970 Volume 13 Issue 2 Pages 86-98
    Published: January 25, 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • 1970 Volume 13 Issue 2 Pages 99-110
    Published: January 25, 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1970 Volume 13 Issue 2 Pages 111-118
    Published: January 25, 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1970 Volume 13 Issue 2 Pages 118-120
    Published: January 25, 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1970 Volume 13 Issue 2 Pages 121-135
    Published: January 25, 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • 1970 Volume 13 Issue 2 Pages 137d
    Published: 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • 1970 Volume 13 Issue 2 Pages 137c
    Published: 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • 1970 Volume 13 Issue 2 Pages 137b
    Published: 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • 1970 Volume 13 Issue 2 Pages 137a
    Published: 1970
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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