Japanese Journal of Tropical Agriculture
Online ISSN : 2185-0259
Print ISSN : 0021-5260
ISSN-L : 0021-5260
Volume 32, Issue 3
Displaying 1-12 of 12 articles from this issue
  • II Effect of saline water concentrations on the yield of Atriplex nummularia in sandy soil
    Katsuo SUGIMOTO, Yasutaka UCHIYAMA, Yoshichika TAKEUCHI, Masao TOYAMA
    1988Volume 32Issue 3 Pages 129-139
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
    Oldman saltbush (Atriplex nummularia LINDL.) is native to the Australian arid and semi-arid areas and is used as an important grazing grass for sheep. Experiments were carried out in plants grown in a container/pot with sandy soil in the glasshouse of the Sand Dune Research Institute, the plants were irrigated with four kinds of water, i. e. fresh water (control), simple saline water (NaCl), compound saline water and sea water during four cropping seasons (Tables 1 and 2) .
    The amount of applied was 1.1mm, 2.7mm, 0.9mm and 3.0mm/a day for the first, second, third and fourth cropping seasons respectively. Electric conductivity (EC) and NaCl % of the water showed a decrease in the following order: NaCl water 2.7%>Sea w. 75% (NaCl 2.3%) >Sea w. 50% (NaCl 1.6%) >NaCl w.1.4%>NaCl w. 1%>Sea w. 25% (NaCl 0.82%) >NaCl 0.7%≅Compound saline w. 1% (NaCl 0.68%) (Table 2) . The results obtained are as follows:
    1.The increment of plant growth and yield was more pronounced in plants grown in the various saline water plots as compared with those grown in fresh water except for the plot with a concentration of 2.7% of NaCl in water and in the 75% sea water plot. Irrigation of plants with water containing salt at various concentrations increased the fresh weight, dry leaf weight, leaf/stem ratio and water content per unit leaf area, and decreased the percentage of dry matter as compared with the values of the corresponding parameters in the control (Table 3 and Figs. 1 and 2) .
    Yield increment was 7-43% for the plants grown in the plots with 0.7, 1 and 1.4% of NaCl in water, 48-61% in the plots with 25 and 50% of sea water and 54-79% in the plot with 1% of compound salt in water, respectively as compared with the values of the control. Therefore watering in using compound saline water was more effective than when simple saline water was used. Due to reduction in plant growth caused by the treatment with water containing high salt concentrations, the yield decreased by 10% inv the plot with 75% of sea water and by 40% in the plot with 2.7% of NaCl in water, respectively as compared with the values of the control. These results indicate that A. nummularia exhibites a high tolerance to salinity.
    2.Contents of minerals increased in the leaves as compared with the values in the stems (Table 5 and Fig. 3) . Though the contents of P and K decreased with the increase of the salt concentrations, the values of Na, Cl, Ca, and Mg particularly Na and Cl in the leaves increased in all the saline water plots as compared with the values of the control when the salt concentration increased. The content of Na was highly correlated with that of Cl (Table 7) .
    Contents of Na and Cl in the plant also markedly increased in all the saline water plots as compared with the values of the control when the salt concentration increased. The highest value of Na plus Cl was 26% both in the plot with 1.4% of NaCl in water and in that with 75% of sea water. Total contents of minerals also increased in all the saline water plots as compared with the values of the control (Table 6) . On the other hand, comparison between all the saline water plots and fresh water plots, showed that in the forms the K/Na ratio ranged between 0.16 and 0.58 in the former, whereas the K/Na ratio was much higher in the latter and ranged between 0.79 and 3 (Table 6) . The results presented above illustrate the special characteristics of this halophyte plant.
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  • Jinda SORNSRIVICHAI, Chiaki OOGAKI, Hiroshi GEMMA
    1988Volume 32Issue 3 Pages 140-146
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
    Storage life of pear fruit cv. Pien Pu when stored in a water-roof pond passively cooled room at 9-17°C and 85-90%RH, was extended to about one month compared with 7-10 days at normal temperature. The qualities, in particular on the fruit firmness and skin color, were also superior to the fruits stored in a controlled chamber at 17°C. High relative humidity (RH) condition of the roof pond room might have contributed to the superior qualities of the fruit. The storage life of fruits coated with TAL-Prolong wax was extended to 50 days and delayed the ripening process as show evidence in the rates of decrease of firmness and chlorophyll breakdown, and delayed increase of total soluble solids (TSS) . Low pressure condition, in which O2 partial pressure was reduced, effectively kept the fruit unripe for the 100 days of storage period. The fruit firmness and green skin color was retained and increase of TSS significantly slowed down. After 100 days the fruits were subjected to abnormal internal senescence and breakdown.
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  • Naoki UTSUNOMIYA, Shoji SHIGENAGA
    1988Volume 32Issue 3 Pages 147-153
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
    Young plants of giant granadilla and yellow passion fruit were treated with 0, 25 and 50 mM NaCl for 6 weeks. Although growth reduction and leaf injury were caused by NaCl in giant granadilla, the growth of yellow passion fruit was not affected by salt treatments. NaCl increased the leaf stomatal resistance of giant granadilla but had little effect on that of yellow passion fruit. Cl and Na accumulations increased in the NaCl treated plants of both species. In giant granadilla, relatively high concentrations of these two ions retained in the root and Na translocation to upper leaves was inhibited. On the other hand, both ions remarkably accumulated exclusively in the leave in yellow passion fruit.
    These results suggest that giant granadilla is less tolerant to salinity, and yellow passion fruit has a high salt tolernce by adapting to the salt accumulation in the plants.
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  • Takao KASHIWABARA
    1988Volume 32Issue 3 Pages 154-160
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • —The possibilities of ensuring water resources and improvement of agricultrual productivity by mini-farm pond—
    Naoki UTSUNOMIYA
    1988Volume 32Issue 3 Pages 161-168
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1988Volume 32Issue 3 Pages 169-171
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1988Volume 32Issue 3 Pages 171-175
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1988Volume 32Issue 3 Pages 175-176
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1988Volume 32Issue 3 Pages 176-178
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • 1988Volume 32Issue 3 Pages 178-194
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1988Volume 32Issue 3 Pages 195-196
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1988Volume 32Issue 3 Pages 197-198
    Published: September 01, 1988
    Released on J-STAGE: March 19, 2010
    JOURNAL FREE ACCESS
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