Journal of Japanese Society of Turfgrass Science
Online ISSN : 1884-4022
Print ISSN : 0285-8800
ISSN-L : 0285-8800
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Volume 28, Issue 2
Displaying 1-10 of 10 articles from this issue
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  • Effects of 5-aminolevulinc acid on the growth of manilagrass and bentgrass
    Yasushi HOTTA, Tohru TANAKA, Makoto KONNAI, Yasutomo TAKEUCHI
    2000 Volume 28 Issue 2 Pages 97-102
    Published: March 31, 2000
    Released on J-STAGE: June 08, 2010
    DOIhttps://doi.org/10.11275/turfgrass1972.28.97
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    Effects of 5-aminolevulinic acid (ALA) on the growth of manilagrass and bentgrass (Penncross) were investigated. Foliar application of ALA at low concentrations such as 30-100ppm showed promotive effectiveness on the growth and photosynthesis of manilagrass. When the compound was applied at early October, it prevented discoloring of manilagrass in early winter and it promoted sprouting and greening of the turfgrass in the following spring.
    The promotive effectiveness of ALA were also observed in bentgrass, when the compound was applied at 5 -10ppm. Bentgrass were more sensitive than manilagrass to ALA treatment. Promotive effectiveness of ALA on these turfgrasses might be caused by the properties of stimulation of photosynthesis and suppression of respiration.
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  • Responses of warm-season turfgrasses and turf weeds to fertilization
    Yoshito ASANO, Yasuko ICHIKAWA
    2000 Volume 28 Issue 2 Pages 103-111
    Published: March 31, 2000
    Released on J-STAGE: June 08, 2010
    DOIhttps://doi.org/10.11275/turfgrass1972.28.103
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    The responses of 6 warm-season turfgrasses and 12 turf weeds to fertilization were investigated in a pot experiment. The relationships between plant growth and fertilization were well represented using the inverse quadratic: y= (b0+b1x) / (1+b2x+b3x2) . From each regression curve, the“low fertilization response” (F50 / Fmax) was calculated. It appeared that turfgrasses generally have a higher“low fertilization response”and lower maximum fertilization requirement. According to the“low fertilization response”and the maximum fertilization requirement, weeds were classified into three groups: Group I, Group II [Erigeron philadelphicus, Oxalis corniculata-type] and Group III [Digitaria sanguinalis, Poa annuatype] . From a comparison of the typical response curve of each group, it was indicated that lower fertilization might be of advantage to turfgrasses over weeds. Also, the T/R ratios of the turfgrasses were significantly larger than those of weeds under this condition. These indicate that a lower level of fertilization might be favorable for weed control management in warm-season turfgrasses.
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  • Effects of Light Irradiation and Cutting Height of Turfgrass on Expasion of the Turfgrass Large Patch Disease
    Fumiaki HAKUNO, Hitoshi KUNOH, Akira YAMADA, Fujio TSUBAKI
    2000 Volume 28 Issue 2 Pages 112-118
    Published: March 31, 2000
    Released on J-STAGE: June 08, 2010
    DOIhttps://doi.org/10.11275/turfgrass1972.28.112
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    Effects of light irradiation and cutting height of Zoysia grass on expansion of the turfgrass large patch disease were examined. In fairway of the golf course, a large patch area was divided to two sections. Turfgrass of one section was cut to approximately 18mm of height (high cutting section) and that of another section was done to approximately 8 mm (low cutting section) . Within two weeks of cutting, green turf recovred more prominently in the latter section than the former, although isolation rates of the pathogen were 70-80% in both sections. A similar experiment was done using Zoysia grass grown in a glass house by inoculation of the pathogen. The turf in 60cm× 60cm sections in a plant bed was cut to 25, 35 or 45mm of height. Light (about 1, 000 lux) was irradiated to one half of these sections for only 1 hr in the midnight, Four weeks later disease development was lowest in the irradiated, low cutting section. Scanning microscopy revealed that hyphae of the pathogen grew between sheaths and infection cushions formed on the surface of sheath.An earlier report showed that hyphal growth of the pathogen was remarkably suppressed by light irradiation due to the high sensitivity of the hyphae to low wave-length of light. All these observations suggest that sun light reaches the sheath areas of low-cut turfgrass easily and may suppress growth of hyphae and formation of infection cushions of the pathogen leading to suppression of disease expansion by low cutting of turfgrass in golf courses.
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  • A basic study for establishing wear tolerant turfs
    influences of turfgrass species, amendments, and SiO2 fertilizer
    Yoshito ASANO, Hyun-Jae RA, Bong-Ju PARK
    2000 Volume 28 Issue 2 Pages 119-126
    Published: March 31, 2000
    Released on J-STAGE: June 08, 2010
    DOIhttps://doi.org/10.11275/turfgrass1972.28.119
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    For establishing turfs in heavily used playgrounds, a basic experiment was conducted in which artificial trampling was applied over turfs, using 6 warm-season turf grasses, amendments and fertilizer. Appling 15 tramplings/day for a total of 6 months revealed that bermudagrass (Cynodon dactylon (L.) Pers, ) was the most tolerant (in the sense of the percent verdure remaining), followed by St. Augustinegrass (Stenotaphrum secundatum (Walt.) Kuntze) and Zoysiagrass (Zoysia japonica Steud.) . The more tolerant turfgrasses had heavier underground parts and less soil compaction occurred in their turfs, indicating that a cushioning effect against soil compaction of the developed underground part is attributed to the tolerance. Both topdressing crumb rubber and applying SiO2 fertilizer appeared to be effective to reduce the damage from trampling. It was suggested that the former increased the tolerance of turfgrass through the mechanical protection and also reducing soil compaction, and the latter through strengthening plant tissue.
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  • Classification and Control of Japanese Annual Bluegrass (Poa annua L.)
    Atsushi TATENO, Seiko IMAIZUMI, Takane FUJIMORI
    2000 Volume 28 Issue 2 Pages 127-137
    Published: March 31, 2000
    Released on J-STAGE: June 08, 2010
    DOIhttps://doi.org/10.11275/turfgrass1972.28.127
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  • [title in Japanese]
    [in Japanese]
    2000 Volume 28 Issue 2 Pages 142-145
    Published: March 31, 2000
    Released on J-STAGE: June 08, 2010
    DOIhttps://doi.org/10.11275/turfgrass1972.28.142
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  • ERRATUM
    2000 Volume 28 Issue 2 Pages 144a
    Published: 2000
    Released on J-STAGE: June 08, 2010
    DOIhttps://doi.org/10.11275/turfgrass1972.28.2_144a
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  • ERRATUM
    2000 Volume 28 Issue 2 Pages 144b
    Published: 2000
    Released on J-STAGE: June 08, 2010
    DOIhttps://doi.org/10.11275/turfgrass1972.28.2_144b
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  • ERRATUM
    2000 Volume 28 Issue 2 Pages 144c
    Published: 2000
    Released on J-STAGE: June 08, 2010
    DOIhttps://doi.org/10.11275/turfgrass1972.28.2_144c
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  • [title in Japanese]
    [in Japanese]
    2000 Volume 28 Issue 2 Pages 146-146_2
    Published: March 31, 2000
    Released on J-STAGE: June 08, 2010
    DOIhttps://doi.org/10.11275/turfgrass1972.28.146
    JOURNAL FREE ACCESS
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