Japanese Journal of Farm Work Research
Online ISSN : 1883-2261
Print ISSN : 0389-1763
ISSN-L : 0389-1763
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Volume 49, Issue 3
Displaying 1-11 of 11 articles from this issue
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Research paper
  • Influence of Black Locust Trees on Leaf Sheath Curvature in Welsh Onion Plant Plants and its Preventive Measures
    Kazuyoshi SATO, Yoshihiro KANETA
    2014 Volume 49 Issue 3 Pages 97-104
    Published: September 20, 2014
    Released on J-STAGE: March 20, 2015
    DOIhttps://doi.org/10.4035/jsfwr.49.97
    JOURNAL FREE ACCESS
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    Leaf sheath curvature in Welsh onions (Allium fistulosum) has become an issue in the sand dune fields adjacent to black locust (Robinia pseudoacacia) windbreaks in the Kawatogawa district of Noshiro City, Akita Prefecture, Japan. Therefore, we aimed to elucidate the relationship between leaf sheath curvature in Welsh onions and the black locust, and then examined preventive measures. The field experiment results revealed that the incidence rates of leaf sheath curvature in Welsh onions tended to increase the closer they were planted to the black locust trees. The incidence rates of curvature were particularly high for Welsh onions planted within 5 m of the black locust trees, and the degree of curvature in these Welsh onions was also greater. Accordingly, when Welsh onions were grown in a field where the black locust trees had been cut down as a method to counter leaf sheath curvature, the percentage of Welsh onions with curvature decreased. Next, we grew Welsh onions in a pot where the base of the plants was covered with flowers or leaves collected from the black locust in order to elucidate the effect of fallen matters from the black locust on curvature in Welsh onions. We discovered that curvature occurs only in the areas covered with flowers. On the basis of this finding, a covering material was introduced to prevent direct contact of the flowers with the base of Welsh onions. The result obtained using this covering material showed that the incidence rates of curvature were low and also that the degree of curvature was small. The abovementioned findings indicate that, as a measure to counter leaf sheath curvature in Welsh onions, it is imperative to grow the onions more than 5 m away from black locust trees or to develop a Welsh onion planting system that does not coincide with the season when black locust flowers begin to fall from the trees.
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