• Title/Summary/Keyword: Sowing Date

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Agronomic Characteristics as Affected by Polyethlene Film Mulching and Sowing Date in Vegetable Perilla (잎들깨 멀칭재배 및 파종기에 따른 생육특성)

  • 김동관;정찬식;천상욱;국용인;김명석;방극필
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.49 no.3
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    • pp.184-187
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    • 2004

  • In case of a semi-forcing culture for vegetable perilla, the following research results on the effect of black polyethylene mulching, the optimum sowing season, and the seedling stand improvement method were drawn. Soil temperature was higher and the emergence was faster in a black polyethylene mulching culture than in a non-mulching culture. However, the mature was late, the main stem were larger, and the seed yield, as well as the leaf yield, was greater in a mulching culture than in a non-mulching culture. Considering growth and chilling injury, the stable sowing season of vegetable perilla was judged to be the early in January. The covering materials for improvement of the seedling stand can be a non-woven fabric and hyaline polyethylene. However, the non-woven fabric seemed to be quite suitable in view of the stability and convenience of control after the emergence of perilla.

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Assessing the potential invasiveness of transgenic plants in South Korea: a three-year case study on sunflowers

  • Han, Sung Min;Nam, Kyong-Hee
    • Journal of Ecology and Environment
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    • v.46 no.3
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    • pp.190-201
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    • 2022

  • Background: The introduction of new living modified (LM) crops may pose a latent threat to the biodiversity of each country. Here, we used sunflowers (Helianthus annuus L.) as a study system to investigate the potential for invasiveness of LM crops under different environmental conditions when released into a natural ecosystem in South Korea. We examined the seed germination, survival, and flowering of sunflowers under competition with wild plants at different sowing dates (March-December) and plot sizes (1 m × 1 m and 2 m × 2 m). Results: The germination rate showed a significant difference according to the sowing date. In addition, several sunflowers survived in plots with a high germination rate, which also led to a higher flowering rate. We found that the smaller the plot, the smaller the area available for inter-species competition, and the higher the number of surviving sunflower plants. The relative dominance and importance value of the species varied significantly between the sowing dates; in particular, sunflowers sown in March could compete with wild plants for longer than those sown on other sowing dates. Conclusions: These observations indicate that the potential for invasiveness of sunflowers differs depending on the environmental conditions and seed density at the time of release.

  • https://doi.org/10.5141/jee.22.039 인용 PDF KSCI