• Title/Summary/Keyword: planting date

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An Optimum Seed Planting Time of Chinese Milk Vetch (Astragalus sinicus L.) for Stable Seedling Establishment and Dry Matter Production in Paddy Field (벼 낙수시기 기준 자운영 파종적기 구명)

  • Kim, Sang-Yeol;Oh, Seong-Hwan;Choi, Kyung-Jin;Kim, Jeong-Il;Park, Sung-Tae;Yeo, Un-Sang;Kang, Hang-Won
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.54 no.3
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    • pp.260-264
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    • 2009

  • Sufficient seedling establishment of Chinese milk vetch (CMV) is the most important factor in the CMV cultivation. In order to obtain sufficient seedling stand, CMV seed should be planted at right seed planting date. An optimum CMV seed planting time for stable seedling establishment was determined based on the final water drainage time for rice harvest in fall. Five planting times from 10 days before water drainage (DBWD) to 15 days after water drainage (DAWD) at five day interval were evaluated during the period of 2006-2007 and 2007-2008 and the optimum CMV seed planting time was determined based on seedling stand, winter survival rate, and dry matter production. CMV seedling stand before winter was high with $575{\sim}1,050\;plants/m^2$ regardless of seed planting times but after overwintering, it was greater in seed planting date between 5 DBWD to 5 DAWD than that of 10 to 15 DAWD treatments. Winter survival rate, dry matter production and seed production yield also showed similar trend to the seedling establishment. On the other hand, when CMV seeds were sowed early at 10 DBWD, seedling stand and winter survival rate were lower than that of 5 DBWD to 5 DAWD. This result indicates that an optimum CMV seed planting time based on the final water drainage could be between 5 DBWD (September 20) to 5 DAWD (September 30).

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Effect of Planting Date on the Infection of Necrotic Soybean SMV (파종시기에 따른 콩 양저바이러스(SMV-IV)의 발생경향)

  • 신두철;김순권;황영현;박근용;김호일
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.24 no.3
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    • pp.59-65
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    • 1979

  • Severe outbreak of necrotic. soybean mosaic virus. (SMV -N) strain has been observed on soybean (Glycine max) in the central northern pans of Korea. Thirty soybean cultivars developed from Korea. Japan, and USA were tested for the estimation of infection percentages and ratings at 4 different planting dates. SMV-N infection was decreased by delaying the planting dates, but no differences were observed in conmon mosaic virus. Most of the soybean cultivars developed in Korea, and Japan were more susceptible to SMV- N than the US developed cultivars. Infection ratings of SMV-N showed highly significant negative correlations with common SMV regardless of planting dates.

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Effect of Transplanting Dates and Density on Dry Root Yield in Alisma plantago Cultivated after Early Maturing Rice Cropping

  • Kwon, Byung-Sun;Park, Hee-Jin;Shin, Jong-Sub;Lee, Sang-Rae
    • Plant Resources
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    • v.3 no.3
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    • pp.194-199
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    • 2000

  • The result of this experiment which are conducted, to improve the cultivation technology of Alisma plantago, to increase its quantity and to contribute for stable production with Yongiun local group by examining the optimal planting density and transplanting period of double cropping of Alisma plantago in the southern region. The characters of plant height, leaf width and length tend to be reduced as the seeding period is later by the order of the 10th, 20th and 30th of July. The period required for flowering is reduced as the transplanting period is later and dense planting is applied. Plant height, the number of leaves and yield of dry root have much quantity at the dense planting density of 20$\times$ 15cm as they are transplanted later in the 30th of August or the 10th of September, but they are rather less in sparse planting density of 20$\times$25cm or 20$\times$35cm.

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