Study on the Optimal Seeding Date of Rice Direct Hill-Seeding on Puddled Paddy in Honam Plain Area
2012
Choi, M.K., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Ku, B.I., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Kang, S.G., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Sang, W.G., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Back, N.H., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Kim, Y.D., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Park, H.K., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Choi, W.Y., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Park, T.S., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Kim, B.K., National Institute of Crop Science, RDA, Iksan, Republic of Korea
To recommend optimal rice seeding date for direct hill seeding on puddled paddy surface in Honam plain area, Hopumbyeo (Oryza sativa L.) was seeded 6 times by 10-day interval from April 30 to June 19 in 2009 and 2010. Seedling stand was the highest in two seeding dates, May 20 and May 30, and other seeding dates showed acceptable seedling stand except April 30. Tiller numbers at panicle formation stage were increased up to May 30 and decreased thereafter. Heading date of the seeding on May 20 and May 30 were August 19 and August 23, respectively, and the seeding on June 19 was August 31. In 2009, panicle numbers per ㎡ was the highest in the seeding on May 20 and decreased in the later seeding dates. However, the seeding on June 19 showed the highest panicle number and the others were not significantly different in 2010. Number of grains per panicle was the highest in the first planting date and was decreasing as seeded later. Milled rice yield was the largest in the seeding date of May 20 in 2009, and in the seedling date of May 30 in 2010. The head rice ratio was increased up to May 20 and similar in the later seeding dates. Protein content was lower in earlier seeding dates. According to the above results, the optimal seeding date of direct hill seeding on puddled paddy in Honam plain area was considered to be May 30. The last seeding date related to the limit date of safe heading was June 19.
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