Growth and Yield Influenced by Seeding date in Rice Wet Hill Direct Seeding in Honam Double Cropping Area
2014
Kang, S.G., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Choi, M.K., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Ku, B.I., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Sang, W.G., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Lee, M.H., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Kim, Y.D., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Park, W.Y., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Kim, B.K., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Lee, J.H., National Institute of Crop Science, RDA, Jeonju, Republic of Korea
Field experiments were conducted to identify the safe seeding date for rice wet hill direct seeding on puddled paddy surface after barley or wheat cultivation in Honam plain area. Two Korean bred-cultivars, Unkwangbyeo (early maturing) and Dongjin2 (mid-late maturing), were seeded 4 times by 10-day interval from May 25 to June 25 in 2012 and 2013. Seedling stand decreased as seeded later, but it was in optimal range in all the seeding dates. Heading date of the last seeding of Unkwangbyeo on June 25 was August 28, and the last seeding of Dongjing2 on June 25 was September 2, which was within the limit date of heading (September 3). Panicle numbers per m2 were not significantly different until the third seeding on June 15, but it decreased in the seeding date on June 25. Number of grains per panicle decreased as seeded later. Milled rice yield and head rice ratio was also decreased as seeded later, and were the lowest in the last seeding date on June 25. Protein content of Unkwangbyeo was similar regardless of seeding dates, but it increased at later seeding dates in Dongjin2. According to the above results, the seeding date would be recommended within June 25 for Unkwangbyeo, June 15 for Dongjin2 in wet hill direct seeding on puddled paddy in Honam double cropping area.
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