|Gibbons, J - UA RREC|
Submitted to: Rice Technical Working Group Meeting Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: February 27, 2000
Publication Date: N/A
Technical Abstract: In the southern U.S., more farmers are planting rice after harvesting wheat in order to have two crops per year. Late planting (a month later than usual) requires fast maturity and reasonable yield for both grain and milled rice. Forty-eight rice germplasm accessions collected from Japan, Korea and the U.S. were evaluated for earliness and yield of both grain and dmilled rice in 1997 and 1998 at Stuttgart, Arkansas. In 1999, the test was carried out in a farmer's field where wheat had recently been harvested. The three tests were designed as a split-plot (maturity group as the main plot) with four replications and planted in the middle of June each year. The results were analyzed with SAS. The cultivars "Bengal" and "Kaybonnet" took 75 and 77 days, respectively, from emergence to heading. However, the Japanese cultivars "Norin 20", "Tomokichiwase" and "Tomohikari" headed 40 days after emergence, which were the earliest heading cultivars in the test. The short life cycle of these cultivars might be useful for genetica and biological (pathology, entomology) studies in addition to earliness in the breeding programs. The Japanese medium grain cultivar "Jouiku 393" (57 days) and the Korean medium grain cultivar "Geumobyeo" (59 days) had the same heading date as the U.S. long grain line Farm Buster (58 days). Farm Buster had a yield of 3,100 kg/ha which was less than the yield of Jouiku 393 (4,500 kg/ha) and Geumobyeo (4,100 kg/ha). Jouiku 393 is a premium japonica rice cultivar that rated higher than Koshihikari, Bengal, and M- 201 in a taste test in Tokyo, Japan in 1996. Japan 92.09.31 was the highest yielding line (6,500 kg/ha) in the tests and its yield was greater than Bengal (5,500 kg/ha), "M-201" (5,200 kg/ha), Kaybonnet (4,900 kg/ha), and "Cypress" (4,700 kg/ha).