Research and development of corn variety, Suwan 5
1994
Chokechai Aekatasanawan | Sansern Jampatong | Chatpong Balla | Noppong Chulchoho (Kasetsart Univ., Bangkok (Thailand). National Corn and Sorghum Research Center)
Suwan 5 or Kasetsart Synthetic 5 (KS 5), the result of 10 years of high-yielding corn research and development by the KU Corn Breeding Project, was formed from 60 selected full-sib progenies (F.S.) of interpopulation crosses among four elite open-pollinated varieties (i.e., Suwan 1(S)C9, Caripeno DMR (S)C5, Thai Composite no.3 DMR (S)C5(M)C1, and Cupurico Flint Composite DMR (F)C4(S)C2 as well as ten selected F.S. of Amarillo Dentado (F)C5, in 1984 at Suwan Farm. Three cycles of S1 recurrent selection were used to improve Suwan 5. Results of trials in corn growing areas over eight years (1985-92) showed that Suwan 5 gave yields from 5,244 to 7,300 kg/ha; these were higher than Suwan 1 by 7 percent and Suwan 3 by 4 percent in 141 (8 yr.) and 125 (6 yr.) experiments, respectively. It had good agronomic traits and also gave high fresh and dry weights, making it suitable for use as forage. Kasetsart University and the Department of Agriculture certified Suwan 5 in 1993 and 1994, respectively, and it was released to farmers in 1993.
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