Breeding & genetics for the improvement of yield & quality of corn

Activities on R & D of the Corn Breeding Project in 1995 were as follows: 1. Yield trials on new lines in early rainy season with Suwan 3701 as a check hybrid 1.1 Lines extracted from SW 3(S)C5 top crossed with Ki 42 produced yield 1,479 kg/rai that higher than the check 22 percent 1.2 Lines derived from RS1-KU1 with Ki 44 as a tester gave yield 1,378 kg/rai that higher than the check 10 percent 1.3 Sichuan lines tested with Ki 44 yielded 1,355 kg/rai that higher than the check 16 percent 1.4 Lines developed from private sectors tested with Ki44 produced yield 1,139-1,365 kg/rai that higher than the check 6-17 percent 2. Yield trials on new lines in late rainy season 2.1 Lines of Pop 31-C4-S5 and Pop 100 (LW-DMR)-C4-S5 top crossed with SW 3701 produced yield 859 kg/rai that higher than the check 18 percent 2.2 S2 and S3 lines that developed from the cooperation in Vietnan with tester Ki 32 gave maximum yield 882 kg/rai (22 percent higher than the check) and with tester Ki 44 produced yield 855 kg/rai (76 percent higher than the check SW3701). 2.3 Lines extracted from Chumphon Project with Ki 32 tester gave yield 684 kg/rai or 20 percent higher than the check 2.4 Lines extracted from TAMNET and top crossed with Ki32 and Ki44 indicated that there were 40 lines produced yield 600-900 kg/rai that more than the check 7-64 percent. 2.5 Alexander high oil (AHO) lines top crossed with KOSX 3501 produced maximum yield 723 kg/rai that higher than the high oil check 4 percent. 2.6 DA-HO lines top crossed with KOSX 3501 gave maximum yield 739 kg/rai that more than the check 10 percent. 2.7 Illinois high oil (IHO) lines top crossed with KOSX 3501 produced maximum yield 791 kg/rai but there were some variation. 3. Yield trials on Paddy soil. Three trials were conducted at Chainat. There were 10 varieties produced average yield range 660-721 kg/rai or 4-14 percent higher than the check (Suwan 3101). And at Ubon Ratchatani the maximum yield was 777 kg/rai that higher than the check 6 percent. 4. Tropical Asian Maize Network, TAMNET, Trials. There were eight countries that contributed 19 hybrids to participate testing at 21 locations in 11 countries. From the statistical analysis revealed that the top five hybrids were from the KU Corn Breeding Project namely KTX 3503, Suwan 3702 (KTX 3501), Suwan 3701 (KOSX 3503), KDX 3701 and KDX 3702. Their mean yields were 6,698, 6,229, 6,109, 6,093 and 6,045 kg/ha, respectively. 5. International Training. The Project organized baby corn training for 15 nations. 6. Germplasm distribution. The Project contributed germplasm to both public and private sector according to the rules and regulations of the university.