Waxy corn hybrids yield trial of preliminary single cross by testcross method

Abstract

The objective of this research was to develop high yields and good consumption quality of waxy corn. Twenty lines were selected and were then fertilized crosses between line and three testers including UPT1 UPT2 and UPT7. A total of 60 preliminary single hybrids were obtained. Planting yield trial evaluation comparative with commercials 4 varieties. The experiment was randomized complete block design with two replications. The result showed that tasseling and silking ranged from 44 – 51 days and 45 – 51 days respectively. The best average green weight was UPWX2207 and UPWX2447, equal to 2,743 kg/rai. The best average white weight was UPWX2447, equal to 1,943 kg/rai. The UPWX2447 showed good eating quality with a score of 3.0, whereas UPWX2377 and UPWX2423 gave the highest cutting of 71.4%. The average ear length, ear width and tip fill were 15.6, 3.7 and 13.3 cm, respectively. In addition, the foliar diseases evaluation Downy Mildew, Northern Corn Leaf Blight, Southern Corn Leaf Blight, Corn Rust, results showed that all crossed-hybrids had foliar disease incidence at a good-very good level, with the scores of 1.0, 1.0, 1.5 and 1.4 points, respectively. Most importantly, UP233 lines that had general combining ability in green weight and white weight will be developed a potential inbred for producing hybrid. For specific combining ability, UPWX2207 and UPWX2447 had a potential for hybrid due to high mean and specific combining ability of green weight.