MAIZE (Zea mays L.) GENETIC ADVANCES THROUGH S1 RECURRENT SELECTION IN ETHIOPIA
Leta Tulu Bedada and Habte Jifar
Journal Title:Journal of Environmental Issues and Agriculture in Developing Countries
This paper presented the genetic gain and progress made in improving grain yield, plant height, ear placement, resistance to lodging and other desirable agronomic traits in Ukuruguru Composite B (UCB) maize variety through two cycles of selection. Three hundred and sixty and two hundred and fifty-four S1 families were evaluated in three environments and 36 and 25 families were selected following 10% selection intensity during the first (C1) and the second (C2) cycles, respectively. The progress made through selection was determined by evaluating the parent population (UCB C0), the first and the second selection cycles in six environments in a randomized complete block design with four replications. Commercial open pollinated and hybrid varieties were included as checks. UCB S1 C2 produced mean grain yield and had a significant genetic gain with mean gain. It was concluded that two cycles of S1 recurrent selection have brought significant genetic improvement in grain yield and major agronomic traits in UCB. Hence UCB S1C2 was fully released and recommended for commercial production in the mid altitude (1600-1800 masl) agro ecologies of Jimma and Illubabore zones, in South Western part of Ethiopia.