PN06 - Strategic Innovations in Dryland Farming
Permanent URI for this collectionhttps://hdl.handle.net/10568/17007
Browse
Recent Submissions
Item Empowering farming communities in Northern Ghana with strategic innovations and productive resources in dryland farming: Technical Progress Report of Project 6 of the Challenge Program on Water and Food, 2004-2005(Report, 2012-08-23) Asante, Stephen K.; Padi, Francis KItem Response to selection for grain yield and correlated response for grain size and earliness in cowpea based on early generation testing(Journal Article, 2008-06) Padi, Francis KLarge grain size and earliness to flowering are traits critical to cowpea adoption in the West African savannahs. This study reports on the correlated response to selection in these two traits in the two populations in which selections were made primarily for grain yield potential. Further, the present study reports on the effectiveness of early generation selection for grain yield. Each of the two populations, SARC 2 and SARC 3, was derived from a cross between an adapted parent Marfo‐Tuya and an exotic breeding line that has large grain size and early flowering. Replicated yield evaluation of F5 families showed that grain yield of Marfo‐Tuya was not different from those of the highest yielding families in each population. Increases in grain size of individual families over Marfo‐Tuya were large and, the response to selection averaged 5.3 and 3.9 g/100 seeds in the SARC 2 and SARC 3 populations, respectively. Response to selection in days to flowering averaged 3 days in SARC 3, whereas response to selection was not observed in SARC 2. Retrospective selection in the F3 at 40% intensity was efficient in identifying a high proportion of elite families in each population.Item Early generation selection for high yielding cowpea genotypes in additive series intercropping systems with sorghum(Journal Article, 2007) Padi, Francis KItem Effectiveness of early generation selection in cowpea for grain yield and agronomic characteristics in semiarid West Africa(Journal Article, 2008-03) Padi, Francis K; Ehlers, J.D.The effectiveness of early generation selection for grain yield in a cowpea [Vigna unguiculata (L.) Walp.] population was examined in the Guinea and Sudan savanna agroecologies of Ghana where genotype × location interaction is known to be large. A set of 131 F3:4 lines were developed from a cross between a local cultivar and an unadapted source of large grain size. Mild selection was practiced during line development at one location in the Guinea savanna zone to eliminate poorly adapted lines. Unreplicated F3 plant data were collected on all the lines at the one location during the development of the lines. Multilocation trials were conducted with lines formed by bulk harvest of F4 families to assess how effectively the early generation selection protocol was able to generate superior lines for the target agroecology. Genotypic correlation for grain yield between locations was high only between the two locations in the Guinea savanna zone. Narrow‐sense heritability estimates were low and not different from zero for grain yield, but heritability estimates for days to flowering and seed size were large. F4 lines derived from the highest 10% performing F3 individuals were no higher yielding than F4 lines derived from the remaining F3 individuals, indicating that early generation selection for yield was ineffective. Single‐seed descent (SSD) or bulk breeding methods will be more efficient than pedigree breeding for developing cowpea varieties with high yield potential for this agroecology.Item Empowering farming communities in Northern Ghana with strategic innovations and productive resources in dryland farming(Report, 2011-04-18) Asante, Stephen K.