DOI: 10.15835/nsb13110691 Reduced water resources in sub-Saharan Africa will not only pose threat to the livelihood of poor resource farmers, but also food security in the region. Drought tolerant (DT) maize varieties hold promise to reducing poor resourced farmers’ vulnerability and improve food security in sub-Saharan Africa. Ten maize genotypes obtained from the International Institute of Tropical Agriculture (IITA), were evaluated in 2015 and 2016 using a randomized complete block design experiment with three replications to estimate their genetic variability and predict their genetic advances in the derived savannah agro-ecology. Growth, phenological and yield data were collected from 10 middle row plants. Genetic advance, genotypic, phenotypic and environmental coefficients of variations and their variances were estimated. Principal component and hierarchical cluster analyses were also performed. The dendrogram showed that at 80% dissimilarity point, the genotypes were grouped into clusters A, B and C in both years. The first two principal components explained 91.8% and 93.3% of the total variation in 2015 and 2016, respectively. Number of grains cob-1, plant height and number of days to physiological maturity were consistent in explaining the variations observed in the maize population. Heritability estimates in broad sense ranged from 1.35% for number of leaves to 87.43% for grain yield per hectare. The genetic parameters studied showed significant variations among the growth, phenological and yield data collected that warrants selection and maize improvement program using the DT maize inbred lines in derived savannah agro-ecology.
The main objectives of this investigation is to determine the GEl effects on grain yield of superior BILs derived from Swarna × WAB 450 inter cross and to select genotypes that are widely adapted across upland rice growing rainfed areas in North Karnataka, India. Multi-location yield trials of nineteen superior BILs (BC1F8) and three checks selected for earliness, productivity, reaction to blast diseases and grain size were conducted at three locations in six environments. Result of Additive Main effect and multiplicative interaction (AMMI) analysis showed that genotypes, environments and GEI components were significant. Out of twenty two genotypes evaluated for GEI effect in this study, six genotypes were found suitable for all environments; six genotypes for favourable environments while ten genotypes were identified as suitable for unfavorable environments.
This study focused on evaluation of introgressed population for earliness in flowering and productivity under rainfed upland rice ecosystem. The population was derived from inter-varietal cross between early maturing Africa upland land rice WAB-450, an inter-specific derivative as donor and Swarna, a mega rice variety from India, as recurrent parent. One hundred and eighty eight ( 188) backcross inbred lines (BILs) with the two parents were evaluated during kharif 2011 at Mugad Agricultural Research Station (ARS), University of Agricultural Sciences Dharwad. The BILs showed significant improvement over Swarna for earliness in flowering and productivity under natural rainfed condition. The frequency distribution of days to 50% flowering observed in this study showed continuous variation. The distribution was normal indicating inheritance of a quantitative trait and influence of WAB-450 genome contribution in one backcross in the expression of this trait. The BILs which flower between 90 and 100 days and mature around 120 to 135 days with high yield coupled with other desired traits such as grain quality have been identified for upland rice ecosystem.
To obtain the mechanical properties of plywood produced from six yearold hybrid Eucalyptus in Ghana was the objective of this research. The samples for the experiment were prepared and tested according to GS EN 326-1, GS EN 310, GS EN 314-1, and GS EN 314 -2. The data obtained were analysed using the factorial ANOVA analysis. The mean results obtained for the various treatments were MOE (6520 – 7638 N/mm2), MOR (53.29 – 60.56 N/mm2, shear strength (2.47 – 5.51 N/mm2), failure (72 -90%) and density (725 – 748 kg/m3). The orientation of the surface veneer caused variations among treatments whiles the adhesives PF and MUF largely did not cause any variations among treatments. This study has proven that it is possible to produce sufficiently strong and resistant plywood from the juvenile wood of eucalyptus.
A major constraint to sweetpotato production in Nigeria is the lack of clean and sufficient quantities of vine cutting at the time of planting in May or June. Inorder to obtain planting materials, farmers subject sweetpotato to vine harvest at various times but there is dearth of information on the effect of the level or intensity of defoliation on the crop. In this study, the response of three orange-fleshed sweetpotato varieties to cutting regimes in 2014 and 2015 cropping seasons in a tropical ultisol of South eastern Nigeria was evaluated. In each year, the experiment was laid out as 3 x 4 factorial arranged in randomized complete block design with three replications. Treatments comprised all combinations of three orange-fleshed sweetpotato varieties (Umuspo 1, Umuspo 3 and Ex-Igbariam) and four cutting regimes (6, 10 and 14 weeks after planting [WAP], 8 and 12 WAP, 10 and 14 WAP and no-cutting). Cutting regimes did not influence fresh shoot biomass in both year but cutting at 10 and 14 WAP significantly increased multiplication ratio compared to no-cutting or other cutting schedules. Storage root yield was, however, significantly higher with no-cutting than with the 4 weekly cuts, regardless of cutting dates. In all situations, Umuspo 1 produced significantly higher multiplication ratio and higher top and storage root yields than other varieties. Conversely, Umuspo 3 produced higher carotene yield at 10 and 14 WAP cutting compared to other varieties and cutting regimes.
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