Genotype x environment interaction of soybean [glycine max (l.) merrill] for grain yield and nutritional quality in the Eastern Zone of Tanzania.

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dc.contributor.authorRashid, Mussa
dc.date.accessioned2025-02-06T09:49:53Z
dc.date.available2025-02-06T09:49:53Z
dc.date.issued2014
dc.descriptionA dissertation submitted in partial fulfilment of the requirements for the degree of master of science in crop science
dc.description.abstractA study on genotype x environment interaction (GEI) of soybean [Glycine max (L.) Merrill] genotypes was conducted for grain yield, yield related traits, protein and oil contents at three locations during 2013 cropping seasons. The study aimed at determining the magnitude of GEI on soybean genotypes and identify widely and /or specifically adapted genotypes in the Eastern Zone of Tanzania. Six genotypes were evaluated at three locations in a rondomized complete block design in split- plot arrangements. Environment had strong significant (P < 0.001) differences for all evaluated variables except for crude protein and oil content. Similarly genotypes had significant (P < 0.05) differences for all evaluated variables. Oil was not affected by the interaction between genotype and environment. Genotypes TGX 1954-1F and TGX 1908-8F displayed higher yields at Ilonga. TGX 1954-IF at Kibaha and TGX 1908-8F at Mlingano. The best genotypes for seed yield across the environments were TGX 1954-IF and TGX 1908-8F. On the other hand, TGX 1987-29F had the highest protein content while Bossier had highest oil content within and across the environments. High heritability was recorded for pod length, 100-seed weight, initial plants at germination per plot, grain yield and plant height. High heritability coupled with high genetic advance was recorded for seed yield. Combined data over locations indicated that grain yield was positive and highly significant correlated with number of seeds per plant (r= 0.6119 ) and plant height (r= 0.5626 ). Path coefficient analysis indicated that the highest genotypic positive direct effect on grain yield were recorded in number of seeds per plant (0.545) and plant height (0.315). The highest positive and significant indirect genotypic effects on grain yield were recorded on plant height through number of seeds per plant (0.282) followed by number of pods per plant through number seeds per plant (0.271).
dc.description.sponsorshipThe Commission for Science and Technology (COSTECH)
dc.identifier.urihttps://www.suaire.sua.ac.tz/handle/123456789/6529
dc.language.isoen
dc.publisherSokoine University of Agriculture
dc.subjectGenotype x environment interaction
dc.subjectSoybean
dc.subjectglycine max (l.)
dc.subjectGrain yield
dc.subjectNutritional quality
dc.subjectEastern Zone-Tanzania.
dc.titleGenotype x environment interaction of soybean [glycine max (l.) merrill] for grain yield and nutritional quality in the Eastern Zone of Tanzania.
dc.typeThesis

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