Effect of genotype x environment interactions on yield and grain qualities of rice (oryza sativa, L.) in Morogoro region

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dc.contributor.authorKibanda, Nkori john Maregesi
dc.date.accessioned2026-03-19T07:23:58Z
dc.date.available2026-03-19T07:23:58Z
dc.date.issued2001
dc.descriptionDissertation
dc.description.abstractThree experiments were conducted in the 1999/2000 season at Lumemo (rainfed lowland), Tanganyika Agricultural Cooperation (TAC) (irrigated) and Sokoine University of Agriculture (SUA) Farm (upland). The aim of the study was to determine the relative contributions of the newly obtained genotypes, environments and their interaction to the variations of grain yield, yield components and grain quality characteristics. Ten genotypes obtained from SUA and Kilombero Agricultural Training and Research Institute (KATRIN) were used in the experiments which were laid down in a Randomized Complete Block Design (RCBD) with three replications. The plot size was 4m x2m in which the plants were spaced at 20cm x 20cm. Data collected included the agronomic and grain quality characteristics, which were subjected to the analysis of variance, Correlation, Path coefficient and Stability analyses. The analysis of variance revealed that there were significant variations in the genotypes tested for most of the traits tested. Although there was significant genotype x environment interactions for most of the traits tested, early maturing lines SSD1, SSD3 and SSD5 performed better in all three environments. However, the late maturing genotypes performed better under supplementary irrigation at TAC. The results from correlation and path coefficient analyses revealed that the number of panicles/plant and percent spikelet fertility could be important characters that influence grain yield. Since these two characters also showed high heritability estimates, they could be used as indirect selection criteria for grain yield during early generations of rice breeding. Similarly for grain quality, estimates of heritability and genetic advance were high for gel consistency. From the results of this study, it can be provisionally concluded that early maturing genotypes may be grown in all three ecosystems in Morogoro region, while the late maturing genotypes are suitable in irrigated conditions or under rainfed with supplemental irrigation. Based on the overall performance and grain quality analysis, lines SSD1, SSD3 and SSD5 can be recommended for further evaluation in farmers fields.
dc.description.sponsorshipTARP II of the Ministry of Agriculture and Food Security
dc.identifier.urihttps://www.suaire.sua.ac.tz/handle/20.500.14820/7433
dc.language.isoen
dc.publisherSokoine University of Agriculture
dc.subjectGrain yield
dc.subjectGrain quality
dc.subjectYield components
dc.subjectRice
dc.subjectGenotype X
dc.subjectEnvironment interactions
dc.titleEffect of genotype x environment interactions on yield and grain qualities of rice (oryza sativa, L.) in Morogoro region
dc.typeThesis

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