A method of increasing yield, biomass, growth rate, vigor, oil content, fiber yield, fiber quality, abiotic stress tolerance, nitrogen use efficiency and/or reducing time to flowering of a plant as compared to a wild type plant of the same species which is grown under the same growth conditions, comprising over-expressing within the plant a polypeptide comprising an amino acid sequence as set forth by SEQ ID NO:
- 799, 488-500, 502-520, 522-620, 622-783, 785-798, 800-813, 4852-4937, 4943-5453, 5460, 5461, 5484, 5486-5550, 5553, 5558-5899, 5902-7842, 7848-8090 or 8091, or a homologous polypeptide thereof which exhibits at least 80% sequence identity to said amino acid sequence, wherein said homologous polypeptide increases yield, biomass, growth rate, vigor, oil content, fiber yield, fiber quality, abiotic stress tolerance, nitrogen use efficiency and/or reduces time to flowering of a plant, thereby increasing the yield, biomass, growth rate, vigor, oil content, fiber yield, fiber quality, abiotic stress tolerance, nitrogen use efficiency and/or reducing time to flowering of the plant.