Genotype and harvesting age are found to be an important factor which affects the yield and yield components of sweet potato. Knowing harvesting age in sweet potato production is essential for above ground fresh biomass yield, vine length, leaf number, marketable tuberous root number per plant, marketable tuberous root weight per plant, marketable tuberous root yield per hectare, tuberous root length, tuberous root diameter and tuberous root dry matter content. It was found that the yield and yield components of sweet potato is highly related to the harvest stage. Based on reviewed information almost all the above parameters increased to some extent as harvest stage delayed. Sweet potato genotypes have different above ground biomass yield and tuberous root yield and differences in yield components among the studied genotypes of sweet potato could be attributed to genetic diversity. This review article can be used as a reference resource for researchers, students, agricultural extension workers and smallholders working in elsewhere on sweet potato production.
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