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Direct planting (i.e. the planting of seed roots) can reduce the labor requirements of sweet potato ( Ipomoea batatas  (L.) Lam.) cultivation. To broaden the breeding material for high dry matter productivity in direct planting, root dry matter content (DMC) and root dry matter weight per hill (DMW) were compared under both direct planting and conventional transplanting by using 28 sweet potato genotypes cultivated in 2020 and 2021. Unlike in the case of the mother root DMC, a significant positive correlation between the daughter root DMC in direct planting and the root DMC in transplanting was observed over two years ( p  &lt; 0.001). Additionally, a significant positive correlation was observed between the total root DMW in direct planting and root DMW in transplanting ( p  &lt; 0.001). These results suggest that the dry matter productivity of genotypes in direct planting cultivation can be presumed from the performance of the transplanting cultivation.

Comparison of root dry matter content and root dry matter weight in sweet potato genotypes cultivated by transplanting and direct planting