Study on the yield of three varieties of sweet potato grown from hard, medium hard, soft stem cuttings and root sprout under eastern Samar [Philippine] conditions.
1987
Catayong R.C.
Variety 1 (VSP1) had the heaviest weight of marketable roots per hill and computed marketable root yield per hectare compared to variety 2 and 3. Variety 2 had the highest number of marketable roots, longest marketable roots, heaviest weight of vines and highest vine-root ratio compared to variety 1 and 3. Variety 3 had the longest number of days to maturity and biggest diameter of marketable roots. Differences among variety means were all significant in all parameters. Plants under soft stem cuttings had the highest number of marketable roots per hill, biggest diameter of marketable roots, longest length of marketable roots, heaviest weight of marketable roots and vines, highest vein-root ratio and had the highest computed marketable root yield per hectare compared to the other kinds and planting materials. Except for number of days to maturity and number of marketable roots per hill, treatment effect of all parameters were not statistically significant. Interaction effect between variety and kind of planting materials was observed only on the number of marketable roots per hill. Other parameters did not show interaction effect between variety and kind of planting materials. This study confirms earlier work that higher yield could be obtained from VSP-1 compared to VSP-2 and VSP-3. This study also confirmed an important observation that there is no difference in terms of yield of sweet potato when planted from hard, medium hard, soft stem cuttings and root sprouts. However, root sprouts show significant difference from vine cuttings in terms of days to maturity. Interaction effect was generally not observed except in terms of number of marketable roots per hill.
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