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: Effect of seed tuber size and planting space on tuber yield and tuber size of potato (S.tuberosum) was studied in red-yellow latosols of dry zone under irrigation. It was found that the number of stems and tubers produced per plant significantly increased with increasing seed tuber size and planting space. The numbers of stems and tubers per plant were significantly associated. Narrow spacing increased the yield per hectare but decreased the yield per plant: Production of large size tubers were not influenced by the size of seed tubers planted. However increasing planting space increased the production of large size tubers. Because of the high seed cost, income may be optimized if the seed tubers are sorted according to size and planted in 6Ox20cm, 6Ox30cm, and 6Ox50cm spacings respectively.

journal of the national science foundation of sri lanka/journal of the national science foundation

EFFECT OF SEED TUBER SIZE AND PLANTING SPACE ON GROWTH, YIELD AND TUBER SIZE DISTRIBUTION OF POTATO (SOLANUM TUBEROSUM) IN IRRIGATED RED-YELLOW LATOSOLS OF THE DRY ZONE