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Comparative performance of three small seed tuber sizes and standard size seed tubers planted at similar stem densities
Authors:S G Wiersema
Institution:(1) International Potato Center, Bangkhen, P.O. Box 9-159, 10900 Bangkok, Thailand
Abstract:Summary Small seed tubers of 1–5 g, 5–10 g and 10–20 g were planted at the same sprout densities as standard size seed tubers of 40–60 g in order to give similar stem densities. Early ground cover by foliage, total yield, and yield of tubers >45 mm were consistently greater in plots planted with larger seed tubers. The effect of seed tuber size on yield and tuber number per stem varied between years but 1–5 g seed tubers always gave lower yields per stem than larger seed tubers. Reducing the spacing between rows from 90 cm to 60 cm and maintaining the same sprout density was more effective in increasing yields from small seed tubers than increasing sprout density from 20 to 40 sprouts per m2 by reducing plant spacing within the row.
Keywords:Row spacing  sprout density  canopy cover  yield  tuber number  tuber size  clumping
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