Seed tuber production from true potato seed (TPS) in Egypt and the influence of environmental conditions in different growing periods |
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Authors: | C. Engels R. El Bedewy B. Sattelmacher |
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Affiliation: | (1) Institute of Plant Nutrition, University Hohenheim, 70593 Stuttgart, Germany;(2) CIP Region IV Office, P.O.B. 17, Kafr El Zayat, Egypt;(3) Institute of Plant Nutrition and Soil Science, University Kiel, Olshausenstrasse 40, 24118 Kiel 11, Germany |
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Abstract: | Summary The effect of environmental conditions on seed tuber production from true potato seed (TPS) in nurseries was evaluated in different growing periods during two seasons in Egypt. In the autumn season, high soil and air temperatures reduced emergence and initial foliage development of early-sown seedlings, and decreased tuber yields. In late-sown seedlings low night temperatures and short daylengths caused early tuberization, poor foliage development and low tuber yields. In the spring season, low temperatures and short daylengths resulted in a slow initial foliage development and early haulm-tuber competition for assimilates in early-sown seedlings. However, tuber yields were higher than for late-sown seedlings, presumably because net assimilation and assimilate partitioning to the tubers were impaired by above optimum air and soil temperatures in May and June. Slow development of true seed-sown plants caused a high sensitivity towards adverse environmental conditions and would limit yielding ability in Egypt. |
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Keywords: | seedbed tuber initiation ground cover tuber size distribution Solanum tuberosum L |
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