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  • 1
    Electronic Resource
    Electronic Resource
    Effects of weight and planting density of tubers derived from true potato seed on growth and yi ld of potato crops in Egypt. 2. Tuber yield and tuber size
    Amsterdam : Elsevier
    Field Crops Research 35 (1993), S. 171-182 
    Details
    ISSN: 0378-4290
    Keywords: Environmental factors ; Management practice ; Potato ; Solanum ; Yield
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0378-4290(93)90151-C
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Potato production from true potato seed (TPS) in Egypt: Effect of the growing season on seedling development, recovery from transplanting and yield (1994)
    Springer
    Potato research 37 (1994), S. 233-243 
    Details
    ISSN: 1871-4528
    Keywords: physiological ageing ; premature tuberization ; Solanum tuberosum L. ; transplanting shock
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Ware potatoes were produced from true potato seed by transplanting seedlings to the field in different growing periods to evaluate environmental constraints of this production method in the Nile delta. In the autumn season, with high temperatures and long-day conditions during seedling culture in the nursery and transplant establishment in the field, seedling development was fast, and transplants resumed growth within 5 days of transplanting in the field. Tuber yields ranged between 120 and 160 dt ha−1. In the spring season, with low temperatures and short-day conditions during the initial growing phase, seedling development in the nursery was slow and biomass partitioning between above ground organs (stems, leaves) and tubers was shifted towards the tubers. This partitioning was further enhanced by transplanting the seedlings in the field. Seedlings recovered only slowly from transplanting or died. It is concluded that potato production via transplants is poor in the spring season when premature tuberization of seedlings in the nursery leads to slow field establishment and low tuber yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360515
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  • 3
    Electronic Resource
    Electronic Resource
    Seed tuber production from true potato seed (TPS) in Egypt and the influence of environmental conditions in different growing periods (1993)
    Springer
    Potato research 36 (1993), S. 195-203 
    Details
    ISSN: 1871-4528
    Keywords: seedbed ; tuber initiation ; ground cover ; tuber size distribution ; Solanum tuberosum L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360528
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  • 4
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    Effect of the developmental stage of potato seedlings on recovery after transplanting to the field and on tuber yield (1995)
    Cambridge University Press
    Details
    Publication Date: 1995-04-01
    Description: SUMMARYUnder the short-day conditions and cool temperatures prevailing from January to March in the Nile delta, Egypt, potato (Solatium tuberosum) seedlings grown from true potato seed formed tubers in the nursery when the plants were less than 5 cm in height. In order to examine the hypothesis that slow field establishment after transplanting and low tuber yields of these seedlings were caused by premature tuberization, different treatments to delay tuberization were applied in the nursery before transplanting.Increasing the air and soil temperature in the nursery accelerated both the development of the above-ground and below-ground shoot organs, but did not improve field establishment of the seedlings after transplanting. Extension of the photoperiod with incandescent dim light, exogenous application of gibberellic acid (GA), and removal of the shoot apex to encourage the growth of lateral branches from the leaf buds increased biomass allocation to the above-ground shoot organs, decreased tuberization in the nursery and accelerated field establishment of transplanted seedlings. Extension of the photoperiod was the most effective treatment to delay tuberization, and doubled the final tuber yield from transplanted seedlings.The results are in agreement with the hypothesis that poor field establishment and low final tuber yields from potato transplants may be caused by the presence of strong tuber sinks at transplanting, which reduce assimilate partitioning towards the roots and above-ground shoots.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Cambridge University Press
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