Response of potato (Solanum tuberosum) tuber yield components to gel-polymer soil amendments and irrigation regimes

dc.contributor.authorEiasu, B.K. (Bahlebi Kibreab)
dc.contributor.authorSoundy, Puffy
dc.contributor.authorHammes, Pieter Snyman, 1941-
dc.contributor.emailbkef68@yahoo.comen
dc.date.accessioned2008-05-22T12:31:16Z
dc.date.available2008-05-22T12:31:16Z
dc.date.issued2007
dc.description.abstractTwo field experiments were conducted to investigate the effects of two gel-polymer formulations (pure and fertiliser-fused) and moisture stress on yield and quality of potato (Solanum tuberosum). The experiments were carried out at the Hatfield Experimental Farm of the University of Pretoria, South Africa. Six gel-polymer rates, consisting of pure gel polymer at 1.5 kg/m3 of soil, with 85% and 70% fertiliser rate of the control, and fertiliser-fused gel polymer at 1.5, 2, and 3 kg/m3 soil, and control (without gel polymer) were assigned to the subplots. Four maximum allowable moisture depletion (MAD) levels, 25%, 40%, 55%, and 70% of the plant available soil moisture, were allocated to the main plots. Rate of phosphorus (P) was the same for all treatments (168 kg/ha). Total nitrogen (N) and potassium (K) budget for the treatments (except one pure gel-polymer treatment received 85%) were balanced to 70% of the control. The fertiliser-fused gel polymer showed no substantial improvement in tuber yield parameters for all rates. The pure gel polymer, especially at higher fertiliser rate, improved total and marketable tuber yield. Marketable tuber number and yield, and total tuber mass showed declining trend with an increase in MAD. Significant reduction in tuber fresh and dry mass was observed at the 55% and 70% MAD irrigation levels. Both high and low soil moisture levels reduced tuber specific gravity. Incidence of common scab was inversely related to the irrigation frequency.en
dc.format.extent292873 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.citationEiasu, BK, Soundy, P & Hammes PS 2007, ' Response of potato (Solanum tuberosum) tuber yield components to gel-polymer soil amendments and irrigation regimes', New Zealand Journal of Crop and Horticultural Science, vol. 35, no. 1, pp. 25-31 [http://www.rsnz.org/publish/nzjchs/]en
dc.identifier.issn0114-0671
dc.identifier.urihttp://hdl.handle.net/2263/5457
dc.language.isoenen
dc.publisherRoyal Society of New Zealanden
dc.rightsRoyal Society of New Zealand. This article is embargoed by the publisher until March 2009en
dc.subjectCommon scaben
dc.subjectGel polymersen
dc.subjectMaximum allowable moisture depletionen
dc.subjectPotato tuber specific gravityen
dc.subject.lcshPotatoes -- Breedingen
dc.subject.lcshSoil amendmentsen
dc.subject.lcshIrrigation -- Managementen
dc.titleResponse of potato (Solanum tuberosum) tuber yield components to gel-polymer soil amendments and irrigation regimesen
dc.typePostprint Articleen

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