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Phosphorus application strategies in potato

constraints and potential improvements

Ekelöf, Joakim (2014). Phosphorus application strategies in potato. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2014:61
ISBN 978-91-576-8070-9
eISBN 978-91-576-8071-6
[Doctoral thesis]

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Abstract

Phosphorus (P) is an essential element that plays an important role in carbohydrate metabolism and energy transfer systems in all plants. Sufficient P supply is therefore essential for providing adequate food, fibre and fuel for society. In potato, P deficiency reduces yield and tuber number due to reduced radiation interception by the canopy.

Phosphorus is a limited, non-renewable resource. When lost to water bodies, P causes environmental problems such as eutrophication. Potato fields may be a significant contributor to P loads to water due to high P recommendations and a tendency for P leaching in soils where the P sorption/binding capacity is saturated. Efficient use of P in potato cultivation is therefore crucial in order to reduce P consumption and environmental impacts.

The thesis improves the current understanding of potato P requirements as regards optimising P application strategies, use efficiency and potato tuber yield. The results show that split P applications can improve P recovery by 25%, particularly on soils with low P content and low buffering capacity, and can improve physiological P use efficiency (PPUE) where P availability is limiting yield. Irrigation and subsoiling can both significantly improve P recovery, PPUE and yield. Foliar application does not improve PPUE, but can increase P concentration and yield if the plant is supplied with sufficient water. However, foliar P application should not be used as a general strategy, but can be recommended where the soil buffering capacity is extremely high. It is shown in this thesis that many Swedish soils contain sufficient amounts of P to support optimal growth and are no longer responsive to P fertilization. To determine the responsiveness of potato yields to P, data on soil organic material, pH, soil buffering capacity and varietal characteristics are needed, in addition to the amount of P-extractable with ammonium lactate (P-AL value) used in Sweden today. More sophisticated P recommendation models which take these parameters into account are urgently needed. As long as yield effects from P fertilization cannot be predicted, excessive P fertilization will probably continue, resulting in waste of a non-renewable resource, eutrophication of the aquatic environment and reduced farm profits. The findings in this thesis contribute to understanding the complex picture of P acquisition in potato and, hopefully, to more efficient use of the non-renewable P resource.

Authors/Creators:Ekelöf, Joakim
Title:Phosphorus application strategies in potato
Subtitle:constraints and potential improvements
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2014
Volume:2014:61
Number of Pages:55
Papers/manuscripts:
NumberReferences
I.Ekelöf, J., Asp, H. & Jensen, E.S. (2012). Potato yield response to foliar application of phosphorus as affected by soil moisture and available soil phosphorus. Acta Agriculturae Scandinavica, Section B Soil Science 67(7), 637-643.
II.Ekelöf J., Lundell, J., Asp, H. & Jensen E.S. (2014). Recovery of phosphorus fertilizer in potato as affected by application strategy and soil type. J. Plant Nutr. Soil Sci. 177, 369-377.
III.Ekelöf, J., Gauman, V., Jensen, E.S. & Persson, P. Increase of starch-potato yield, phosphorus use efficiency and quality parameters by inter-row subsoiling and irrigation. Potato Research (accepted for publication).
IV.Ekelöf, J., Jensen, E.S. & Asp, H. Effects of phosphorus fertilizers on yield and quality in Swedish potato cultivation – An inventory (manuscript).
Place of Publication:Alnarp
Publisher:Department of Biosystems and Technology, Swedish University of Agricultural Sciences
Associated Programs and Other Stakeholders:SLU/LTJ - Partnership Alnarp
ISBN for printed version:978-91-576-8070-9
ISBN for electronic version:978-91-576-8071-6
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F04 Fertilizing
F Plant production > F61 Plant physiology - Nutrition
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:solanum tuberosum, phosphorus, nutrient availability (soil), fertilizer application, application methods, subsoiling, irrigation, crop yield, sweden
Keywords:Inter-row subsoiling, irrigation, starch yield, phosphorus use efficiency, foliar fertilization, phosphate, P-AL, buffering capacity, sorption, Solanum tuberosum
URN:NBN:urn:nbn:se:slu:epsilon-e-2059
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2059
ID Code:11413
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Biosystems and Technology (from 130101)
(VH) > Department of Biosystems and Technology (from 130101)
External funders:Stiftelsen Lantbruksforskning
Deposited By: Mr Joakim Ekelöf
Deposited On:19 Aug 2014 12:36
Metadata Last Modified:02 Dec 2014 11:08

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