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Mesmer, Cornelia, 2017. Comparing the diffusive gradient in thin film (DGT) method with water and ammonium-acetate-lactate for P extraction and extractable P required for maximum cereal yield using long-term field experiments. Second cycle, A2E. Uppsala: SLU, Dept. of Soil and Environment

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Abstract

Using more phosphorus fertilizer than needed generates unnecessary costs for farmers and can lead to eutrophication of surface waters. Up to now, most country-specific soil tests to determine P plant-availability use chemical extractions that often extract P from non-plant available pools and are not suitable for all soil types. The diffusive gradient in thin film (DGT) method was introduced as a mechanistic surrogate of plant-available phosphorus using water and diffusion in order to quantify P release. In this study, the DGT method was examined and compared with water and ammonium-acetate-lactate extraction. Water extractable P and P-DGT were highly correlated. In order to determine critical thresholds for maximum yields, soil samples from six sites from a long-term field experiment in Sweden and from one site in Switzerland, cultivated with cereals and fertilized with different P rates were used. Piecewise regression and the Mitscherlich model were used to fit extracted P data to relative yields and the piecewise regression provided better fits. Determination of DGT seemed to be superior over the two other P extraction methods to determine critical threshold values for maximum yield but all were useful.

Main title:Comparing the diffusive gradient in thin film (DGT) method with water and ammonium-acetate-lactate for P extraction and extractable P required for maximum cereal yield using long-term field experiments
Authors:Mesmer, Cornelia
Supervisor:Kirchmann, Holger and Wenzel, Walter and Sinaj, Sokrat
Examiner:Gustafsson, Jon-Petter
Series:Examensarbeten / Institutionen för mark och miljö, SLU
Volume/Sequential designation:2017:17
Year of Publication:2017
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:NM025 EnvEuro - European Master in Environmental Science 120 HEC
Supervising department:(NL, NJ) > Dept. of Soil and Environment
Keywords:fertilization, plant-availability, agriculture, diffusion, phosphorus efficiency
URN:NBN:urn:nbn:se:slu:epsilon-s-9134
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-9134
Subjects:Agricultural research
Plant physiology - Nutrition
Soil chemistry and physics
Language:English
Deposited On:29 Nov 2017 09:07
Metadata Last Modified:29 Nov 2017 09:07

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