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
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 no...
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| Formato: | Second cycle, A2E |
| Lenguaje: | sueco Inglés |
| Publicado: |
2017
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| Acceso en línea: | https://stud.epsilon.slu.se/13029/ |
| _version_ | 1855572174299987968 |
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| author | Mesmer, Cornelia |
| author_browse | Mesmer, Cornelia |
| author_facet | Mesmer, Cornelia |
| author_sort | Mesmer, Cornelia |
| collection | Epsilon Archive for Student Projects |
| description | 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. |
| format | Second cycle, A2E |
| id | RepoSLU13029 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish Inglés |
| publishDate | 2017 |
| publishDateSort | 2017 |
| record_format | eprints |
| spelling | RepoSLU130292017-11-29T09:07:43Z https://stud.epsilon.slu.se/13029/ 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 Mesmer, Cornelia Agricultural research Plant physiology - Nutrition Soil chemistry and physics 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. 2017-11-28 Second cycle, A2E NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/13029/1/mesmer_c_171128.pdf 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: (NL, NJ) > Dept. of Soil and Environment <https://stud.epsilon.slu.se/view/divisions/OID-435.html> urn:nbn:se:slu:epsilon-s-9134 eng |
| spellingShingle | Agricultural research Plant physiology - Nutrition Soil chemistry and physics Mesmer, Cornelia 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 |
| 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | Agricultural research Plant physiology - Nutrition Soil chemistry and physics |
| url | https://stud.epsilon.slu.se/13029/ https://stud.epsilon.slu.se/13029/ |