The content of available phosphorus in soils and P uptake by plants
2009
Kulhanek, M.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Agrochemie a Vyzivy Rostlin | Balik, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Agrochemie a Vyzivy Rostlin | Cerny, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Agrochemie a Vyzivy Rostlin | Kozlovsky, O.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Agrochemie a Vyzivy Rostlin | Nedved, V.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Agrochemie a Vyzivy Rostlin
Phosphorus uptake and P contents in soils were measured in the topsoil and plant samples taken on six precise field experiments with different climatic conditions. P concentrations were determined using water, 0.01M CaCl2, Mehlich 3 and anion exchange membranes (AEM) methods. All selected procedures showed that mobile and readily available P levels increased with increasing doses of applied P. Correlation analysis was performed using the Spearman test. The closest relationship was obtained for P uptake by plants and the water extraction (r = 0.81). Significant relationships were also obtained for plant uptake and the AEM, Mehlich 3 and CaCl2 methods (r = 0.44, 0.40 and 0.36, respectively). Regression analysis between P uptake and selected methods was expressed best as linear regression. Determination coefficient (R2) for P uptake and water extract was 0.66. The coefficients with other methods used were significantly lower (max. 0.20).
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