Pedosphere 32(4): 543--554, 2022
ISSN 1002-0160/CN 32-1315/P
©2022 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Wheat yield prediction by zero sink and equilibrium-type soil phosphorus tests
Walter W. WENZEL1, Cornelia MESMER1, Eric J. FLORIDA1,2, Markus PUSCHENREITER1, Holger KIRCHMANN3
1Institute of Soil Research, Department of Forest and Soil Sciences, University of Natural Resources and Life Sciences Vienna, Konrad-Lorenz-Straße 24, Tulln A-3430 (Austria)
2College of Agriculture and Forestry, Mindanao State University at Naawan, Naawan 9023 (Philippines)
3Department of Soil and Environment, Swedish University of Agricultural Sciences, Box 7014, 75007 Uppsala, Lennart Hjelms väg 9, Uppsala 75651 (Sweden)
Corresponding Author:Walter W. WENZEL
      Diffusive gradients in thin films (DGT) measurements have been shown to outperform other phosphorus (P) tests in soils with strong P sorption, but this has not been confirmed for moderately weathered European soils. We compared the performance of DGT in predicting wheat grain yield in Swedish long-term fertility experiments with those of standard intensity (water-extractable P (P-H2O)) and quantity (ammonium lactate-extractable P (P-AL)) tests. A Mitscherlich-type model was used to fit wheat yield response to P application rates (0, 15, 30 or 35, and 45 kg P ha-1 year-1) in each individual trial replicate to estimate the maximum yield. For trials with clear plateau-type yield responses and the goodness of fit (R2) > 0.75, relative yields (RYs) were calculated for each P treatment and plotted against the soil P test results (n=143). The goodness of the Mitscherlich-type fits decreased in the following order:DGT-measured P (P-DGT) (R2=0.35) > P-H2O (R2=0.18) > P-AL (R2=0.13). When excluding soils with P-AL:P-DGT ≥ 0.1 L g-1, R2 was considerably improved to 0.55 for P-AL, 0.46 for P-H2O, and 0.65 for P-DGT (n=61). At 95% of maximum yield, the upper limit of P deficiency for P-DGT was 44.8 (the soils with P-AL:P-DGT < 0.1 L g-1) and 61.9 μg L-1 (all soils), falling within the range reported for other European and Australian soils (6.0-142 μg L-1). We show that in the investigated Swedish soils, DGT performed better than the quantity and intensity tests, which is attributed to its ability to capture P diffusion and resupply from the soil solid phase, similar to plant roots in the rhizosphere.
Key Words:  ammonium lactate-extractable phosphorus,diffusive gradients in thin films (DGT),distribution coefficient,long-term field experiment,Mitscherlich-type model
Citation: Wenzel W W, Mesmer C, Florida E J, Puschenreiter M, Kirchmann H. 2022. Wheat yield prediction by zero sink and equilibrium-type soil phosphorus tests. Pedosphere. 32(4): 543-554.
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