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- W4229020265 abstract "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-H 2 O)) 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 ( R 2 ) > 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) ( R 2 = 0.35) > P-H 2 O ( R 2 = 0.18) > P-AL ( R 2 = 0.13). When excluding soils with P-AL:P-DGT ≥ 0.1 L g -1 , R 2 was considerably improved to 0.55 for P-AL, 0.46 for P-H 2 O, 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." @default.
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- W4229020265 date "2022-08-01" @default.
- W4229020265 modified "2023-09-26" @default.
- W4229020265 title "Wheat yield prediction by zero sink and equilibrium-type soil phosphorus tests" @default.
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- W4229020265 doi "https://doi.org/10.1016/s1002-0160(21)60049-8" @default.
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