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>Figure 4: Correlations between P uptake in above-ground biomass of winter wheat and the content of P fractions (A–F) extracted by Jiang and Gu method in plough layer soils subjected to diverse fertilization regimes for 20 years on a Loess soil.
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Figure 4: Correlations between P uptake in above-ground biomass of winter wheat and the content of P fractions (A–F) extracted by Jiang and Gu method in plough layer soils subjected to diverse fertilization regimes for 20 years on a Loess soil.