长期不同施肥红壤磷素变化及其对产量的影响
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Change of Phosphorus in Red Soil and Its Effect to Grain Yield Under Long-Term Different Fertilizations
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图3. 长期不同施肥红壤磷素活化系数变化(1991—2016) |
Fig. 3. Change of PAC value in red soil under different fertilizations during the period of 1991-2016 |
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