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Studies on Uptake and Utilization of Nitrogen，Phosphorus and Potassium and Yield Advantage in Capsicum/Maize Relay Intercropping System Studies on Uptake and Utilization of Nitrogen，Phosphorus and Potassium and Yield Advantage in Capsicum/Maize Relay Intercropping System INTERCROPPING ADVANTAGE AND CONTRIBUTION OF ABOVE- AND BELOW-GROUND INTERACTIONS IN WHEAT-MAIZE INTERCROPPING