Plant Species Interactions in the Rhizosphere Increase Maize N and P Acquisition and Maize Yields in Intercropping

Abstract The aim of the study was to examine interspecific plant interactions that contribute nitrogen (N) and phosphorus (P) acquisition are likely reason for overyielding in intercropping. We conducted a field rhizobox experiment with same soil. Maize ( Zea mays L.) grown alone or intercropped companions faba bean Vicia L.), soy Glycine max (L.) Merr.), blue lupin Lupinus angustifolius white mustard Sinapis alba L.). determined isotopic N signature (δ 15 N) maize as well soil parameters (pH, phosphatase activity, nitrate) experiment. analyzed activities rhizosphere pH by zymography imaging P contents were larger intercropping than monocropping, especially field, indicating advantages acquisition. Intercropping legumes decreased δ suggesting 11–20% aboveground biomass transferred from maize. Soil revealed high bean. showed alkalinization mustard, acidification These changes companions’ mobilized also beneficial Taken together, our provides evidence ability mobilize promotes increases nutrient causes thus can fertilizer savings.