Phosphorus uptake and rhizosphere properties of intercropped and monocropped maize, faba bean, and white lupin in acidic soil |
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Authors: | Haigang Li Jianbo Shen Fusuo Zhang Petra Marschner Greg Cawthray Zed Rengel |
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Institution: | (1) Department of Plant Nutrition, Key Laboratory of Plant Soil Interactions, Ministry of Education, China Agricultural University, Beijing, 100193, People’s Republic of China;(2) Soil and Land Systems, School of Earth and Environmental Sciences, The University of Adelaide, DP 636, Adelaide, South Australia, 5005, Australia;(3) School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia;(4) Soil Science and Plant Nutrition, School of Earth and Geographical Science, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia; |
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Abstract: | Little information is available on phosphorus (P) uptake and rhizosphere processes in maize (Zea mays L.), faba bean (Vicia faba L.), and white lupin (Lupinus albus L.) when intercropped or grown alone in acidic soil. We studied P uptake and soil pH, carboxylate concentration, and microbial
community structure in the rhizosphere of maize, faba bean, and white lupin in an acidic soil with 0–250 mg P (kg−1 soil) as KH2PO4 (KP) or FePO4 (FeP) with species grown alone or intercropped. All plant species increased the pH compared to unplanted control, particularly
faba bean. High KP supply (>100 mg P kg−1) significantly increased carboxylate concentration in the rhizosphere of maize. The carboxylate composition of the rhizosphere
soil of maize and white lupin was significantly affected by P form (KP or FeP), whereas, this was not the case for faba bean.
In maize, the carboxylate composition of the rhizosphere soil differed significantly between intercropping and monocropping.
Yield and P uptake were similar in monocropping and intercropping. Monocropped faba bean had a greater concentration of phospholipid
fatty acids in the rhizosphere than that in intercropping. Intercropping changed the microbial community structure in faba
bean but not in the other corps. The results show that P supply and P form, as well as intercropping can affect carboxylate
concentration and microbial community composition in the rhizosphere, but that the effect is plant species-specific. In contrast
to previous studies in alkaline soils, intercropping of maize with legumes did not result in increased maize growth suggesting
that the legumes did not increase P availability to maize in this acidic soil. |
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