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Peine, M.* ; Vitow, N.* ; Grafe, M.* ; Baum, C.* ; Zicker, T.* ; Eichler-Löbermann, B.* ; Schulz, S. ; Schloter, M. ; Leinweber, P.*

Effect of triple superphosphate and biowaste compost on mycorrhizal colonization and enzymatic P mobilization under maize in a long-term field experiment.

J. Plant Nutr. Soil Sci. 182, 167-174 (2018)

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Phosphorus (P) fertilizers and mycorrhiza formation can both significantly improve the P supply of plants, but P fertilizers might inhibit mycorrhiza formation and change the microbial P cycling. To test the dimension and consequences of P fertilizer impacts under maize (Zea mays L.), three fertilizer treatments (1) triple superphosphate (TSP, 21-30 kg P ha(-1) annually), biowaste compost (ORG, 30 Mg ha(-1) wet weight every third year) and a combination of both (OMI) were compared to a non-P-fertilized control (C) in 2015 and 2016. The test site was a long-term field experiment on a Stagnic Cambisol in Rostock (NE Germany). Soil microbial biomass P (P-mic) and soil enzyme activities involved in P mobilization (phosphatases and ss-glucosidase), plant-available P content (double lactate-extract; P-DL), mycorrhizal colonization, shoot biomass, and shoot P concentrations were determined. P deficiency led to decreased P immobilization in microbial biomass, but the maize growth was not affected. TSP application alone promoted the P uptake by the microbial biomass but reduced the mycorrhizal colonization of maize compared to the control by more than one third. Biowaste compost increased soil enzyme activities in the P cycling, increased P-mic and slightly decreased the mycorrhizal colonization of maize. Addition of TSP to biowaste compost increased the content of P-DL in soil to the level of optimal plant supply. Single TSP supply decreased the ratio of P-DL:P-mic to 1:1 from about 4:1 in the control. Decreased plant-benefits from mycorrhizal symbiosis were assumed from decreased mycorrhizal colonization of maize with TSP supply. The undesirable side effects of TSP supply on the microbial P cycling can be alleviated by the use of compost. Thus, it can be concluded that the plant-availability of P from soil amendments is controlled by the amendment-specific microbial P cycling and, likely, P transfer to plants.

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