Genotype-microbes interactions in rhizosphere can be a promising approach to improve P nutrition of crop plants in acidic soils. This study explored the response of contrasting oat genotypes to the conjunctive application of microbial consortia and differently soluble phosphatic fertilizers. Effect of microbial consortia [vesicular arbuscular mycorrhiza (VAM), Azotobacter chroococum, Aspergillus niger, and Pseudomonas sp.] with tri‑calcium phosphate or potassium di‑hydrogen phosphate on the P nutrition of oat genotypes (Kent and JHO-851) was evaluated in controlled condition. Microbial consortia alone or in conjunction with 50% recommended dose of P fertilizers significantly increased the forage yield and P uptake. Kent was more responsive compared with JHO-851 to consortia and P fertilization. Plant P content in Kent genotypes showed strong correlation with microbial biomass carbon (MBC), nitrogen (MBN), acid and alkaline phosphatases activities, Bray's P and actinobacteria population in soils. Forage yield and P uptake response was similar with tri‑calcium phosphate and potassium di‑hydrogen phosphate. Root biomass, MBN and Bray's P contributed for 90% variability in P uptake. Results advocated that responsive oat genotype and microbial consortia with 50% recommended P fertilizers dose or tri- calcium phosphate can be a low-cost option for efficient P nutrition in acidic soils.

根际基因型-微生物相互作用是改善酸性土壤中作物磷营养的一种很有前景的方法。本研究探讨了对比燕麦基因型对微生物聚生体和不同可溶性磷肥联合施用的反应。微生物聚生体[水泡丛枝菌根(VAM)、色固氮菌、黑曲霉和假单胞菌的作用sp.] 与磷酸三钙或磷酸二氢钾对燕麦基因型（Kent 和 JHO-851）的 P 营养在受控条件下进行了评估。单独使用微生物聚生体或与 50% 推荐剂量的磷肥联合使用可显着提高牧草产量和磷吸收量。与 JHO-851 相比，Kent 对财团和磷肥的反应更灵敏。肯特基因型中植物磷含量与土壤中微生物生物量碳（MBC）、氮（MBN）、酸性和碱性磷酸酶活性、布雷氏磷和放线菌数量呈强相关。饲草产量和磷吸收响应与磷酸三钙和磷酸二氢钾相似。根生物量、MBN 和布雷氏磷对磷吸收的 90% 的变异性有贡献。