Purple nonsulfur bacteria (PNSB) can potentially improve rice growth, grain yield and soil fertility in acid sulfate soils (ASS) by acting as biofertilizers and bioremediators. Six strains of acid resistant PNSB (Rhodopseudomonas palustris; TLS12, VNS19, VNS32, VNS62 and VNW95, and Rhodopseudomonas harwoodiae TLW42) were evaluated, as single cultures and a mixed culture of the six strains, for their effects on rice growth and soil fertility in ASS with high Mn concentrations sampled at three sites in the Mekong Delta, Vietnam. In pot experiments, all single PNSB strains in the liquid biofertilizer, especially strain VNS32, significantly improved most plant growth parameters, rice yield, and soil fertility. They increased NH₄⁺ and available phosphorus (P_avail) but reduced Mn²⁺ compared with the controls in all three soils. In pot experiments, the solid PNSB biofertilizers significantly improved rice growth and grain yield, reduced accumulated Mn and increased soil fertility. The solid formula of six mixed strains was the most effective, followed by VNS32 singly, and lastly the carrier control with no added PNSB. In the field trials, the solid mixed PNSB biofertilizer combined with 75% NP fertilizer significantly enhanced rice growth, producing the same grain yields as 100% NP fertilizer at two of the sites, and a higher yield at one of the sites. In acidic paddy fields, acid resistant PNSB can act as biofertilizers and bioremediators to produce improvements in soil fertility and healthier rice crops.

紫色无硫细菌 (PNSB) 作为生物肥料和生物修复剂可以潜在地改善酸性硫酸盐土壤 (ASS) 中的水稻生长、粮食产量和土壤肥力。评估了六种抗酸 PNSB 菌株（Rhodopseudomonas palustris；TLS12、VNS19、VNS32、VNS62 和 VNW95 以及Rhodopseudomonas harwoodiae TLW42），作为六种菌株的单一培养物和混合培养物，它们对水稻生长和土壤肥力的影响在越南湄公河三角洲的三个地点采集了高锰浓度的 ASS。在盆栽试验中，液体生物肥料中的所有单一 PNSB 菌株，尤其是 VNS32 菌株，显着改善了大多数植物生长参数、水稻产量和土壤肥力。他们增加了NH ₄ ⁺和有效磷 ( _Pavail ) 但与所有三种土壤的对照相比降低了 Mn ^{2+ 。}在盆栽试验中，固体 PNSB 生物肥料显着提高了水稻生长和粮食产量，减少了累积的锰，增加了土壤肥力。六种混合菌株的固体配方最有效，其次是单独的VNS32，最后是不添加PNSB的载体对照。在田间试验中，固体混合 PNSB 生物肥与 75% NP 肥料的结合显着促进了水稻的生长，其中两个地点的谷物产量与 100% NP 肥料相同，而其中一个地点的产量更高。在酸性稻田中，抗酸 PNSB 可以作为生物肥料和生物修复剂，以提高土壤肥力和更健康的水稻作物。