Co-Inoculation with Phosphate-Solubilizing Microorganisms of Rock Phosphate and Phosphogypsum and Their Effect on Growth Promotion and Nutrient Uptake by Ryegrass

Marwa Amri, Dina M R Mateus, Marwa Gatrouni, M. R. Rjeibi, N. Asses, C. Abbes
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引用次数: 5

Abstract

In the previous half-century, natural rock phosphates (PN) have been a valuable alternative for phosphorus (P) fertilizer for sustainable agriculture; furthermore, phosphogypsum (PG) has been widely used as a soil amendment fertilizer since it improves some soil properties, increases crop yields, and represents an environmental concern that can make a good economic profit; this research aimed to study the effects of microbial consortia of phosphate-solubilizing microorganisms (PSM) on the solubilization of PN and PG in the soil, and their effects on promoting plant growth and nutrient assimilation using ryegrass as a plant model. Local supply of PG with Pseudomonas fluorescens (MW165744) significantly increases root proliferation and plant biomass dry weight compared to other isolates, as well as improves total P uptake, with a maximum value of 62.31 mg/pot. The opposite occurred in mixing inoculation with Pseudomonas fluorescens, Pantoea agglomerans (MW165752) and Stenotrophomonas maltophilia (MW221274), with a negligible total P assimilation of 5.39 mg/pot. Whereas the addition of Pseudomonas agglomerans with PG gave outstanding total P absorption of 57.05 mg/pot when compared with PN input of 38.06 mg/pot. Finally, the results prove that the co-inoculation of Pseudomonas fluorescens with PG could be a promising and alternative option to use it as a source of P fertilizer for plants and to maintain a high level of nutrients in the soil.
磷酸盐岩和磷石膏共接种增磷微生物对黑麦草生长和养分吸收的影响
在过去的半个世纪里,天然岩石磷酸盐(PN)已成为可持续农业中磷(P)肥料的宝贵替代品;此外,磷石膏(PG)被广泛用作土壤改良剂,因为它改善了一些土壤性质,提高了作物产量,代表了一个环保问题,可以产生良好的经济效益;本研究旨在以黑麦草为植物模型,研究土壤中增磷微生物(PSM)群落对土壤中PN和PG的增磷作用及其对植物生长和养分同化的促进作用。荧光假单胞菌(Pseudomonas fluorescens, MW165744)局部提供PG,与其他菌株相比,显著增加了根增殖和植物生物量干重,并提高了总磷吸收率,最大值为62.31 mg/pot。与荧光假单胞菌、Pantoea agglomerans (MW165752)和嗜麦芽窄养单胞菌(MW221274)混合接种时,P同化总量为5.39 mg/pot,可以忽略。与PN输入量38.06 mg/pot相比,PG添加假单胞菌对P的总吸收量为57.05 mg/pot。最后,结果证明,荧光假单胞菌与PG共接种可能是一种有前途的替代选择,可以将其作为植物磷肥的来源,并保持土壤中高水平的养分。
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