Rhizobium Inoculation Improved the Rhizosphere P Dynamics and P Uptake Capacity of Pigeon Pea Plants Grown in Strongly Weathered Soil Only under P Fertilized Conditions

The improvement of phosphorus (P) use efficiency (PUE) is a critical problem in crop production because phosphorus’ scarcity. Especially strongly weathered soil with high P fixation capacity, low PUE generally limits plant growth. Here, 70-day pigeon pea cultivation pot experiment using Ultisols, we evaluated the effects Rhizobium inoculation (−I/+I) on growth, rhizosphere, bulk dynamics, and root acquisition characteristics, or without fertilization (0P: no application; 50SSP:50 kg ha−1 single superphosphate). combination (50SSP + I) increased uptake, organic acid content per by 63%, 41%, 130%, respectively, but not (0P I). labile moderately inorganic (NaHCO3-Pi NaOH-Pi) contents were higher (55% 44%, respectively) rhizosphere than those 50SSP I treatment, indicating efficient solubilization applied under treatment. fertilized was treatment (26%) that 50SSP−I (15%). Thus, these results suggest should stimulate leading to uptake. In conclusion, effectively improved peas soil.