Effect of phosphorus application alongwith PSB, Rhizobium and VAM on P fractionation and productivity of soybean (Glycine max) Sarawgi S.K.*, Principal Scientist, Chitale Shrikant, Scientist, Tiwarp Alok1, Scientist, Bhoi Sandeep2, SRF Indira Gandhi Krishi Vishwavidyalaya, Raipur, Chhattisgarh 492 012 1Department of Soil Science & Agricultural Chemistry 2Department of Agronomy *Corresponding author Email: sarawgil959@yahoo.co.in
Online published on 10 April, 2012. Abstract A field experiments was carried out at Raipur, during 2005 to 2007 to find out the best source and level of phosphorus with and without phosphorus solubilizing microbial seed treatment for higher growth and yield of soybean [Glycine max (L.) Merr.] and soil P fraction were studied in soil after the harvest of the crop. The soil of experimental area belongs to the sub-group chromustert of the order Vertisol and was neutral to slightly alkaline in reaction, medium in organic carbon, low in available N and available P and high in available K. Application of 30 kg P2O5/ha through rock phosphate (RP) + phosphate solubilizing bacteria (PSB) + Rhizobium inoculation (Rl) + vesicular arbuscular mycorrhizae (VAM) registered significantly higher seed yield, net return and return/rupee invested in P compared to application of 60 kg P2O5/ha through rock phosphate without bio-fertilizers. The P supplied through rock phosphate and inoculated with PSB, Rl and VAM increased the N and P content of soil. PSB and VAM application over respective level of P enhanced the availability of different fraction of inorganic-P in soybean crop. Seed treatment with biofertilizers had their significant effect on microbial population in conjunction with P application. Saloid-P, Ca-P and organic-P and Al-P at 0–15 cm depth and Ca-P and organic-P at 15–30 cm depth contributed significantly for total-P after soybean. Top Keywords Inorganic P fractionation, Phosphate solubilizing bacteria, Rhizobium, vesicular arbuscular mycorrhizae (VAM). Top |