Rafi Ahmed Kidwai, College of Agriculture, J. N. Krishi Vishwa Vidyalaya, Campus - Sehore-466 001, India
A field study was carried out on soybean during Kharif 1994 and 1995 on Vertisols under rainfed conditions to evaluate the efficacy of different commercially produced phosphate solubilizing microbial (PSM) inoculants alone as well as co-inoculants with Bradyrhizobium japonicum. Results revealed that among the PSM inoculants the efficacy of Microphos (JARI) was the best followed by Anmol (MP oil Fed.) and Narmadaphos (MP Agro) with respect to soybean yield. The response trend changed when the PSM inoculum was used as coinoculant with B. japonicum, which was highest with Narmadaphos followed by microphos and Anmol. Highest net profit was recorded under Narmadaphos and B:C ratio with microphos_ Dual inoculation with PSM + B. japonicum also increased the phosphorus use efficiency and yard stick value of rock phosphatz.
