Seleccion de cepas de rizobios en suelos promisorios para el cultivo de la soya (Glycine max (L) Merril) en Colombia

Screening of Rhizobium strains in soils apt for soybean (Glycine max (L) Merril) cultivation in Colombia. Under greenhouse conditions were evaluated the effectivity of the preselected strains of the preselected strains of B. japonicum (CIAT 199, 209, 3778, 3874 and 3876), in addition to the recommended strain (CIAT 51) and one of Rhizobium spp. (CIAT 3779). In the Fluventic Haplustoll soil with an almost neutral reaction, a highly significant response to inoculation occurred. Fertilizer treatment with 150 kg N/ha produced the highest N yield. The most effective strains were CIAT 3718 and 51, which also presented the highest inoculation efficiency index values. In the Typic Pellustert soil, of alkaline reaction, there was a significant response to inoculation. The highest N yield was reached with the strains CIAT 3778 and 51, which were also statistically equal to strains CIAT 199 and 3876 as to inoculation efficiency index values, In the Arenic Haplustalf soil, with slightly acid reaction, was highly significant response to inoculation and strain CIAT 199 was the most effective. In me Fluventic Ustropept soil of slightly acid reaction, significant differences occurred between inoculation treatments. N yield was higher in the N -fertilized treatment. The best strains were CIAT 3778, 3779, and 209. In the Venic Ustropept soil, of alkaline reaction, a highly significant response to inoculation occurred. As to N yield, there were no differences between the N fertilized treatment and the strains CIAT 51, 209, and 3778; these strains were al so the most effective as to inoculation efficiency index values. A long with strain CIAT 199. In both Tropeptic Haplorthox and Typic Tropudult soils, there was no response to inoculation.