Arbuscular Mycorrhiza inoculation for Increasing the Tolerance Index and Productivity of Soybean on Marginal Soils

An efforts to increase soybean crop productivity are highly related to of nutrients availability and crops management. This research was conducted to investigate the plant tolerance index (TI) and the mycorrhizae role to increase the availability of nutrients P and soybean productivity in a dry land. Factorial randomized block design that consists of mycorrhizal factors (0, 5, 10 and 15 g of inoculant per plant) and soybean cultivars (Anjasmoro, Dering 1 and Grobogan) and the repeated three times. The results showed that mycorrhizal inoculation with a dose of 10 g mycorrhizae per plant was able to increase the root length, root volume, dry weights, grain number and the weight of 100 grains. The highest number of grains was obtained by_ the Dering 1 cultivar. In addition the higher of 100 grains weigh was resulted by the Grobogan and anjasmoro cultivar. The cultivar adaptability was increased_ by mycorrhizal inoculation on marginal soils Further more mycorrhizal inoculation gave a nonsignificant effect of tolerance index and the highest TI (1,97) was obtained _by dering cultivars. These results confirmes that the usage 10 g plant⁻¹ of mycorrhizal inoculants chould be applied for increasing the growth and soybean productivity of marginal land.