NOVELTY - Viable microbial composition comprises Acetobacter aceti, Beauveria bassiana, Azospirllum brasilense, Nocardia cellulans, Bacillus mucilaginosus, Metarhizium anisopliae, Trichoderma aureoviride, Arthrospira platensis, Cellulomonas fabia, Bacillus sterothermophilus, Lactobacillus casei, Methanobacterium formicium, Methanobacterium ruminantium, Thiobacillus thiooxidans, Thiobacillus ferrooxidans, Bacillus licheniformis and Bacillus polymyxa.    USE - The viable microbial composition and modifying agent are useful for improving secondary saline and alkaline land, desertification land and/or heavy metal contaminated land (claimed).    DETAILED DESCRIPTION - Viable microbial composition comprises Acetobacter aceti, Beauveria bassiana, Azospirllum brasilense, Nocardia cellulans, Bacillus mucilaginosus, Metarhizium anisopliae, Trichoderma aureoviride, Arthrospira platensis, Cellulomonas fabia, Bacillus sterothermophilus, Lactobacillus casei, Methanobacterium formicium, Methanobacterium ruminantium, Thiobacillus thiooxidans, Thiobacillus ferrooxidans, Bacillus licheniformis, Bacillus polymyxa, Streptomyces thermophilus, Thermoactinomyces vulgaris, Thermonospora curvata, Azotobacter vinelandii, Nitrosomonas europeae, Nitrobacter winogradskyi, Rhizobium japonicum, Rhizobium leguminosarum, Aspergillus oryzae, Saccharomyces cerevisiae, Penicillium notatum, Humicola insolens, Rhizopus oligosporus and Rhizoctonia cerealis. INDEPENDENT CLAIMS are also included for:    (1) microbial agent obtained by mixing the viable microbial composition and matrix comprising plant fiber, soil, animal feces, animal-derived protein, plant-derived protein and/or single cell protein, preferably mixture of rice husk, dairy manure, fish meal, soybean powder and single cell protein;    (2) modifying agent for improving secondary saline and alkaline land, desertification land and/or heavy metal contaminated land, comprising fermenting the microbial agent on animal excrement and plant fiber, where the animal excrement is livestock excrement, preferably cow dung, and the plant fiber comprises sawdust, rice husk (preferred), rice bran and straw;    (3) use of the microbial agent for preparing the modifying agent for improving secondary saline and alkaline land, desertification land and/or heavy metal contaminated land, comprising fermenting the microbial agent on animal excrement and plant fiber;    (4) use of the modifying agent for improving secondary saline and alkaline land, desertification land and/or heavy metal contaminated land; and    (5) plant surviving process in improved secondary saline and alkaline land, desertification land and/or heavy metal contaminated land, comprising applying the modifying agent for growing the plants in secondary saline and alkaline land, desertification land and/or heavy metal contaminated land.