TECHNOLOGY FOCUS - AGRICULTURE - Preferred Apparatus: The apparatus further comprises a control means for controlling, the excavating means (especially, the descending speed and/or ascending speed), the agitating means (especially agitating speed) and/or the feeding means, according to the pollutant concentration measured by the measuring means. The excavating means comprises, a rotary rod and an agitating head provided at a tip portion of the rotary rod. The agitating means comprises, an agitating blade (preferably, several agitating blades) rotatably mounted at an intermediate portion of the rotary rod. The agitating head is located next to an agitating blade which rotates in one direction, and the rest of the agitating blades, rotates in the opposite direction. The feeding means comprises a discharge opening disposed at an edge of at least one of the agitating blades other than the agitating blade next to the agitating head, a means for connecting the discharge opening and a tank containing at least one agent (especially housed in the rotary rod), and a means for delivering the agent to the discharge opening.Preferred Method: Step (i) of the method comprises making excavating means penetrate into the soil at a first speed, or making the excavating means penetrate into the soil at a first speed and then extracting the excavating means from the soil at a second speed (especially controlled according to the pollutant concentration determined in step iii). Step (iii) comprises, measuring the concentration of the pollutant or the pollutant in a medium sucked from a suction opening disposed at a tip portion of the rotary rod using measuring means connected with the suction opening for measuring the pollutant concentration. Step (iv) comprises, introducing an agent (as above, controlled according to pollutant concentration determined in (iii)) into the soil through a discharge opening provided on an edge of at least one of the agitating means using means for delivering he agent to a discharge opening, from a tank containing the agent. Step (iv) is carried out along step (i), at least while making an excavating means penetrate into the soil at a first speed, or while extracting the excavating means from the soil at a second speed. Step (iv) is carried out while excavating means (as above) comprises, a rotating rod, and a rotating head mounted at the tip portion of the rotating rod, penetrating into the soil at a first speed in step (i), step (ii) is carried out by rotating several agitating blades rotatable mounted on an intermediate portion of the rotating rod, and the step (iv) is carried out by introducing at least one agent though a discharge opening provided on an edge of at least one of the agitating blades next to the agitating head. The nutrient further comprises oxygen.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The pollutant is an organic compound, especially an aromatic compound e.g. a phenol compound or a haolgenated aliphatic hydrocarbon (especially di- or trichloroethylene).    TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: The microorganism is a wild-type, especially strains, J1 (FERM BP-5102), or a mutant of the wild-type strain, especially JM1 (FERM BP-5352). EXAMPLE - Colonies of J1 strain were grown on agar plates of M9 medium supplemented with 0.1% yeast extract. 8 l M9 medium containing 0.1% monosodium glutamate was put into a 10 l fermenter, to which 8 g porous cellulose carrier, 0.1 mm particle diameter and density of 0.1 g/cm3 was added. The J1 colonies were inoculated into this medium, and cultured with agitation and aeration of the medium at 15 degreesC for about 2 days. Part of the cellulose carrier particles were taken out, and shaken vigorously in a fresh M9 medium so that the microorganisms attached to the carrier would be detached. The number of the microorganisms immobilized was counted by the plate count method. As a result, 5 x 109 cells of strain J1 were immobilized per 1 cm3 carrier.    Fine sand having a water content of 12% was mixed with phenol concentration of 10 ppm based on the water in the fine sand. The fine sand not containing phenol was filled into a drum to 20 cm depth. Then, the fine sand containing phenol was layered to a depth of 45 cm and again, sand not containing phenol was layered at a depth of 20 cm to prepare a model of contaminated soil. The soil was then remediated by the above apparatus.