SOIL CONDITIONER FOR LAWN EARTH AND METHOD OF MANAGING LAWNGRASS GROWTH USING THE SOIL CONDITIONER

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Provided is a soil conditioner for providing conditions suitable for growth of turf in lawn-growing soil constituting the surface layer of developed land for a lawn-covered athletic field, and for maintaining the conditions over a long period of time. The soil conditioner is characterized by containing a carbonized substance which has a percent carbonization of at least 90%, which has a porous, amorphous structure including numerous pores, and which has substantially no hydroxyl group, wherein the pores contain micropores having a pore size of 0.1 µm or less in an amount of at least 25%, and the micropores are in communication with one another. The soil conditioner is employed in the form of powder or particles in a mode in which the soil conditioner is mixed with lawn-growing soil, a mode in which the soil conditioner is spread on the surface layer of lawn, or a mode in which the soil conditioner is charged into numerous holes provided in lawn.