Fecha de publicación: 31/10/2002 Fuente: WIPO "organic farming" The present invention relates to a medium material for selectively culturing prokaryotes comprising rotting organic wastes and a method for cultivating crops using same. Specifically, the present invention provides a medium material for selectively culturing prokaryotes, which activates not only blue-green algae of Anabaena sp or Nostoc sp. but also photosynthetic bacteria of Rhodopseudomonas sp. or Rhodospirillum sp. in soil. According to the method for cultivating crops selectively culturing prokaryotes of the present invention, actually the method for cultivating crops selectively culturing prokaryotes is popularized over broad arable land, cultivating of crops using prokaryotes is possible by relatively low cost, an environment pollution is prevented from using an environment pollution material as raw materials for culturing prokaryotes, physicochemical characteristics of soil is improved, nourishments are continuously provided for crops, the growth of roots of crops is promoted, the efficiency of energy metabolism of crops increases and energy consumption dicreases, and disease resistance of crops improves and damage from disease and harmful insects decrease, thereby improving the quality and productivity of crops.