Provided is environment-friendly mixed culture soil using fine rice straw powder, fine rice hull powder, and loess. The mixed culture soil of the present invention: has excellent soil coupling force and easily controllable viscosity upon construction, thereby facilitating construction without being running down breaks down the particles of rice straws and rice hulls to improve soil mulching and temperature adjustment ability, thereby reducing damage to summer depression and prevents surface cracks and generation of sliding by improving coupling force caused by reinforcement of aggregated structures between substances. To this end, 5-6 parts by weight of small rice straw powder having a particle size of 0.4 mm, 5-6 parts by weight of medium rice straw powder having a particle size of 0.8 mm, 5-6 parts by weight of large rice straw powder having a particle size of 1.5 mm, 2-3 parts by weight of small rice hull powder having a particle size of 0.4 mm, 3-5 parts by weight of medium rice hull powder having a particle size of 0.8 mm, 10-13 parts by weight of large rice hull powder having a particle size of 3.0 mm, 30-33 parts by weight of fermented cattle compost, 13-15 parts by weight of granite soil, 3-5 parts by weight of carbohydrate chips, and 1-2 parts by weight of soil stabilizers are mixed with 24-28 parts by weight of a loess aqueous solution, which is obtained by mixing 13-14 parts by weight of loess powder having a particle size of 0.002-0.005 mm and 3-4 parts by weight of a nanoloess solution having a particle size of 100-150 nm with 8-10 parts by weight of a furnace soil clay aqueous solution.COPYRIGHT KIPO 2016본 발명은 시공 시에 토양 결속력이 우수하고 점도 조절이 용이하여 흘러내림 없이 시공할 수 있으며, 볏짚과 왕겨의 입자를 세분화함으로써 토양의 멀칭 및 온도조절능력이 향상되도록 하여 하고현상의 피해를 줄임과 동시에, 물질 간의 떼알구조가 강화되어 나타나는 결합력의 향상으로 표면 크랙과 슬라이딩의 발생이 억제되도록 한 볏짚 미세분과 왕겨 미세분 및 황토를 이용한 친환경 혼합배양토를 제공하기 위하여, 입도 0.002~0.005mm의 황토분 13~14 중량부, 입도 100~150nm의 나노황토액 3~4 중량부를 복룡간점토 수용액 8~10 중량부에 혼합하여 얻어지는 황토 수용액 24~28 중량부에, 입도 0.4mm의 소 볏짚분 5~6
