Keys to Soil Taxonomy came in the year of

A. 1960

B. 1975

C. 1990

D. 1951

Answer: Option C

Solution(By Examveda Team)

Keys to soil taxonomy came in the year 1990 and developed under the leadership of Dr. Guy Smith. Soil taxonomy is a hierarchical soil classification system with six categories or levels that are order, suborder, great group, subgroup, family and series. It is a morphogenetic soil classification system using diagnostic horizons and features to infer pathways of soil genesis and formation.