Source and degree of soil variation in the field
James, D.W., Dow, A.I.
Source and degree of soil variation in the field The problem of samlping for soil tests estimating soil fertility status - Washington 1972 - 1-11 p. - Soil, Field, Fertility Washington Agricultural Experiment Station. Bulletin No. 749 .
Source and degree of soil variation in the field The problem of samlping for soil tests estimating soil fertility status - Washington 1972 - 1-11 p. - Soil, Field, Fertility Washington Agricultural Experiment Station. Bulletin No. 749 .