Why is subsoil unproductive? /

Why is subsoil unproductive? / Gardner, Robert Alexander. text Fort Collins : Colorado State College, Colorado Experiment Station, 1941. eng application/pdf COABAGRI100443 COABNRBC100443 Colorado Agriculture Bibliography Crops and soils. Soil erosion. COAB_21833636.pdf "http://www.acns.colostate.edu/?page=copyright"

Why is subsoil unproductive? /

Gardner, Robert Alexander.

text

Fort Collins : Colorado State College, Colorado Experiment Station,

1941.

eng

application/pdf

COABAGRI100443

COABNRBC100443

Colorado Agriculture Bibliography

Crops and soils.

Soil erosion.

COAB_21833636.pdf

"http://www.acns.colostate.edu/?page=copyright"