Chemicals humus, and the soil
Hopkins, D.P.
Chemicals humus, and the soil A simple presentation of contemporary knowledge and opinions about fertilizers, manures and soil fertility by D.P. Hopkins - London 1945 - 278 p. & 4 pls.
Chemicals
Soil
Fertilizers
Manures
Soil Fertility
631.84+631.417.2 / H 73 C
Chemicals humus, and the soil A simple presentation of contemporary knowledge and opinions about fertilizers, manures and soil fertility by D.P. Hopkins - London 1945 - 278 p. & 4 pls.
Chemicals
Soil
Fertilizers
Manures
Soil Fertility
631.84+631.417.2 / H 73 C