Chemicals, humus, and the soil ; a simple presentation of contemporary knowledge and opinions about fertilizers, manures, and soil fertility /

Darwin on humus and the earthworm ; the formation of vegetable mould through the action of worms with observations on their habits /
by: Darwin, Charles, 1809-1882
Published: (1966)

Soil fertility and fertilizers /
by: Tisdale, Samuel L.
Published: (1956)

Fertilizers and soil fertility /
by: Jones, Ulysses S.
Published: (1979)

Fertilizers and soil fertility /
by: Jones, Ulysses S.
Published: (1982)

Soil fertility, and fertilizers /
by: Tisdale, Samuel L.
Published: (1966)

Soil fertility and fertilizers /
by: Tisdale, Samuel L.
Published: (1975)

Humus acids of soils /
by: Orlov, D. S. (Dmitriĭ Sergeevich)
Published: (1985)

Humus : origin, chemical composition, and importance in nature /
by: Waksman, Selman A. (Selman Abraham), 1888-1973
Published: (1938)

Humus ; origin, chemical composition, and importance in nature /
by: Waksman, Selman A. (Selman Abraham), 1888-1973
Published: (1936)

Soil fertility and fertilizers /
by: Halligan, James Edward, 1879-
Published: (1912)

Fertile soil : a grower's guide to organic & inorganic fertilizers /
by: Parnes, Robert
Published: (1990)

Soil food : 1372 ways to add fertility to your soil /
by: French, Jackie
Published: (1995)

Soil fertility and fertilizers : an introduction to nutrient management /
Published: (2005)

Electrolysis of humus solutions ; An improved method for the estimation of humus /
by: Rather, J. B. (James Burness), 1888-
Published: (1911)

The school of chemical manures ; or, Elementary principles in the use of fertilizing agents /
by: Ville, Georges, 1824-1897
Published: (1872)

Soils and fertilizers for greenhouse and garden /
by: Laurie, Alex, 1892-1982, et al.
Published: (1946)

Soil fertility management for sustainable agriculture /
by: Prasad, Rajendra, 1936-
Published: (1997)

Environmental impact of fertilizer on soil and water /
Published: (2004)

Soils and fertilizers for greenhouse and garden /
by: Laurie, Alex, 1892-1982
Published: (1948)

Soils, crops, and fertilizer use : what, how, and why guide /
by: Leonard, David K., 1941-
Published: (1980)

Fertilizers and manures /
by: Hall, A. Daniel, (Alfred Daniel), Sir, 1864-1942
Published: (1947)

Fertilizers and manures /
by: Simpson, Ken, 1921-
Published: (1986)

Fertilization of dryland and irrigated soils /
by: Hagin, J. (Josef), 1921-
Published: (1982)

Environmental impact of fertilizer on soil and water /
Published: (2004)

Study week on organic matter and soil fertility. April 22-27, 1968.
Published: (1969)

Annual soil fertility report /

Relation of pure chemical fertilizers to minor element requirements of certain field soils under intensive cropping /
by: Wellborn, F. L.
Published: (1944)

Humus chemistry : genesis, composition, reactions /
by: Stevenson, F. J.
Published: (1994)

Humus chemistry : genesis, composition, reactions /
by: Stevenson, F. J.
Published: (1982)

A student's book on soils and manures /
by: Russell, Edward J. (Edward John), 1872-1965
Published: (1915)

Soil fertility management in agroecosystems /
Published: (2016)

Managing soil fertility in the tropics : a resource guide for participatory learning and action research /
Published: (2000)

The effect of additions on the availability of soil potash and the preparation of sugar humus /
by: Fraps, G. S. (George Stronach), 1876-
Published: (1916)

Soil fertility and fertilizers : an introduction to nutrient management /
Published: (2014)

Chemistry of fertilizers and manures : a textbook for students of agriculture /
by: Mariakulandai, A., 1910-
Published: (1975)

Physical and chemical characteristics of aquatic humus /
by: Gjessing, Egil T., 1932-
Published: (1976)