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c e clapp
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Humic substances and chemical contaminants
C. E. Clapp · Wiley & Sons, Limited, John
502 sayfa · 2001
Humus / Congresses / Soils / Humic acid content / Soil chemistry
Humic substances in soil and crop sciences
P. Maccarthy, C. E. Clapp, R. L. Malcolm · Wiley & Sons, Limited, John
281 sayfa · 1990
Soils / Humus / Humic acid content / Crops and soils / Congresses
Sewage sludge
C. E. Clapp, R. H. Dowdy, William E. Larson · American Society of Agronomy
258 sayfa · 1994
Congresses / Sewage sludge as fertilizer / Technology & Industrial Arts / Sewage Disposal And Treatment / Soil Fertilization