Haku
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Fixation of ammonium and potassium applied simultaneously in Finnish soils
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1976)
Effects of heavy nitrogen dressings upon release of potassium from soils cropped with ley grasses
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1973)
The effects of simultaneous addition of ammonium and potassium on their fixation in some Finnish soils
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1973)