Haku
Viitteet 1-2 / 2
Some extraction methods as indicators of need for phosphorus fertilization
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1986)
Soil phosphorus test values obtained by acid ammonium acetate, water and resin extraction as predictors of phosphorus content in timothy (Phleum pratense L.)
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1979)