Haku
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Effects of heavy nitrogen fertilization on iron, manganese, sodium, zinc, copper, strontium, molybdenum and cobalt contents in ley grasses
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1974)
Organic ammonium salts as nitrogen fertilizers
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1972)
Effects of heavy nitrogen dressings upon release of potassium from soils cropped with ley grasses
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1973)