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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)
The effect of heavy nitrogen fertilization on sward density and winter survival of grasses
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1974)
Effects of heavy nitrogen fertilization on potassium, calcium, magnesium and phosphorus contents in ley grasses
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1974)
Effects of nitrogen fertilization on the Ca/P ratio of grass herbage
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1977)