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The effect of rate of leys and intensity of nitrogen dressing in different crop rotations II : results obtained in the years 1958-69 in a rotation trial established on clay soil at Tikkurila in 1952
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1971)
The effect of rate of leys and intensity of nitrogen dressing in different crop rotations : results obtained in the years 1958-65 from a rotation trial established at Tikkurila in 1952
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1967)