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Response of Orchardgrass to Fail-and Spring-Applied Nitrogen¹

Synopsis: Urea and (NH₄)₂S0₄, applied in late November or mid-December produced orchardgrass forage yields comparable to those from a March application. However, N recovery was highest from the spring application. Nitrate from NH₄N0₃ apparently leached over winter, making this N source inferior for late fall fertilization, Ureaformaldehyde showed promise only on a long term basis.

² Associate Professor of Soils.

Received for publication December 28, 1964.