Synopsis Nitrogen was a major factor influencing yields the year of treatment. Close clipping reduced the stand of nitrogen‐fertilized orchardgrass. Potassium effects were most striking for the longer growing periods during the year of treatment. Potassium carry‐over effects were highly significant for all growing periods.

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Synopsis Nitrogen increased orchardgrass yields significantly throughout the season. However, potassium produced a significant yield increase only at the third harvest. Both nutrients depressed the percent total fructose of the sheaths during the first two growth periods. This effect was reversed for nitrogen during the third growth period. Asparagine accumulated abnormally in the second and third harvests when potassium fell below 1.6% of the dry weight.

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