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Nitrogen-Potassium Utilization by Three Pasture Grasses¹

Synopsis: Orchardgrass yields were reduced more by the inadequacy of applications of NH₄NO₃ only, than were tall fescue or Kentucky bluegrass. Percentage of K in plant tissue decreased where NH₄NO₃ was the only fertilizer applied. Orchardgrass showed the greatest and Kentucky bluegrass the least response to differences in K. In P content and responsiveness to P availability, the species ranked: orchardgrass>tall fescue>Kentucky bluegrass. Plots receiving only NH₄NO₃ had higher percentages of crude protein. Tail fescue generally had the lowest percentage of crude protein.

² Associate Research Specialist, on leave from Soils and Crops Department, presently USAID/ARD American Embassy, Rio de Janeiro, Brazil.

Received for publication January 23, 1965.