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Direct and Residual Effects of Two Mixtures of Nitrogen and Phosphorus Upon the Growth of Acala Cotton in the Pecos Valley¹

Synopsis: Both the direct and residual effects of N and P fertilizer were representable as segments of the same linear regression equation of yield of lint on axis nodes, length of plants, N content, N uptake, yield of dry matter, harvestable bolls, and P uptake. Yield of lint did not show a regression on P content. Absorption and utilization of applied N dominated the growth and fruiting of Acala cotton for two years after application.

² Associate Professor of Soil Science, Southeastern Substation, Artesia, New Mexico.

Received for publication March 16, 1963.