Effects of Irrigation, Nitrogen Levels, and Plant Population on Corn Yields in Lajas Valley, P. R.

Abstract

Three field experiments using three irrigation, three nitrogen, and three plant-population levels were conducted at Lajas Substation in order to determine the effect of irrigation in combination with nitrogen fertilizer and different plant populations on the production of field corn. "Frequently irrigated" plots were irrigated when 20 percent of the available moisture had been depleted from the active root zone, "intermediately irrigated" plots when the depletion was 60 percent, and "nonirrigated" plots were used as a check. The nitrogen levels tested were 0, 80, and 160 pounds per acre, and the plant-population levels were 9,600, 14,500, and 19,400 plants per acre.