Nitrogen and Water Effects in Drip Irrigated Cotton

Abstract

Nitrogen at five rates and water at three levels (0.6, 1.0, and 1.3 CU) were studied in a buried drip irrigation system on a Casa Grande sandy loam soil at the Maricopa Agricultural Center in 1985. Yield was increased by N at 50 lbs/Ac on the 1.0 and 1.3 CU water levels but not at the 0.6 CU water treatment. Yields were higher with increasing water application, 28.6" < 40.4" < 48.9". Soil nitrate-N was lower in 1985 than 1984 resulting in a greater fruiting and yield response to applied N fertilizer.