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A Trickle Irrigation System for Frequent Application of Nitrogen to Experimental Plots¹

ABSTRACT

The purpose of this study was to design a trickle irrigation system which could be used for frequent applications of nitrogen (N) to experimental plots. This type of system is not practical on a large scale for field crops but could be useful in determining rates and time intervals applicable on a much larger scale for specific soils. Two distribution patterns were compared, and a free-cycling manifold system used in 1976 proved to be superior. Most field research is not conducted on perfectly level land and, according to this study, a free-cycling manifold system is essential to minimize the effects of hydraulic pressure differences between various plots, rows within plots, or both, at different elevations. Nitrogen distribution is otherwise too erratic to produce statistically different results among treatments.

¹ Contribution from the Dep. of Agron., Univ. of Georgia, Athens, Ga.

² Graduate Research Assistant, Assistant Professor, and Professor and Head, Dep. of Agron., respectively. Senior Author is presently Assistant Professor of Agron., Mississippi State Univ., Mississippi State, Miss. Second Author is presently a Soil Scientist with the USDA, Lincoln, Nebr.

Received for publication January 30, 1981. Accepted for publication April 20, 1981.