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A Continuous Two-Variable Design Using the Line-Source Concept

Jacob Blaustein Inst. for Desert Res., Ben-Gurion Univ. of the Negev, Sede Boqer Campus, 84993 Israel

Y. De Malach

Ramat Negev Exp. Stn., 85415 Israel

^* Corresponding author.

Multivariable experiments involving different water salinities are usually conducted using drip irrigation. Preparing the irrigation system to apply these different treatments requires a considerable investment of labor and materials. This study was conducted to examine an alternative irrigation system that is relatively simple and inexpensive, yet produces gradients of two variables. A variation of the line-source irrigation system was tested using water salinity and N levels as variables. The middle line of a triple line-source irrigated using saline water (7.0 dS m^–1)> while the two parallel outside lines irrigated using nonsaline water (1.0 dS m^–1). A second triple line-source using only nonsaline water was superimposed perpendicularly on the first set. Ammonium nitrate was injected into the middle line. This layout produced linear gradients for both variables (r²=0.99) perpendicular to their source and provided every possible combination of saline water concentrations (7.0–1.0 dS m^–1) and N levels (8.1–0.0 mmol L^–1). It proved to be a simple yet highly informative system.

Received for publication December 28, 1987.