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Agronomy Journal Abstract -

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


This article in AJ

  1. Vol. 81 No. 1, p. 132-133
    Received: Dec 28, 1987

    * Corresponding author(s):
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  1. D. A. Magnusson ,
  2. J. Ben Asher and
  3. Y. De Malach
  1. Ramat Negev Exp. Stn., 85415 Israel



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.

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

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