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A Continuous Two‐Variable Design Using the Line‐Source Concept
Author(s) -
Magnusson D. A.,
Asher J. Ben,
De Malach Y.
Publication year - 1989
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1989.00021962008100010025x
Subject(s) - irrigation , salinity , water source , saline water , line (geometry) , nitrate , perpendicular , saline , line source , variable (mathematics) , environmental science , mathematics , biological system , agronomy , chemistry , biology , ecology , physics , acoustics , geometry , water resource management , mathematical analysis , organic chemistry , endocrinology
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 ( r 2 =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.