SW—Soil and Water: Methodology to simultaneously optimize the Macrocation and the Macroanion Composition of Nutrient Solutions, using Mixture Theory

✍ Scribed by G. De Rijck; E. Schrevens

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 312 KB
• Volume: 78
• Category: Article
• ISSN: 0021-8634
• DOI: 10.1006/jaer.2000.0627

✦ Synopsis

To illustrate the use of mixture theory to simultaneously optimize the macrocation and the macroanion composition of a hydroponical nutrient solution, a +3,2;3,2, double lattice design was established in the double mixture factor space (K>, Ca>, Mg>, NO\ , H PO\ and SO\ ). Only one response variable was considered: the calcium content of English ryegrass. The macronutrient composition signi"cantly a!ected the calcium content of the ryegrass. A reduced second-degree double mixture model with 20 instead of 36 parameters was selected to represent the response surface over the experimental region. The macrocation composition had a more pronounced e!ect on the calcium content of the ryegrass than the macroanion composition.