An optimization-based methodology for irrigation control and nutrient supply is devel-
open using common measurements of greenhouse climate: The process measurement has a
long time delay, and a feed forward (FF)control loop based on a model-based estimate of
water losses is used. A long feedback loop, by which the FF model is adapted using output
error feedback , is the mechanism used to minimize The control error. To read the output
error, a drain measuring device, or soil moisture meter, is necessary. The optimization
method used is general tool developed for real-time application and is capable of
optimizing linear and non-linear systems.The minimization algorithm used is based on a
variant of the Powell direction set method in multiple dimension. It compares favorably in
speed of convergence and accuracy when compared with linear repressors for linear systems.
It is therefore used as a generalized tool embedded in a modern greenhouse management
system. The method allows on-site on-line identification of plant water needs. As a added
benefit, the method provides information for the carnation of crop transpiration models.
2001 Elsevier Science B.V. All rights reserved.
An optimization-based methodology for irrigation control and nutrient supply is devel-
open using common measurements of greenhouse climate: The process measurement has a
long time delay, and a feed forward (FF)control loop based on a model-based estimate of
water losses is used. A long feedback loop, by which the FF model is adapted using output
error feedback , is the mechanism used to minimize The control error. To read the output
error, a drain measuring device, or soil moisture meter, is necessary. The optimization
method used is general tool developed for real-time application and is capable of
optimizing linear and non-linear systems.The minimization algorithm used is based on a
variant of the Powell direction set method in multiple dimension. It compares favorably in
speed of convergence and accuracy when compared with linear repressors for linear systems.
It is therefore used as a generalized tool embedded in a modern greenhouse management
system. The method allows on-site on-line identification of plant water needs. As a added
benefit, the method provides information for the carnation of crop transpiration models.
2001 Elsevier Science B.V. All rights by assistant" style="border: none !important; display: inline-block !important; text-indent: 0px !important; float: none !important; font-weight: bold !important; height: auto !important; margin: 0px !important; min-height: 0px !important; min-width: 0px !important; padding: 0px !important; text-transform: uppercase !important; text-decoration: underline !important; vertical-align: baseline !important; width: auto !important; background: transparent !important;">reserved.
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