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Optimization of thigmo morphogenetic effects for the alternative growth regulation of pot cultures by use of air-controlled stimuli (THIGMO)
Project
Project code: 2811NA057
Contract period: 01.06.2013
- 30.04.2019
Budget: 170,942 Euro
Purpose of research: Applied research
The aim of this project is to develop a novel method for alternative growth inhibition on the basis of air movement, and to introduce this system into practice. It is targeted to design an automatic control of the stimulus intensity based on the evaluation and quantification of stress signals. Further alternative methods of growth regulation, such as climate control strategies, the application of plant strengtheners or the use of electrophysiological stimuli will be integrated into the project.
Further improvements of the technical components comprised the replacement of the air pressure unit by a centrifugal or axial fan. Moreover, the air stream was guided through conduit pipes to a distribution unit and pressed through a thin opening to produce an air curtain. An alternative construction enabled the air stream application by 360° rotating tubes.
A movable watering carriage served as carrier unit for the air distribution unit.
All technical configurations showed that the application of a regular and directed air stream results in a compact and robust growth habit of treated plants.
It was demonstrated that the stimulus intensity is of major significance for the degree of stem growth inhibition, whereas the stimulus frequency seems to have an inferior role. However, the efficacy of the air stream treatment depends on the natural growth habitat of the plant.
Those with soft and less lignified tissue (e.g. tomato) can be bend more easily and subsequently respond to a greater extend compared to stiffer and less flexible stem tissue (e.g. Poinsettia).
The new procedure was successfully implemented into practice and enabled a local grower to produce plants with a certified Bio-based product label without any PGR applications.
In future, the plant-air stimulus interactions need to be further investigated. Thereby, specific implementation pattern of the air stream procedure for individual plant types might be recommended. The new procedure was an important step towards more sustainable plant production.
Section overview
Subjects
- Crop Protection
- Horticulture
Framework programme
Federal Organic Farming Scheme and other forms of sustainable agriculture (BÖLN)
Funding programme
Excutive institution
State Horticultural College and Research Institute (LVG), Baden Württemberg (LVG)
