ISHS Acta Horticulturae 304: I International Workshop on Sensors in Horticulture
MICROMETRIC MEASUREMENT OF STEM DIAMETER CHANGES AS A MEANS TO DETECT NUTRITIONAL STRESS OF TOMATO PLANTS |
| Authors: | R. Brun, J.P. Tournier |
| Keywords: | Linear variable displacement transducer (L.V.D.T.), saline stress, soilless culture |
| Abstract:
Measurements of diurnal micrometric contractions and expansions were made on tomato plants using linear variable displacement transducers. Plants were cultivated under constant nutritional conditions excepted when brief feeding breaks were made, i.e. fast increase of salinity, total or partial lack of one or several nutrients over varying periods (24 and 48 hours). The objective was to find a way to detect nutritional stress of tomato plants. Linear variable displacement transducer (L.V.D.T.), measuring stem diameter variations, could be used to detect plant nutritional stress. Stem diameter changes only appeared to be a sensitive physiological indicator of nutritional stress when the root environment was subject to big fast changes. | |
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