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Articles

THERMAL CONDUCTIVITY AS A MEASURE OF MOISTURE CONTENT OF INERT SUBSTRATES

Article number

304_27

Pages

245 – 252

Language

Abstract

A procedure to measure and control moisture content of rockwool by thermal conductivity is proposed.
The physical background, the specific probe, the calibration and some practical results are elaborated.

Publication

I International Workshop on Sensors in Horticulture

Authors

E. Schrevens, J. De Baerdemaeker, F. Vervaeke, K.U. Leuven, W. de Croylaan

Keywords

Full text

https://doi.org/10.17660/ActaHortic.1992.304.27

Online Articles (42)

2. WATER STATUS MONITORING IN GREENHOUSE CROPS

A. Baille

3. HORTICULTURAL SENSING BY PHOTOACOUSTICS AND THERMAL LENSING

D. Bicanic | P. Torfs | M. Lubbers | A. Tam

4. GREENHOUSE GROWING: OUTLOOK 2000

G.P.A. Bot

5. APPLICATION OF COMPUTERVISION SYSTEMS IN HORTICULTURE

G.R. Hack

6. SENSOR DEVELOPMENTS IN ANIMAL PRODUCTION

W. Rossing

7. CHLOROPHYLL FLUORESCENCE: A NON-DESTRUCTIVE METHOD FOR DETECTING DAMAGE IN THE PHOTOSYNTHETIC APPARATUS IN PLANTS

A.H.C.M. Schapendonk | W.J.M. Tonk | P.E.L. van der Putten | O. Dolstra | S.R. Haalstra

8. BIOSENSORS

F. Schubert | F. Scheller

9. SENSORS GALORE

K. Schurer

10. NON-CONTACT TEMPERATURE MEASUREMENT

O. Struβ

11. SENSORS IN CONTROLLED ENVIRONMENT AGRICULTURE (CEA): MEASURING GROWTH AND DEVELOPMENT

T. Takakura

12. NMR IN HORTICULTURE: IN SITU PLANT WATER BALANCE STUDIES WITH NMR

H. Van As

13. ION-SENSITIVE FIELD EFFECT TRANSISTORS

H.H. van den Vlekkert

14. AN OPTICAL LEAF WETNESS SENSOR

H. Griffioen | J.G. Kornet | K. Schurer

15. AUTOMATED INSPECTION OF PLANTS

J. Hirvonen | J. Hämäläinen | K. Murmann

16. ON LINE CO₂ ANALYSIS FOR THE DETERMINATION OF COLD TOLERANCE IN GREENHOUSE PLANTS USING A TEMPERATURE CONTROLLED LEAF CHAMBER

H. Huygens | P. Vandecasteele

17. ENVIRONMENTAL CONTROL AND OPERATION MONITORING IN A PLANT FACTORY USING ARTIFICIAL LIGHT

18. COLOUR CHARACTERIZATION OF GOLDEN DELICIOUS APPLES USING DIGITAL IMAGE PROCESSING

E. Schrevens | L. Raeymaeckers

19. ESTIMATION OF THE RELATIVE OPENING OF THE LEAF STOMATA USING ENERGY BALANCES

H.-J. Tantau

20. PLANT MONITORING BY MACHINE VISION

Bent S. Bennedsen

21. IN SITU PLANT WEIGHT MEASUREMENT OF TOMATO WITH AN ELECTRONIC FORCE GAUGE

A.N.M. de Koning | J.C. Bakker

22. USING COMPUTER VISION FOR PUTTING FLOWER BULBS UPRIGHT

R.A. Langers

23. SOME COMPARATIVE RESULTS ON EVAPOTRANSPIRATION OF GREENHOUSE ORNAMENTAL CROPS, USING LYSIMETER, GREENHOUSE H₂O BALANCE AND LVDT SENSORS

M. Baille | J.C. Laury | A. Baille

24. WATER CONTENT MEASUREMENTS IN SOIL AND ROCKWOOL SUBSTRATES: DIELECTRIC SENSORS FOR AUTOMATIC IN SITU MEASUREMENTS

M.A. Hilhorst | J. Groenwold | J.F. de Groot

25. USE OF AN OFF-THE-SHELF ELECTRONIC BALANCE FOR MONITORING CROP TRANSPIRATION IN GREENHOUSES

W. Meurs | C. Stanghellini

26. ON-LINE MATRIC POTENTIAL SENSORS FOR IRRIGATION CONTROL IN PEAT-BASED SOILLESS MEDIA

A.P. Papadopoulos | M.E.D. Graham | B. Anctil

27. STEM SAP FLOW, MEASURED USING PROTON NUCLEAR MAGNETIC RESONANCE, IN COMPARISON WITH TRANSPIRATION AND WATER UPTAKE OF CUCUMBER IN A GREENHOUSE CLIMATE

P.A.C.M. van de Sanden | J.E.A. Reinders | P.A. de Jager | H. van As

28. THERMAL CONDUCTIVITY AS A MEASURE OF MOISTURE CONTENT OF INERT SUBSTRATES

E. Schrevens | J. De Baerdemaeker | F. Vervaeke | K.U. Leuven | W. de Croylaan

29. MEASUREMENT OF WATER CONTENT IN SOLID MEDIA USING OF POROUS ALUMINA SENSORS

H. Wakoh | T. Hirano

30. SENSORS FOR IRRIGATION SCHEDULING OF CULTURES IN THE FIELD

C. Werkhoven

31. MICROMETRIC MEASUREMENT OF STEM DIAMETER CHANGES AS A MEANS TO DETECT NUTRITIONAL STRESS OF TOMATO PLANTS

R. Brun | J.P. Tournier

32. EVALUATION OF THE PERFORMANCE OF ION-SELECTIVE ELECTRODES IN AN AUTOMATED NFT SYSTEM

M. Heinen | K. Harmanny

33. CONTROL OF THE COMPOSITION OF THE NUTRIENT SOLUTION IN AN AUTOMATED NFT SYSTEM: A SIMULATION STUDY

M. Heinen

34. DIURNAL CHANGES IN THE ION CONCENTRATION OF THE SUPPLY AND RETURN WATER OF A TOMATO CROP GROWN ON ROCKWOOL

G. Kupers | J. van Gaalen | Th.H. Gieling | E.A. van Os

35. SENSOR FOR ION-CONTROL – AN APPROACH TO CONTROL OF NUTRIENT SOLUTION IN HYDROPONICS –

T. Morimoto | H. Nishina | Y. Hashimoto | H. Watake

36. APPLICATION OF ISFETS IN CLOSED-LOOP SYSTEMS FOR HORTICULTURE

H.H. van den Vlekkert | J.P.M. Kouwenhoven | A.A.M. van Wingerden

37. IMAGE PROCESSING APPLIED TO NURSERY STOCK SORTING

G.M. COULON | P. CHEVALIER

38. OUTDOOR RELATIVE HUMIDITY ESTIMATION

G.M. Coulon | S. Ballas

39. SYSTEM FOR MEASUREMENT OF CO₂ AND PHOTOSYNTHESIS IN GROWTH CHAMBERS

O. Haga | L. Mortensen

40. SENSING STRUCTURE IN CROP AND SOIL

W. Day

41. STUDIES ON NON-DESTRUCTIVE AND CONTINUOUS MEASUREMENT OF WATER CONTENTS AND APPLICATIONS TO IRRIGATION IN CROP CULTURE

H. Moriya | K. Iwao | H. Kageyama

42. ON-LINE ACQUISITION OF TRANSPIRATION AS A BASIS FOR ECOLOGICAL PROCESS CONTROL IN GREENHOUSES

U. Schmidt