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Articles

OUTDOOR RELATIVE HUMIDITY ESTIMATION

Article number

304_37

Pages

327 – 334

Language

Abstract

A research into container irrigation has been carried out by PICEA group.
Trails in experimental stations have been conducted for the years.
A method for hourly Potential EvapoTranspiration evaluation (E.T.P.H.) has been set up and tested in several nurseries.
Some problems with reliability of relative humidity sensors have induced to seek after an estimation of the variable.

Publication

I International Workshop on Sensors in Horticulture

Authors

G.M. Coulon, S. Ballas

Keywords

Full text

https://doi.org/10.17660/ActaHortic.1992.304.37

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

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

A. Ikeda | Y. Tanimura | K. Ezaki | Y. Kawai | S. Nakayama | K. Iwao | H. Kageyama

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