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Articles

MEASURING WATER CONTENT AND ELECTRICAL CONDUCTIVITY IN SUBSTRATES WITH TDR (TIME DOMAIN REFLECTOMETRY)

Article number

644_38

Pages

283 – 290

Language

English

Abstract

Time domain reflectometry (TDR) method was used for measuring water content and electrical conductivity in the substrate of container crops.
Calibration of water content and electrical conductivity was realised in peat and in peat-perlite (50/50) substrates.
The technique was applied with short probes (80 mm) on a 4 L container crop irrigated with one dripper per pot to follow the heterogeneity in the substrate volume and the variation during time of water content and electrical conductivity.
Spatial heterogeneity induced by drip irrigation on water content was found larger than variability between replicates and daily fluctuations.
Important daily fluctuations of electrical conductivity are discussed in relation with supplies.
Apart the direct influence of the dripper, the daily mean electrical conductivity doubles in fifteen days.

Publication

International Symposium on Growing Media and Hydroponics

Authors

S. Charpentier, V. Guérin, P. Morel, R. Tawegoum

Keywords

container crop, peat, perlite

Full text

https://doi.org/10.17660/ActaHortic.2004.644.38

Online Articles (81)

2. IRRIGATION TIMING: EFFECT ON PLANT GROWTH, PHOTOSYNTHESIS, WATER-USE EFFICIENCY AND SUBSTRATE TEMPERATURE

S.L. Warren | T.E. Bilderback

3. LIMITING NUTRIENT EMISSION FROM A CUT ROSE CLOSED SYSTEM BY HIGH-FLUX IRRIGATION AND LOW NUTRIENT CONCENTRATIONS?

R. Baas | D. van der Berg

4. A LOW-TECH HYDROPONIC SYSTEM FOR BELL PEPPER (CAPSICUM ANNUUM L.) PRODUCTION

W.H. Schnitzler | A.K. Sharma | N.S. Gruda | H.T. Heuberger

5. HYDROPONIC CULTIVATION OF MINT AND VETIVER WITH SPIROSTANE ANALOGUES OF BRASSINOSTEROIDS

6. PRODUCTION AND NITRATE CONTENT IN LAMB’S LETTUCE GROWN IN FLOATING SYSTEM

M. Gonnella | F. Serio | G. Conversa | P. Santamaria

7. COMPARISON OF TWO NUTRIENT SOLUTIONS’ EFFECT ON GROWTH AND NUTRIENT LEVELS OF LETTUCE (LACTUCA SATIVA L.) CULTIVARS

M.S. Karimaei | S. Massiha | M. Mogaddam

8. CONCENTRATION OF NUTRIENT SOLUTION AND GROWING MEDIA AFFECT GROWTH AND FLOWERING OF DORITAENOPSIS ‘TINNY TENDER’

Y.Y. Cui | M.W. Jeon | E.J. Hahn | K.Y. Paek

9. DEVELOPMENT OF VEGETABLE PRODUCTION SYSTEM BY PURIFICATION OF EUTHROPHIC TEGA-LAKE WATER

M. Takagaki | T. Maruo | Y. Shinohara

10. HYDROPONIC ALSTROEMERIA PRODUCTION: CULTIVARS, NUTRIENT SOLUTION AND VITAMINS

11. THE INFLUENCE OF THE PARTICLE SIZES ON THE PHYSICAL PROPERTIES OF GROWING MEDIA

O. Verdonck | P. Demeyer

12. GROWTH OF NURSERY CROPS IN PEAT-REDUCED AND IN PEAT-FREE SUBSTRATES

H. Bohne

13. GROWING MEDIA AND THE ENVIRONMENT LOBBY IN THE UK 1997-2001

W.R. Carlile

14. EFFECTIVENESS OF CLAY IN PEAT BASED GROWING MEDIA

J.B.G.M. Verhagen

15. PEAT SUBSTITUTES ON THE BASIS OF RECYCLED WOOD CHIPBOARD

H.-D. Molitor | A. Faber | R. Marutzky | S. Springer

16. THE EFFECT OF PEAT TYPE AND LIME ON GROWING MEDIUM PH AND STRUCTURE AND ON GROWTH OF HEBE PINGUIFOLIA ‘SUTHERLANDII’

M.J. Maher | M. Prasad

17. WULPAK USED AS A MULCH OR AN AMENDMENT FOR NURSERY POTTING SUBSTRATES

T.E. Bilderback | J.C. Neal

18. PHYSICAL, CHEMICAL AND BIOLOGICAL STUDIES OF MUNICIPAL COMPOST

H. Riahi | J. Fakhari

19. SOIL-LIKE SUBSTRATE FOR PLANT GROWING DERIVED FROM INEDIBLE PLANT MASS: PREPARING, COMPOSITION, FERTILITY

20. EFFECT OF DIFFERENT GROWING MEDIA ON THE GROWTH OF SOME BEDDING PLANTS

Z. Strojny | J.S. Nowak

21. RELEASE CHARACTERISTICS OF ORGANIC FERTILIZERS

M. Prasad | P. Simmons | M.J. Maher

22. RESIDUES OF ALEURITES FORDII (EUPHORBIACEAE) AS A COMPONENT FOR PLANT SUBSTRATES

C. Gruszynski | A.N. Kämpf

23. PEAT: DOMINATING GROWING MEDIUM IN SWEDISH HORTICULTURE

C. Bohlin | P. Holmberg

24. GROWING MEDIA FOR ORGANIC TOMATO PLANTLET PRODUCTION

K.L. Nielsen | K. Thorup-Kristensen

25. DIFFERENT PEAT TYPES AS GROWING MEDIA FOR GREENHOUSE CUT ROSE AND TOMATO – PRELIMINARY TRIALS

L. Särkkä | J. Mäkilä | R. Tahvonen | O. Reinikainen | M. Herranen

26. THE USE OF EMPTY OIL PALM FRUIT BUNCH (EFB) COMPOST AS ADDITIVE IN COCONUT DUST SOILLESS SYSTEM FOR VEGETABLE CROP PRODUCTION

M.R. Ismail | L.Y. Sze | P. Poulus | H. Ibrahim

27. EFFECTS OF OSMOTIC POTENTIALS ON GROWTH OF BEAN (PHASEOLUS VULGARIS L.) UNDER HYDROPONIC CONDITIONS

H. Alyari | F. Shekari | FB. Shekari | F.R. Khoii

28. COMPARISON OF FOUR SUBSTRATES ON THE GROWTH AND QUALITY OF TOMATOES

H. Inden | A. Torres

29. PLANT BIOASSAY FOR SUBSTRATES

R. Kemppainen | H. Avikainen | M. Herranen | O. Reinikainen | R. Tahvonen

30. EVALUATION OF DIFFERENT SUBSTRATES ON LISIANTHUS (EUSTOMA GRANDIFLORUM SHINN) GROWTH

E. Domingues Salvador | K. Minami

31. COMPARISON OF PHYSICAL AND CHEMICAL PROPERTIES OF GROWING MEDIA BASED ON THE EUROPEAN STANDARD METHOD AND THE SELF COMPACTION METHOD

H.J. Park | Y.K. Jung | K.-H. Kim | J.E. Son

32. ICAL AND CHEMICAL PROPERTIES OF ORGANIC HORTICULTURAL SUBSTRATES USED IN KOREA

J.-Y. Kang | H.-H. Lee | K.-H. Kim

33. PHYSICAL AND CHEMICAL PROPERTIES OF INORGANIC HORTICULTURAL SUBSTRATES USED IN KOREA

J.-Y. Kang | H.-H. Lee | K.-H. Kim

34. WHEAT GROWTH ON NEUTRAL AND SOIL-LIKE SUBSTRATES: CARBON DIOXIDE EXCHANGE AND MICROFLORA

35. THE EFFECT OF PHYSICAL PROPERTIES OF SOILLESS MEDIA ON PLANT PERFORMANCE – A REVIEW

M. Raviv | R. Wallach | T.J. Blom

36. CHANGES IN PHYSICAL PROPERTIES OF COIR DUST SUBSTRATES DURING CROP PRODUCTION

P.V. Nelson | Y.-M. Oh | D.K. Cassel

37. EFFECT OF ROOT COOLING AND SHADING ON GROWTH AND YIELD OF TROPICAL CAULIFLOWER (BRASSICA OLERACEAE VAR. BOTRYTIS) IN COCONUT COIR DUST CULTURE

M.R. Ismail | L.J. Ann

38. THE IMPORTANCE OF HYDRIC HISTORY ON THE PHYSICAL PROPERTIES AND WETTABILITY OF PEAT

J.C. Michel | P. Morel | L.M. Rivière

39. MEASURING WATER CONTENT AND ELECTRICAL CONDUCTIVITY IN SUBSTRATES WITH TDR (TIME DOMAIN REFLECTOMETRY)

S. Charpentier | V. Guérin | P. Morel | R. Tawegoum

40. ESTIMATION OF AVAILABLE WATER AND EVAPOTRANSPIRATION OF POTTED PLANTS WITH A FREQUENCY-DOMAIN SENSOR

R. Baas | A. Bulle | C. Vonk Noordegraaf

41. GAS COMPOSITION AND OXYGEN SUPPLY IN THE ROOT ENVIRONMENT OF SUBSTRATES IN CLOSED HYDROPONIC SYSTEMS

F.-G. Schroeder | J.H. Lieth

42. GROWING MEDIA VARYING IN PARTICLE SIZE AND SHAPE FOR GREENHOUSE TOMATO

S. Allaire | J. Caron | C. Ménard | M. Dorais

43. WATER CONTENT DETERMINATION WITH TDR IN PEAT SUBSTRATES

G. Kritz | T. Khaled

44. CHANGES IN PHYSICAL PROPERTIES OF PEAT-BASED SUBSTRATES DURING CULTIVATION PERIOD OF GERBERA

J.S. Nowak | Z. Strojny

45. ROOTS – CONNECTING THE GROWING MEDIA WITH GROWING SUCCESS

D. Schwarz

46. CHEMICAL ANALYSIS OF SUBSTRATES WITH CONTROLLED RELEASE FERTILIZER

C. de Kreij

47. CEN-METHODS (EUROPEAN STANDARDS) FOR DETERMINING PLANT AVAILABLE NUTRIENTS – A COMPARISON

A. Baumgarten

48. POSSIBILITY OF SUBSTITUTING SOILLESS FERTILIZER WITH SOIL FERTILIZER FOR GROWING LEAFY VEGETABLES IN HYDROPONICS

T. Jaenaksorn | H. Ikeda

49. INTERATIONS BETWEEN NITRATE (NO₃) AND CHLORIDE (CL) IN NUTRIENT SOLUTIONS FOR SUBSTRATE GROWN TOMATO

W. Voogt | C. Sonneveld

50. EFFECT OF NITROGEN AND POTASSIUM SUPPLY ON YIELD AND TISSUE COMPOSITION OF GREENHOUSE TOMATO

M.P.N. Gent

51. YIELD AND NUTRIENT STATUS IN THE ROOT ENVIRONMENT OF TOMATOES (LYCOPERSICON ESCULENTUM) GROWN ON CHEMICALLY ACTIVE AND INACTIVE INORGANIC SUBSTRATES

52. CHANGES IN MORPHO-PHYSIOLOGY OF ASPARAGUS OFFICINALIS L. AT DIFFERENT ELECTRICAL CONDUCTIVITIES

E. Danningsih | D.J. Woolley | M.A. Nichols

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A. Dominy | I. Bertling

54. INFLUENCES OF MINERAL NUTRITION ON GROWTH AND ELEMENTAL COMPOSITION OF HYDROPONICALLY GROWN ZUCCHINI PLANTS

55. EFFECT OF CONFINED FERTILIZER RATES ON SALINITY OF ROOT MEDIUM AND TOMATO PLANT GROWTH IN A CLOSED SYSTEM

M.S. Albaho | J.L. Green

56. ASSESSMENT OF THE POSSIBLE PHYTOTOXICITY OF A SUBSTRATE USING AN EASY AND REPRESENTATIVE BIOTEST

P. Morel | G. Guillemain

57. METABOLITES, THEIR DECOMPOSITION, PRODUCTION OF TOMATO AND BIOASSAYS FROM OPEN AND CLOSED ROCKWOOL SYSTEMS

C. de Kreij | W.T. Runia | A.M.M. van der Burg

58. EFFECTS OF SODIUM SULFATE, SODIUM BICARBONATE AND SUPPLEMENTAL CALCIUM ON THE GROWTH OF LETTUCE

Z. Bie | T. Ito | Y. Shinohara

59. GROWTH AND MINERAL UPTAKE OF POT PLANTS AS AFFECTED BY NUTRIENT SOLUTION AND CO₂ CONCENTRATIONS

J. Treder | J. Nowak

60. EVALUATION OF WATER AND NUTRITIONAL CONSUMPTION OF NEW GUINEA IMPATIENS AND POINSETTIA GROWN IN TWO COMPOST BASED SUBSTRATES

P. Frangi | G. D‘Angelo | M. Castelnuovo

61. USE OF HYDROPONIC CULTURE TO ASSESS THE MINERAL NUTRITION OF ZUCCHINI SQUASH

G. Colla | S. Fanasca | A.L. Molle | F. Saccardo

62. BEHAVIOUR OF FEEDDHA-ISOMERS IN NUTRIENT SOLUTIONS

J.D. Jordà | M.D. Bermúdez | M. Juárez | M. Cerdán | J. Sánchez-Andréu

63. MINERAL PRECIPITATION IN SOLUTION CULTURE

M. Amiri | N. Sattary

64. COMPARISON OF DIFFERENT BIOASSAYS FOR TESTING THE PHYTOTOXICITY OF GROWING MEDIA

G. Wever

65. RESPONSE TO SALINITY OF A TOMATO CROP IN MEDITERRANEAN CLIMATE CONDITIONS

J.J. Magán | N. Moreno | D. Meca | F. Cánovas

66. INFLUENCE OF FERTIGATION FREQUENCY ON THE YIELD OF SOME VEGETABLES CULTIVATED IN SAND CULTURE

S.A. Al-Ghawas | A.K. Al-Mazidi

67. CRITICAL NUTRIENT CONCENTRATIONS FOR ABSORPTION OF SOME VEGETABLES

T. Maruo | M. Takagaki | Y. Shinohara

68. SUPPRESSIVENESS OF ROOT PATHOGENS IN CLOSED CULTIVATION SYSTEMS

J. Postma

69. EFFORTS AT BIOCONTROL OF FUSARIUM OXYSPORUM F. SP. CYCLAMINIS IN PEAT MEDIA

G. Schmilewski

70. DEHYDROGENASE AS AN INDICATOR OF MICROBIAL ACTIVITY IN GROWING MEDIA

W.R. Carlile | K. Dickinson

71. ENZYME ACTIVITY IN NUTRIENT SOLUTION OF CLOSED HYDROPONIC SYSTEMS WITH INTEGRATED SLOW FILTERS

T. Brand | B.W. Alsanius

72. WATER QUALITY FOR HYDROPONICS: NUTRIENTS, BACTERIA AND ALGAE IN RAINWATER PONDS

D. Schwarz | R. Grosch | W. Gross

73. DISINFECTION OF RECIRCULATED NUTRIENT SOLUTIONS AND CONSEQUENCES TO THE NON-PATHOGENIC MICROFLORA

W. Wohanka | R. Seidel

74. UV-Oxidation Technology for Disinfection of Recirculation Water in Protected Cultivation

W.T. Runia | S. Boonstra

75. DISINFECTION OF NUTRIENT SOLUTION IN CLOSED SOILLESS SYSTEMS IN ITALY

A. Garibaldi | A. Minuto | D. Salvi

76. INVESTIGATIONS ON CROP DEVELOPMENTS AND MICROBIAL SUPPRESSIVENESS OF PYTHIUM APHANIDERMATUM AFTER DIFFERENT DISINFECTION TREATMENTS OF THE CIRCULATING NUTRIENT SOLUTION

E.A. van Os | M. Bruins | J. Postma | M.J.E.I.M. Willemsen-de Klein

77. AN INTEGRATED CONTROL MEASURE FOR PYTHIUM ROOT ROT OF HYDROPONICALLY GROWN GREENHOUSE CUCUMBERS

J.C. Tu

78. YIELD AND FRUIT QUALITY OF TOMATO GROWN IN A CLOSED HYDROPONIC GREENHOUSE SYSTEM AS AFFECTED BY YTHIUM ULTIMUM ATTACK AND BIOLOGICAL CONTROL AGENTS

79. PLANT RESPONSE OF HYDROPONICALLY GROWN TOMATO TO BACTERIZATION

B.W. Alsanius | U.E. Gertsson

80. THE EFFECTS OF ROOTING MEDIA, CO₂ ENRICHMENT, P-NUTRITION AND MYCORRHIZAL INOCULATION ON ROOTING AND GROWTH OF OSTEOSPERMUM

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81. INTERLABORATORY STUDY CEN-METHODS FOR THE ANALYSIS OF GROWING MEDIA AND SOIL IMPROVERS

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