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Articles

CONTROL STRATEGY FOR THERMAL SCREENS IN GREENHOUSES: AN ALGORITHM BASED ON HEAT BALANCE

Article number

952_63

Pages

501 – 507

Language

English

Abstract

Thermal screens are known to reduce heating requirements of greenhouses and therefore are now becoming widely implemented.
Previous studies have found that delaying the thermal screens opening after sunrise can increase energy savings. The objective of this paper is to develop an algorithm defining the optimal opening of thermal screens for minimizing heat losses.
This control strategy is compared with a control strategy based on a fixed outside irradiance level.
Different thermal screens properties are evaluated.
Simulations are carried out for a south-facing attached greenhouse located in Montreal.
Simulation results quantified the heating energy consumption and the potential energy that can be stored and utilized during the cold period of the year (October to April). A thermally massive north wall acts as a passive thermal storage and buried pipes in the ground are used for additional thermal storage.
Results show that for closed greenhouses when excess energy is stored, a control scheme based on heat balance can increase slightly or significantly the total solar heat collected, depending on the type of blind used.

Publication

International Symposium on Advanced Technologies and Management Towards Sustainable Greenhouse Ecosystems: Greensys2011

Authors

D. Bastien , A.K. Athienitis

Keywords

greenhouse, control strategy, heat balance, thermal screens, emissivity, energy consumption

Full text

https://doi.org/10.17660/ActaHortic.2012.952.63

Online Articles (122)

1. SIMULATION OF FIXED AND VARIABLE FOGGING RATES IN A NATURALLY VENTILATED GREENHOUSE: WATER AND ENERGY SAVINGS AND STABILITY OF CLIMATE

2. NEURAL NETWORK PREDICTIVE CONTROL IN A NATURALLY VENTILATED AND FOG COOLED GREENHOUSE

3. ADDITIONAL ROOF VENTILATORS TO IMPROVE LEEWARD VENTILATION SYSTEMS

V. Raya | M. Parra | M.C. Cid | R. Suay | J.I. Montero

4. APPLICATIONS OF FAR-RED LIGHT EMITTING DIODES IN PLANT PRODUCTION UNDER CONTROLLED ENVIRONMENTS

C. Kubota | P. Chia | Z. Yang | Q. Li

5. DATA BASED MODELING APPROACH FOR GREENHOUSE AIR TEMPERATURE AND RELATIVE HUMIDITY

6. CLIMATE MODELLING OF A GREENHOUSE WITH PROPORTIONAL ENVIRONMENTAL CONTROL

M. Louro | F.J. Baptista | I. Mourão

7. TOWARDS A MORE SUSTAINABLE, WATER EFFICIENT PROTECTED CULTIVATION IN ARID REGIONS

J. Campen

8. MODELLING GREENHOUSE TEMPERATURE AND HUMIDITY DYNAMICS IN ORDER TO DEVELOP AN ENERGY SAVING MODEL-BASED CONTROL STRATEGY

D. Volkaerts | A. Youssef | S.E. Ozcan | V. Exadaktylos | D. Berckmans

9. IS A SUSTAINABLE PROTECTED HORTICULTURE IN ARID REGIONS ECONOMICALLY FEASIBLE?

J. Campen

10. INFLUENCE OF TWO DIFFERENT THERMAL SCREEN MANAGEMENTS ON YIELD, QUALITY AND ENERGY CONSUMPTION OF A SOILLESS TOMATO CULTURE

C. Gilli | C. Camps

11. GLOBAL SENSITIVITY ANALYSIS OF GREENHOUSE CROP MODELS

I.L. López-Cruz | A. Rojano-Aguilar | R. Salazar-Moreno | A. Ruiz-García

12. A SIMPLE KALANCHOË PHOTOSYNTHESIS MODEL FOR GREENHOUSE CLIMATE CONTROL

O. Körner | K.L. Nielsen

13. AN ALGORITHM FOR OPTIMAL FERTILIZATION WITH PURE CARBON DIOXIDE IN GREENHOUSES

C. Stanghellini | J. Bontsema | A. de Koning | E.J. Baeza

14. EFFECT OF SHADING AND GRAFTING TECHNIQUE ON GROWTH AND FRUIT PRODUCTION OF SWEET PEPPER PLANTS

J. López-Marín | M.F. Vidal | A. Gálvez | A. González

15. A CFD MODEL TO STUDY ABOVE ROOF SHADE AND ON ROOF SHADE OF GREENHOUSES

16. ASSESSMENT OF SIDEWALL AND ROOF VENTS OPENING CONFIGURATIONS TO IMPROVE AIRFLOW INSIDE GREENHOUSES

R. Gil | C.R. Bojaca | H. Casilimas | E. Schrevens | R. Suay

17. COMPUTATIONAL FLUID DYNAMICS SIMULATION OF HERBIVORE-INDUCED PLANT VOLATILES AROUND GREENHOUSES

T. Kuroyanagi | J. Abe | M. Uefune | J. Takabayashi

18. NUMERICAL ESTIMATION OF PRESSURE COEFFICIENTS OVER SINGLE AND MULTISPAN DUO PITCHED ROOF GREENHOUSES

D.L. Kateris | T.A. Kotsopoulos | V.P. Fragos | CH. Nikita-Martzopoulou

19. OPTIMIZATION OF VENT CONFIGURATION DURING VENTILATION FOR DEHUMIDIFICATION PURPOSE USING COMPUTATIONAL FLUID DYNAMICS

Keshi He | Dayue Chen | Zhenglu Liu

20. NUMERICAL ESTIMATION OF WIND LOADS ON A GREENHOUSE PROTECTED BY A NET-COVERED WINDBREAK ANALYSED AS AN INTEGRATED SYSTEM

A. Mistriotis | A. Giannoulis | D. Briassoulis

21. CFD SIMULATION OF CLIMATE CONDITIONS IN AN ECOTRON DEDICATED TO ECOSYSTEM STUDIES IN THE CONTEXT OF ENVIRONMENTAL CHANGES: PRELIMINARY RESULTS

H. Fatnassi | T. Boulard | O. Ravel | J. Roy

22. UNSTEADY COMPUTATIONAL STUDY OF AIRFLOW CHARACTERISTICS AROUND AN AGRICULTURAL STRUCTURE MODEL

G.K. Ntinas | D.L. Kateris | V.P. Fragos | N.A. Malamataris | CH. Nikita-Martzopoulou

23. PRELIMINARY EXPERIMENTAL AND CFD RESULTS ON AIRFLOW AND MICROCLIMATE PATTERNS IN A CLOSED GREENHOUSE

J.B. Pouillard | T. Boulard | H. Fatnassi | A. Grisey | J.C. Roy

24. COLOURED COVERING MATERIALS FOR PEACH PROTECTED CULTIVATION

E. Schettini | F.R. De Salvador | G. Scarascia Mugnozza | G. Vox

25. EFFECTS OF ANTI-DRIP POLYETHYLENE COVERING FILMS ON MICROCLIMATE AND CROP PRODUCTION

N. Katsoulas | T. Bartzanas | E. Kitta

26. THE EFFECT OF COLOUR PLASTIC FILMS ON THE GROWTH, YIELD AND PLANT PIGMENT CONTENT OF TOMATOES

G. Gmizo | I. Alsiņa | L. Dubova

27. INFLUENCE OF TWO NEW GREENHOUSE COVERING MATERIALS ON GREENHOUSE MICROCLIMATE AND COOLING LOAD

E. Kitta | T. Bartzanas | N. Katsoulas

28. NEW GREENHOUSE CONCEPT WITH HIGH INSULATING DOUBLE GLASS AND NEW CLIMATE CONTROL STRATEGIES – MODELLING AND FIRST RESULTS FROM A CUCUMBER EXPERIMENT

S. Hemming | F.L.K. Kempkes | J. Janse

29. EFFECT OF A DIFFUSE GLASS GREENHOUSE COVER ON ROSE PRODUCTION AND QUALITY

30. EFFECT OF CONDENSATION ON LIGHT TRANSMISSION AND ENERGY BUDGET OF SEVEN GREENHOUSE COVER MATERIALS

C. Stanghellini | M. Bruins | V. Mohammadkhani | G.J. Swinkels | P.J. Sonneveld

31. EFFECT OF DIFFUSE GLASS ON CLIMATE AND PLANT ENVIRONMENT: FIRST RESULTS FROM AN EXPERIMENT ON ROSES

F.L.K. Kempkes | C. Stanghellini | N. García Victoria | M. Bruins

32. PROPAGATION AND CULTIVATION PROTOCOLS FOR WILD CREEPING BELLFLOWERS (CAMPANULA RAPUNCULOIDES L.)

V. Scariot | W. Gaino | M. Devecchi

33. EFFECT OF CULTIVAR AND CROWN SIZE ON YIELD AND QUALITY OF STRAWBERRY FRESH BARE ROOT PLANTS IN SICILY

F. D'Anna | G. Caracciolo | A. Moncada | F. Vetrano

34. USE OF SHADING NETS TO IMPROVE QUALITY CHARACTERISTICS OF COMPACT GARDENIA (GARDENIA JASMINOIDES ELLIS) POTTED PLANT

CH. Lykas | N. Katsoulas

35. S-ABSCISIC ACID EFFECTS ON EVAPOTRANSPIRATION AND LEAF BURN IN SALVIA FARINACEA

A.E. O'Donoughue | C.A. Bartuska | J.E. Barrett

36. ROLE OF ABSCISIC ACID IN THE ADAPTATION OF GRAFTED TOMATO TO MODERATELY SUBOPTIMAL TEMPERATURE STRESS

G. Ntatsi | D. Savvas | D. Schwarz

37. PRODUCTION OF HIGH-QUALITY ALOE PLANTLETS THROUGH TISSUE CULTURE

M. Cardarelli | D. Borgognone | Y. Rouphael | G. Colla

38. EFFECTS OF DIFFERENT LEVELS OF NITROGEN ON PRODUCTION AND QUALITY OF STRAWBERRIES FROM FRESH “PLUG PLANTS”

F. D'Anna | G. Caracciolo | A. Moncada | A. Parrinello | R. Alessandro

39. CASE STUDIES OF A MODIFIED BIOLOGICAL SIMULATOR (TOMGRO) ACCORDING TO SHORT CROPPING PERIOD

G. Dimokas | N. Katsoulas | C. Kittas | M. Tchamitchian

40. IMPLEMENTATION OF MANAGEMENT PRINCIPLES ON GREENHOUSE VEGETABLES NEAR THE CITY OF THESSALONIKI

P. Nikolaidou | M. Μartika-Vakirtzi | G. Dimokas

41. EFFECT OF LIGHT REGIME ON GROWTH AND FLOWERING OF PHALAENOPSIS ORCHID

R. Paradiso | S. De Pascale

42. GROWTH OF TOMATOES UNDER HYBRID LED AND HPS LIGHTING

T.A. Dueck | J. Janse | B.A. Eveleens | F.L.K. Kempkes | L.F.M. Marcelis

43. GREENHOUSE CROP MANAGEMENT: NEW APPROACHES TO AN OLD CHALLENGE

S. De Pascale | C. Leonardi

44. A WEB-SERVER-EMBEDDED ENVIRONMENTAL CONTROL SYSTEM FOR CLOSED GREENHOUSE

Dongxian He

45. HYDROLYZED PROTEIN BASED MATERIALS FOR BIODEGRADABLE SPRAY MULCHING COATINGS

E. Schettini | L. Sartore | M. Barbaglio | G. Vox

46. SOME RESULTS ON ENVIRONMENTAL AND HUMAN TOXICITY INVOLVED BY GREENHOUSE TOMATO PRODUCTION IN FRANCE

T. Boulard | R. Brun | F. Hayer | G. Gaillard | F. Lecompte

47. DIGESTED LIVESTOCK MANURE AS ORGANIC N-FERTILIZER FOR GREENHOUSE LETTUCE

48. INFLUENCE OF THE USE OF DRIP IRRIGATION SYSTEMS AND DIFFERENT MULCHING MATERIALS ON ORNAMENTAL SUNFLOWERS IN GREENHOUSE CULTIVATION

49. STUDY OF DEGRADABLE MATERIALS FOR SOIL MULCHING IN GREENHOUSE-GROWN LETTUCE

J. López-Marín | C. Abrusci | A. González | J.A. Fernández

50. DESIGN OF A CONCENTRATED PHOTOVOLTAIC SYSTEM FOR APPLICATION IN HIGH TUNNELS

E. Wenger | M. Teitel

51. GREENHOUSE ENERGY CONSUMPTION FOR TOMATO PRODUCTION IN THE IBERIAN PENINSULA COUNTRIES

F.J. Baptista | A.T. Silva | L.M. Navas | A.C. Guimarães | J.F. Meneses

52. THERMAL PERFORMANCE OF AN UNHEATED GREENHOUSE UNDER SEMI-ARID CONDITIONS DURING THE NIGHT

K. Mesmoudi | S. Bougoul | P.E. Bournet

53. THE EFFECT OF FRESNEL LENS – SOLAR ABSORBER SYSTEMS IN GREENHOUSES

D. Chemisana | CHR. Lamnatou | Y. Tripanagnostopoulos

54. THE CLOSED SOLAR GREENHOUSE TECHNOLOGY AND EVALUATION OF ENERGY HARVESTING UNDER SUMMER CONDITIONS

55. IMPROVEMENT OF A HEAT PUMP COEFFICIENT OF PERFORMANCE USED IN GREENHOUSES

P.G. Kougias | V. Firfiris | G.G. Martzopoulos

56. PERFORMANCE OF COMBINED HEATING AND DEHUMIDIFICATION SYSTEM FOR GREENHOUSES

57. PERFORMANCE OF A COVERED CLOSED LOOP SHALLOW GEOTHERMAL GREENHOUSE HEATING SYSTEM

V. Firfiris | P.G. Kougias | CH. Nikita-Martzopoulou | G.G. Martzopoulos

58. NEXT-GENERATION, ENERGY-EFFICIENT, UNIFORM SUPPLEMENTAL LIGHTING FOR CLOSED-SYSTEM PLANT PRODUCTION

D.S. de Villiers | L.D. Albright | R. Tuck

59. INTRODUCTION AND POTENTIAL OF EXERGY ANALYSIS IN PRIMARY ENERGY SAVINGS RESEARCH FOR GREENHOUSES

F. Bronchart | P. Demeyer | M. Depaepe | J. Dewulf | E. Schrevens

60. WATER BALANCE AND ENERGY PARTITIONING IN A SEMI-CLOSED GREENHOUSE

M. Teitel | H.F. de Zwart | F.L.K. Kempkes

61. A DEHUMIDIFYING HEAT PUMP FOR GREENHOUSES

C. Migeon | A. Pierart | D. Lemesle | A. Travers | G. Chassériaux

62. A MODEL FOR PREDICTING ENERGY CONSUMPTION AND CO₂ RATE IN GLASSHOUSES

E. Brajeul | T. Beaussé

63. CONTROL STRATEGY FOR THERMAL SCREENS IN GREENHOUSES: AN ALGORITHM BASED ON HEAT BALANCE

D. Bastien | A.K. Athienitis

64. “ENERGY SUSTAINABLE GREENHOUSE” PROJECT: REDUCTION OF ENERGY CONSUMPTION AND ENERGY STORAGE IN AQUIFER

65. CLIMATE CONDITIONS IN A CLOSED GREENHOUSE AFFECT PLANT GROWTH AND SECONDARY PLANT COMPOUNDS OF TOMATOES (SOLANUM LYCOPERSICUM L.)

66. DESIGN OF A NIR-CONCENTRATOR SYSTEM INTEGRATED IN A GREENHOUSE

P.J. Sonneveld | G.L.A.M. Swinkels | B.A.J. van Tuijl | H. Janssen

67. UP SCALING AND TEST RESULTS OF AN ADVANCED FRESNEL GREENHOUSE

P.J. Sonneveld | G.L.A.M. Swinkels | B.A.J. van Tuijl | H. Janssen | H.F. de Zwart

68. A CONCEPT FOR REDUCED ENERGY DEMAND OF GREENHOUSES: THE NEXT GENERATION GREENHOUSE CULTIVATION IN THE NETHERLANDS

A. de Gelder | E.H. Poot | J.A. Dieleman | H.F. de Zwart

69. VALIDATING THE CONCEPT OF THE NEXT GENERATION GREENHOUSE CULTIVATION: AN EXPERIMENT WITH TOMATO

A. de Gelder | J.A. Dieleman

70. SENSIBLE AND LATENT HEAT RATIO IN CONTROLLED AGRICULTURE

A. Rojano-Aguilar | R. Salazar-Moreno | W. Ojeda | M. Montero | U. Schmidt

71. AN ELECTRIC FIELD SCREEN CAN CREATE PEST-FREE SPACE WITH BETTER AIR PENETRATION IN OPEN-WINDOW GREENHOUSES

72. GREENHOUSE SECTOR ASSESSMENT IN AZERBAIJAN AND PROSPECTS FOR SUSTAINABLE DEVELOPMENT

N. Katsoulas | E. Hadzilias

73. SYSTEM DYNAMICS AND PERFORMANCE FACTORS OF A LUNAR GREENHOUSE PROTOTYPE BIOREGENERATIVE LIFE SUPPORT SYSTEM

74. LESSONS LEARNED FROM EXPERIMENTS WITH SEMI-CLOSED GREENHOUSES

H.F. de Zwart

75. DESCRIPTION, OPERATION AND PRODUCTION OF THE SOUTH POLE FOOD GROWTH CHAMBER

R.L. Patterson | G.A. Giacomelli | M. Kacira | P.D. Sadler | R.M. Wheeler

76. THE COMPARISON OF DIFFERENT ENERGY-EFFICIENT PLANT LIGHTING TECHNOLOGIES

A. Lojans | J. Fridrihsons | I. Alsiņa

77. GREENHOUSE DESIGN: CONCEPTS AND TRENDS

M. Teitel | J.I. Montero | E.J. Baeza

78. TRANSFER OF MOMENTUM AND ENERGY IN AND ABOVE INFINITE SCREENHOUSES

I. Seginer

79. COCONUT FIBER: A PEAT-LIKE SUBSTRATE FOR ACIDOPHILIC PLANT CULTIVATION

A. Berruti | V. Scariot

80. EFFECTS OF GRAFTING AND SALINITY ON AGRONOMIC CHARACTERISTICS AND ION UPTAKE BY CUCUMBER PLANTS GROWN IN A CLOSED HYDROPONIC SYSTEM

S.A. Petropoulos | C. Olympios | G. Ntatsi | C. Akoumianakis | H. Passam

81. GROWTH, WATER CONSUMPTION AND USE EFFICIENCY OF SUMMER SQUASH CROP IN CLOSED RICE HUSK MEDIUM GROWING SYSTEM

R.M.N. Peil | A.S. Strassburger | L.A. da Fonseca

82. DAILY AND SEASONAL VARIATION OF NITRATE CONTENTS IN LETTUCE CULTIVARS IN HYDROPONIC SYSTEM IN SOUTHERN BRAZIL

R.M.N. Peil | L.A. da Fonseca | A.S. Strassburger | K.F. Strassburger | C.A.B. Medeiros

83. A CONTINUOUS RECIRCULATING DRIP GROWING SYSTEM

G. Mavrogianopoulos | P. Aglogalos | I. Lycoskoufis

84. CAN SUPER ABSORBENT AFFECT ON EFFICIENCY OF HYDROPONIC SYSTEMS?

M. Delshad | M. Ahrar | M. Babalar

85. EFFECT OF SALINE CONCENTRATIONS ON GROWTH OF MELON CULTIVATED UNDER PROTECTED ENVIRONMENT

T.S. Duarte | R.M.N. Peil | S. Bacchi

86. EFFECT OF PGPR APPLICATION AND NITROGEN DOSES ON BABY LEAF LETTUCE GROWN IN A FLOATING SYSTEM

87. IMPACT OF SALINITY INDUCED BY HIGH CONCENTRATION OF NACL OR BY HIGH CONCENTRATION OF NUTRIENTS ON TOMATO PLANTS

I. Lycoskoufis | G. Mavrogianopoulos | D. Savvas | G. Ntatsi

88. GROWING MEDICINAL PLANTS IN HYDROPONIC CULTURE

R. Maggini | C. Kiferle | L. Guidi | A. Pardossi | A. Raffaelli

89. THE EFFECT OF UNEQUAL DISTRIBUTION OF NACL-INDUCED SALINITY ON CUCUMBER GROWTH AND POTASSIUM ABSORPTION

G. Mavrogianopoulos | F. Lymberopoulos | M. Pelekanos | I. Lycoskoufis

90. EFFECTS OF OXYGEN SUPER-SATURATED NUTRIENT SOLUTIONS ON GREENHOUSE TOMATO

91. THE INFLUENCE OF A HYBRID SOLAR ENERGY SAVING SYSTEM ON THE GROWTH AND THE YIELD OF TOMATO CROP IN GREENHOUSES

G.K. Ntinas | Z. Morichovitis | CH. Nikita-Martzopoulou

92. THE EFFECT OF SHADING NETS ON GREENHOUSE MICROCLIMATE

93. RECENT TRENDS IN GREENHOUSE MICROCLIMATE STUDIES AND CONTRIBUTION OF CFDS

T. Boulard

94. INFLUENCE OF CO₂ ENRICHMENT IN GREENHOUSES ON PEPPER PLANT (CAPSICUM ANNUUM L.) YIELD UNDER HIGH TEMPERATURE CONDITIONS

D.T. Vafiadis | CH. Papamanthos | G.K. Ntinas | CH. Nikita-Martzopoulou

95. EFFECT OF THE HETEROGENEITY OF THE RADIATION DISTRIBUTION ON THE CROP ACTIVITY

B. Morille | C. Migeon | P.E. Bournet

96. MODELING THE EFFECT OF THE POSITION OF COOLING ELEMENTS ON THE VERTICAL PROFILE OF TRANSPIRATION IN A GREENHOUSE TOMATO CROP

C. Stanghellini | J.A. Dieleman | S. Driever | L.F.M. Marcelis

97. TEMPERATURE AND HUMIDITY RELATIONSHIP UNDER COPULA THEORY

A. Rojano-Aguilar | R. Salazar-Moreno | I.L. López-Cruz | M. Montero | U. Schmidt

98. EFFECT OF RHIZOBACTERIA ON YIELD OF HYDROPONICALLY GROWN TOMATO PLANTS

99. MICROCEPHALOTHRIPS ABDOMINALIS (THYSANOPTERA: THRIPIDAE) DISCOVERED IN SOUTHERN FRANCE

J. Pizzol | N. Desneux | C. Poncet | P. Reynaud

100. MECHANICAL DISTRIBUTION OF PHYTOSEIULUS PERSIMILIS ON CHRYSANTHEMUM

L. Zappalà | G. Manetto | G. Tropea Garzia | G. Emma | S. Failla

101. SURVEY OF THRIPS SPECIES IN HORTICULTURAL GREENHOUSES IN SOUTHERN FRANCE

102. THE OCCURRENCE OF FUSARIUM CROWN AND ROOT ROT OF TOMATO IN SOUTH AND SOUTHERN WEST OF TURKEY

L. Yolageldi | H. Ozaktan | A. Gul | B. Cakir

103. EPIDEMIOLOGY AND MANAGEMENT OF DOWNY MILDEW, A NEW PATHOGEN OF COLEUS IN THE UNITED STATES

B.R. Harlan | M.K. Hausbeck

104. EFFECT OF OCIMUM BASILICUM L. BIOLOGICAL PREPARATION ON TOMATO FRUIT QUALITY GROWN IN GREENHOUSE

105. GREENHOUSE BABY LEAF PRODUCTION OF LETTUCE AND KOMATSUNA IN SEMI-ARID CLIMATE: SEASONAL EFFECTS ON YIELD AND QUALITY

M. Kroggel | W. Lovichit | C. Kubota | C. Thomson

106. THE EFFECT OF SUPPLEMENTARY LED LIGHTING ON THE ANTIOXIDANT AND NUTRITIONAL PROPERTIES OF LETTUCE

G. Samuolienė | A. Brazaitytė | R. Sirtautas | A. Novičkovas | P. Duchovskis

107. ENVIRONMENTAL CONTROL TECHNOLOGIES TO IMPROVE GREENHOUSE PRODUCT QUALITY

C. Kubota

108. EFFECTS OF DIFFERENT ROOTSTOCKS ON PLANT GROWTH, YIELD AND QUALITY OF WATERMELON GROWN IN GREENHOUSE

G.B. Oztekin | Y. Tuzel | N. Uysal

109. ENHANCING NITROGEN USE EFFICIENCY IN CUCURBITACEAE CROPS BY GRAFTING

G. Colla | M. Cardarelli | A. Fiorillo | Y. Rouphael | E. Rea

110. GROWTH OF BLUEBERRY CULTIVARS IN NFT HYDROPONIC SYSTEM

M.W. Schuch | R.M.N. Peil | D.C. Nascimento

111. SOILLESS CULTIVATION SYSTEMS: A NEW APPROACH IN FRUIT PLANTS PROPAGATION IN SOUTHERN BRAZIL

M.W. Schuch | R.M.N. Peil

112. CULTIVATION OF VEGETABLE TRANSPLANTS USING SOLID-STATE LAMPS FOR THE SHORT-WAVELENGTH SUPPLEMENTARY LIGHTING IN GREENHOUSES

113. ROOTING AND GROWTH OF CUTTINGS FROM ETHYLENE-LOW OR ETHYLENE-HIGH SENSITIVE MINIATURE ROSE GENOTYPES UNDER MIST CONDITION

N. Ahmadi

114. CHRYSANTHEMUM MORIFOLIUM RESPONSE TO PAR INTENSITY AS INDICATED THROUGH ELECTRICAL SIGNAL

CH. Lykas | K. Kalovrektis | V. Pigadas

115. EFFECT OF STEM AGE ON THE RESPONSE OF STEM DIAMETER VARIATIONS TO PLANT WATER STATUS IN TOMATO

116. MEASURING LEAF MOTION OF TOMATO BY MACHINE VISION

E.J. van Henten | G.E.H. Marx | J.W. Hofstee | J. Hemming | V. Sarlikioti

117. EXAMINATION OF THE SURFACE RENEWAL TECHNIQUE FOR SENSIBLE HEAT FLUX ESTIMATES IN SCREENHOUSES

Y. Mekhmandarov | M. Pirkner | U. Dicken | J. Tanny

118. DEVELOPMENT OF AN AUTOMATIC FRUIT-SET-REAGENT SPRAYING ROBOT FOR TOMATO PLANTS TO PROMOTE UNIFORM FRUIT RIPENING

H. Kurosaki | H. Ohmori | M. Takaichi

119. A LOW-COST GREENHOUSE MONITORING SYSTEM BASED ON INTERNET CONNECTIVITY

I. Gravalos | Z. Tsiropoulos | P. Xyradakis | D. Moshou | D.L. Kateris

120. UTILIZATION OF DEFICIT IRRIGATION PROGRAMS TO IMPROVE WATER MANAGEMENT WITH LEACHING LIMITATIONS

121. TOMATO STEM AND FRUIT DIAMETER DYNAMICS IN RESPONSE TO CHANGING WATER AVAILABILITY

T. De Swaef | K. Steppe | K. Verbist | W. Cornelis

122. AGRONOMICAL AND PHYSIOLOGICAL RESPONSE OF GERANIUM TO SALINITY AND BORON TOXICITY