Effects of Cycling in Temperature Control on Plant Growth

Tsuyoshi MATSUI; Ichiro AIGA; Takeshi OMURA; Hikaru SATO

doi:10.2525/ecb1963.10.4_179

PLANT GROWTH CABINET WITH HOT GAS BYPASS TEMPERATURE CONTROL

Canadian Journal of Plant Science ◽

10.4141/cjps69-021 ◽

1969 ◽

Vol 49 (1) ◽

pp. 111-112 ◽

Cited By ~ 1

Author(s):

K. R. Scott

Keyword(s):

Plant Growth ◽

Temperature Control ◽

Hot Gas

not available

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Effect of Arbuscular Mycorrhiza and Temperature Control on Plant Growth, Yield, and Mineral Content of Tomato Plants Grown Hydroponically

HortScience ◽

10.21273/hortsci.48.12.1470 ◽

2013 ◽

Vol 48 (12) ◽

pp. 1470-1477 ◽

Cited By ~ 6

Author(s):

Martin Makgose Maboko ◽

Isa Bertling ◽

Christian Phillipus Du Plooy

Keyword(s):

Plant Growth ◽

Nutrient Uptake ◽

Temperature Control ◽

Mycorrhizal Fungi ◽

Nutrient Concentration ◽

Growth Yield ◽

Mineral Nutrient ◽

Nutrient Concentrations ◽

Mineral Concentration ◽

Temperature Controlled

Mycorrhizal inoculation improves nutrient uptake in a range of host plants. Insufficient nutrient uptake by plants grown hydroponically is of major environmental and economic concern. Tomato seedlings, therefore, were treated with a mycorrhizal inoculant (Mycoroot™) at transplanting to potentially enhance nutrient uptake by the plant. Then seedlings were transferred to either a temperature-controlled (TC) or a non-temperature-controlled (NTC) tunnel and maintained using the recommended (100%) or a reduced (75% and 50%) nutrient concentration. Plants grown in the NTC tunnel had significantly poorer plant growth, lower fruit mineral concentration, and lower yield compared with fruit from plants in the TC tunnel. Leaves from plants in the NTC tunnel had higher microelement concentrations than those in the TC tunnel. Highest yields were obtained from plants fertigated with 75% of the recommended nutrient concentration, and not from the 100% nutrient concentration. Application of arbuscular mycorrhizal fungi (AMF) neither enhanced plant growth, nor yield, nor fruit mineral nutrient concentrations. However, temperature control positively affected the fruit Mn and Zn concentration in the TC tunnel following AMF application.

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Interpretation and Analysis About Energy Savings in Commercial Green Houses Using Custom-Made Shadenets As Well As Thermal Reflective Screens

Volume 6: Energy ◽

10.1115/imece2017-71560 ◽

2017 ◽

Author(s):

Subin MattaraChalill ◽

Chinnapalaniandi Periasamy ◽

Pillai Nandakumar ◽

Ram Karthikeyan

Keyword(s):

Energy Consumption ◽

Plant Growth ◽

Temperature Control ◽

Large Scale ◽

Energy Savings ◽

Microstructural Analysis ◽

Climatic Conditions ◽

Operational Cost ◽

Active Radiation ◽

Selection Of

Greenhouses are known to be the modern outlook for the agronomical industry in terms of high-end yield especially in the regions where climatic conditions are not stable like in the Middle East, Europe, and United States. Crop optimization is one of the major challenges facing the farmers and the controlled production centers can dictate this difficulty in the upcoming market. Greenhouses are considered as the high -tech production centers which can support the food industry to have a green revolution through the mass production of the vegetables and spices. Properly designed commercial greenhouses can increase the yield by minimizing the operational cost especially in terms of reducing the energy consumption. In order to have a properly designed greenhouse, the selection or up gradation of the shade structures can play a vital role. Conventional greenhouses are made of polycarbonate sheets and in some cases the polyhouses by using simple polyethylene sheets. In this scenario, the main drawbacks were the energy consumption, operational expenses and the effectiveness of the indoor temperature control. Custom designed shades based on the crop requirements can provide high production rate by reducing the energy consumption. The detailed microstructural analysis in conjunction with the photosynthesis demand can provide a better selection of the shade-net or curtains. Greenhouse shade structure can be upgraded using the motorized specially designed nets or by using thermal-reflective screens. This up gradation can provide four stage advantages. In stage one this can decrease the 50% of heat energy and which will save the HVAC operational cost. During the stage, two better temperature control during the day and night will provide a good environment to provide proper PAR (Photosynthetically Active Radiation)[5] for photosynthesis, in the wavelength range of 400 to 700 nanometer. Third and fourth stages are the protection from the frost as well heat stress during the different climatic conditions. In the present market condition, the commercial greenhouses are being built in large scale by neglecting the energy saving options in shade structures. The commercial greenhouses using the upgraded shade structures can save the operational cost by 25 to 30%. Selection of this shade-nets or curtains can be done using the detailed microstructural analysis of the material. Shade-nets/curtains can be controlled manually, mechanically or can be automated in large-scale greenhouses. Flowering dates in the plants can be accelerated using the shading materials and delayed by the use of control treatment, which coincides with the results obtained in the previous studies [1]. This has proven with high land experiments [2]. Greenhouse shade nets are used in order to protect crops and plants from adverse weather conditions, animals and pests, besides providing suitable conditions for plant growth. The essential performance properties required for greenhouse shade nets are the resistance to solar radiation and weathering. The intensity of the Photo Synthetically Active Radiation (PAR) directly influences plant growth. Other nonvisible radiations are ultraviolet (UV), infrared (IR) and far infrared (FIR)[16]. Polypropylene and polyester are more resistant to UV radiation than polyethylene, which is resistant to radiations in the visible region. The use of greenhouse shade nets in outdoor conditions also requires them to be resistant to abrasion[3]. The objective of the present work is to examine the effectiveness of the properly selected shade-net/curtain in commercial greenhouses in terms of high yield energy savings. This study was conducted to compare the traditional polycarbonate sheet with the innovation of properly designed shade curtain made-up from high-density polyethylene (HDPE) fiber reinforced material discover the best shading method for plant growth in an ideal energy conservation scenario. The study was conducted in the two identical greenhouses (planted with lettuce crop) located in Al Khawaneej farm in the Emirate of Dubai in the United Arab Emirates. Yield versus the energy consumption has been observed in a period of time and obtained the reduction in energy consummation of almost 20 to 30 %.

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An LED Green Light for New Plant Growth Cabinet Precise Temperature Control System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.577.325 ◽

2014 ◽

Vol 577 ◽

pp. 325-328

Author(s):

Xing Li Wu ◽

Jiang Lei Dong ◽

Fan Liang ◽

Shi Gang Cui ◽

Li Guo Tian

Keyword(s):

Control System ◽

Plant Growth ◽

Temperature Control ◽

Control Device ◽

Temperature Control System ◽

Advantages And Disadvantages ◽

Fresh Vegetables ◽

Environment Temperature ◽

The Impact ◽

Temperature Control Device

In the current, people pay more attention on food nutrition and security issues. In some places, the lack of farming land and land pollution leads to serious problem that people could not eat fresh vegetables. In order to solve these problems, "LED smart plant growth cabinet "came into being. As temperature is one of the most important control parameter that has the impact on plant growth, this paper describes a new type of temperature control system, and proposes simple, stable, precise temperature control method. In this paper we propose a new original two-dimensional temperature control strategy, which makes this cabinet has advantage over other domestic products. This paper describes the relationship between environment temperature and plant growth, and illustrates how the temperature control device works. In the experiment, we evaluated the advantages and disadvantages of this temperature control device.

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AN ENVIRONMENTAL CABINET FOR PLANT RESEARCH UTILIZING SUNLIGHT OR ARTIFICIAL ILLUMINATION

Canadian Journal of Plant Science ◽

10.4141/cjps62-079 ◽

1962 ◽

Vol 42 (3) ◽

pp. 510-514 ◽

Cited By ~ 2

Author(s):

Peter W. Voisey

Keyword(s):

Light Intensity ◽

Plant Growth ◽

Temperature Control ◽

Electric Heating ◽

Natural Light ◽

Artificial Light ◽

Electronic Temperature ◽

Maximum Variation ◽

Artificial Illumination ◽

Side Walls

To provide both natural light and artificial light for plant growth, a cabinet with glass on the side walls and top was designed for use in a greenhouse. The cabinet measures 5 feet by 7.5 feet and 5 feet high over-all. It has refrigeration cooling, electric heating and electronic temperature controls for a range of 25 to 100°F. Temperature control is regulated at ±0.5°F. while the maximum variation between different locations in the cabinet is ±2°F. Humidity is maintained by a humidifier installed in the cabinet. The light intensity from fluorescent and incandescent bulbs is 2,000 foot-candles in the center of the cabinet.

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A High Angle, Double Tilting Cold Stage for the AEI EM7

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052262 ◽

1974 ◽

Vol 32 ◽

pp. 450-451

Author(s):

P.R. Swann ◽

A.E. Lloyd

Keyword(s):

Habit Plane ◽

Temperature Control ◽

Tilt Angle ◽

Cooling System ◽

Thermal Drift ◽

High Angle ◽

Cold Stage ◽

High Degree ◽

Better Than

Figure 1 shows the design of a specimen stage used for the in situ observation of phase transformations in the temperature range between ambient and −160°C. The design has the following features a high degree of specimen stability during tilting linear tilt actuation about two orthogonal axes for accurate control of tilt angle read-out high angle tilt range for stereo work and habit plane determination simple, robust construction temperature control of better than ±0.5°C minimum thermal drift and transmission of vibration from the cooling system.

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Mechanisms of ethylene biosynthesis and response in plants

Essays in Biochemistry ◽

10.1042/bse0580061 ◽

2015 ◽

Vol 58 ◽

pp. 61-70 ◽

Cited By ~ 11

Author(s):

Paul B. Larsen

Keyword(s):

Plant Growth ◽

Growth And Development ◽

Ethylene Biosynthesis ◽

Unsaturated Hydrocarbon ◽

Flower Senescence ◽

Detailed Knowledge ◽

Plant Growth And Development ◽

Step Process ◽

Ethylene Response ◽

Ethylene Signalling

Ethylene is the simplest unsaturated hydrocarbon, yet it has profound effects on plant growth and development, including many agriculturally important phenomena. Analysis of the mechanisms underlying ethylene biosynthesis and signalling have resulted in the elucidation of multistep mechanisms which at first glance appear simple, but in fact represent several levels of control to tightly regulate the level of production and response. Ethylene biosynthesis represents a two-step process that is regulated at both the transcriptional and post-translational levels, thus enabling plants to control the amount of ethylene produced with regard to promotion of responses such as climacteric flower senescence and fruit ripening. Ethylene production subsequently results in activation of the ethylene response, as ethylene accumulation will trigger the ethylene signalling pathway to activate ethylene-dependent transcription for promotion of the response and for resetting the pathway. A more detailed knowledge of the mechanisms underlying biosynthesis and the ethylene response will ultimately enable new approaches to be developed for control of the initiation and progression of ethylene-dependent developmental processes, many of which are of horticultural significance.

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