scholarly journals Energy-Saving Night Temperature Regime for Satsuma Mandarins (Citrus unshiu Marc.) Grown in a Plastic House with Heating. III. Application of Different Night Temperature Patterns

2014 ◽  
Vol 52 (3) ◽  
pp. 175-181 ◽  
Author(s):  
Taku YANO ◽  
Kimiaki MATSUBARA ◽  
Moe SHIMOOKA ◽  
Akira TAMANOI ◽  
Minoru NARAHARA ◽  
...  
Keyword(s):  
Energy Saving ◽  
Temperature Regime ◽  
Citrus Unshiu ◽  
Night Temperature

SELECTIVE CONTROL OF ANNUAL BLUEGRASS IN KENTUCKY BLUEGRASS TURF WITH LINURON

1979 ◽  
Vol 59 (2) ◽  
pp. 469-473 ◽  
Author(s):  
R. G. INGRATTA ◽  
G. R. STEPHENSON ◽  
C. M. SWITZER
Keyword(s):  
Temperature Regime ◽  
Poa Pratensis ◽  
Kentucky Bluegrass ◽  
Controlled Environment ◽  
Night Temperature ◽  
Annual Bluegrass ◽  
Selective Control ◽  
Excellent Control

Optimum top growth of annual bluegrass (Pao annua L.) and Kentucky bluegrass (Poa pratensis L.) was obtained at 24/12 °C day/night temperature regime in controlled environment studies. The tolerance of seedling Kentucky bluegrass to linuron [3-(3,4-dichlorophenyl)-1)methylurea] appeared to be greatest at this temperature regime when photoperiods were 16 h in length. A granular formulation of linuron gave excellent control of annual bluegrass in Kentucky bluegrass turf at 6.7 kg/ha when applied postemergence. At this rate, all culitivars of Kentucky bluegrass tested, with the exception of Fylking, were tolerant to linuron as a granular formulation. After application of linuron at 3.4–6.7 kg/ha, phytotoxic residues remained in the soil at sufficient levels to injure seedling Kentucky bluegrass for up to 3 mo.

Environmental Control of Flowering of Boronia megastigma (Rutaceae) and Hypocalymma angustifolium (Myrtaceae)

1994 ◽  
Vol 42 (2) ◽  
pp. 219 ◽  
Author(s):  
JS Day ◽  
BR Loveys ◽  
D Aspinall
Keyword(s):  
Temperature Regime ◽  
Flower Development ◽  
Vegetative Growth ◽  
Environmental Control ◽  
Night Temperature ◽  
Root Temperature ◽  
Aerial Parts ◽  
Temperature Regimes ◽  
Controlled Flowering

The flowering responses of Boronia megastigma Nees (Rutacae) and Hypocalymma angustifolium Endl. (Myrtaceae) to different photoperiod and temperature regimes were similar despite the fact that these species are from different families. No flowers reached anthesis in a temperature regime of 25°C day/17°C night but flowering of both species occurred in a cool temperatures (17°C day/9°C night). Photoperiod had no effect on flowering at the temperatures tested. Ten weeks of cool temperatures (17°C day/9°C night) were required for a maximum number of flowers to reach anthesis on H. angustifolium plants whereas B. megastigma plants required 15 weeks. Flower development in both species was inhibited by a large difference between day and night temperature (21°C day/5°C night) and promoted if the day/night difference was reversed (9°C day/17°C night). The temperature of the aerial parts of the plant controlled flowering, whereas vegetative growth was controlled by root temperature. Therefore, while a reduction in vegetative growth naturally coincides with the production of flowers, these events are not necessarily linked.

Carbon Dioxide Assimilation by Pineapple Plants, Ananas comosus (L.) Merr. II. Effects of Variation of the Day/Night Temperature Regime

1980 ◽  
Vol 7 (4) ◽  
pp. 375 ◽  
Author(s):  
TF Neales ◽  
PJM Sale ◽  
CP Meyer
Keyword(s):  
Temperature Regime ◽  
Co2 Assimilation ◽  
Leaf Conductance ◽  
Ananas Comosus ◽  
Co2 Efflux ◽  
Night Temperature ◽  
Cam Plants ◽  
Ambient Temperatures ◽  
Single Leaf ◽  
Enclosure Methods

The effects of variation of day/night temperature regime on the diurnal patterns of CO2 assimilation of pineapple plants were examined using single leaf and field enclosure methods. At day temperatures of 30°C, increasing night temperatures from 20 to 35°C reduced the total assimilation of CO2 per daily light/dark cycle from 6.5 to 1.3 g CO2 m-2 (leaf area) day-1, and also reduced the proportion of total CO2 assimilation that occurred at night from c. 90% to c. 40%. Decreasing day temperatures (30 to 10°C) had little effect on total daily CO2 assimilation in warm (25°C) nights, but reduced it in cooler (15°C) nights. At day temperatures of <152C, CO2 assimilation took place predominantly (60-100%) in the photoperiod. In cool (10°C) days, the normal inverted stomatal rhythm of CAM plants was reversed; leaf conductance was high (c. 1.0 mm s-1) throughout the photoperiod and a large CO2 efflux was observed, lasting c. 2 h, at the beginning of the dark period. Leaf conductance of pineapples, by day and by night, is strongly influenced by ambient temperatures, with cool conditions favouring stomatal opening.

scholarly journals Influence of Photoperiod and Minimum Overwintering Temperature on Growth of Nursery Liners

1985 ◽  
Vol 3 (1) ◽  
pp. 25-27
Author(s):  
Carol Daggett ◽  
Gerald L. Klingaman
Keyword(s):  
Plant Species ◽  
Treatment Effect ◽  
Temperature Regime ◽  
Vegetative Growth ◽  
Woody Plant ◽  
Night Temperature ◽  
Woody Plant Species ◽  
Short Day ◽  
Long Day ◽  
Euonymus Fortunei

Ten woody plant species were rooted during the summer with half of each species overwintered at 4°C (40°F) and half at 18°C (65°F) minimum night temperature. Half of the plants in each temperature regime received long day conditions while half received short day conditions. By May 1 all species except Snow azalea (Rhododendron obtusum ‘Snow’), Emerald'n Gold euonymus (Euonymus fortunei ‘Emerald 'n Gold’), and deutzia (Deutzia gracilis) had greater dry weights with the 18°C (65°F) long day regime. Deutzia was heavier under the 4°C (40°F) regime with no difference between photoperiod treatments. At 4°C (40°F) only Judd viburnum (Viburnum x juddii) was heavier with the long day regime. Plants grown until June 1, after two flushes of vegetative growth, showed less overwintering treatment effect, but Hetzi holly (Ilex crenata ‘Hetzi’), blue rug juniper (Juniperus horizontalis ‘Wiltoni’), crapemyrtle (Lagerstroemia indica ‘Centennial’), and Judd viburnum (Viburnum x juddii) were larger when grown under the 18°C (65°F) long day regime.

scholarly journals POINSETTIA GROWTH AND DEVELOPMENT IN RESPONSE TO DAY-NIGHT TEMPERATURE REGIME AND UNICONAZOLE.

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1074c-1074
Author(s):  
Richard J. McAvoy
Keyword(s):  
Leaf Area ◽  
Temperature Regime ◽  
Dry Weight ◽  
Plant Canopy ◽  
Night Temperature ◽  
Specific Leaf Weight ◽  
Leaf Weight ◽  
Temperature Regimes ◽  
Potting Medium ◽  
Total Plant

Poinsettias, Euphorbia pulcherrima Willd. cvs Lilo and Diva Starlight, were exposed to either warm day-cool night or cool day-warm night greenhouse temperature regimes. Day time temperatures were imposed between 900 to 1600 HR. Within each temperature regime, poinsettias were grown single stem or pinched and drenched with either 0.04 or 0.08 mg a.i. uniconazole per 1.6 1 pot or grown as untreated controls. Light levels (PAR) and potting medium and plant canopy temperatures were continuously monitored.Over the course of the study, the day-night temperature differential (DIF), in the plant canopy, averaged 4.2C in the warm day regime and -1.4C in the cool day regime. The average daily temperature was lower (16.9C) in the warm day regime than in the cool day regime (18.7C).DIF treatment significantly affected final leaf area, leaf and total plant dry weight, leaf area ratio and specific leaf weight, The DIF treatment by cultivar interaction was significant for final poinsettia leaf area, stem, leaf and total plant dry weight, break number and average break length. Uniconazole significantly affected final plant height, stem and total plant dry weight, break number, average break length and specific leaf weight. Uniconazole by DIF treatment effects were not significant,

A new method to determine the energy saving night temperature for vegetative growth of Phalaenopsis

2011 ◽  
Vol 158 (3) ◽  
pp. 331-345 ◽  
Author(s):  
B. Pollet ◽  
A. Kromwijk ◽  
L. Vanhaecke ◽  
P. Dambre ◽  
M.-C. Van Labeke ◽  
...  
Keyword(s):  
Energy Saving ◽  
Vegetative Growth ◽  
New Method ◽  
Night Temperature

INFLUENCE D’UN PRE-TRAITEMENT AU FROID ET DE LA TEMPERATURE NOCTURNE SUR LA CROISSANCE, LE DEVELOPPEMENT ET LE CONTENU EN ELEMENTS MINERAUX DE PLANTS DE POINSETTIA

1985 ◽  
Vol 65 (4) ◽  
pp. 1001-1010
Author(s):  
MICHEL SENECAL ◽  
BLANCHE DANSEREAU
Keyword(s):  
Temperature Regime ◽  
Dry Weight ◽  
Euphorbia Pulcherrima ◽  
Rapid Adaptation ◽  
Night Temperature ◽  
Flower Buds ◽  
Cold Pretreatment ◽  
Top Dry Weight ◽  
Pre Treatment ◽  
Nitrogen Phosphorus

To achieve more rapid adaptation of plants grown under a constant or split night temperature regime, two poinsettia cultivars (Euphorbia pulcherrima Willd ex. Klotzsch), Annette Hegg Dark Red (AHDR) and Annette Hegg Top White (AHTW), were given a cold pretreatment (PF). The PF was a 13 °C air temperature regime provided for 15 h a night during a 10-day period. The number of days to the first visible flower buds and to anthesis was longer for both cultivars having received a PF than the control plants (no pre-treatment). For AHDR only, plant height, top dry weight, the number and bract area were significantly lower after the PF when considering the average of the night temperature treatments. Regardless of the cultivar tested, no significant differences in bract diameter and root dry weight were observed between the control plants and those given a PF treatment. Whether the two cultivars were given a PF treatment or not, the split night temperature (TNP) of 16.3/14.2 °C caused a nonsignificant delay, from the appearance of first visible flower buds to anthesis, compared to those held at 16.7 °C. The most important delay of these parameters as well as the greatest reduction of bract area was obtained under a 10.8 °C night temperature. The TNP of 16.6/10.8 °C produced plants (PF or control), of both cultivars with a greater bract number and top dry weight. For the two cultivars given a PF treatment, the levels of nitrogen, phosphorus, calcium, and magnesium were greater when considering the means of the night temperature treatments.Key words: Euphorbia pulcherrima, cold pretreatment, night temperature, split night temperature

scholarly journals STUDYING CHARACTERISTICS OF GENETIC ALGORITHM FOR OPTIMIZING TEMPERATURE REGIME OF HEATED ROOMS

2020 ◽  
Vol 2020 (4) ◽  
pp. 49-61
Author(s):  
Alexander Petrovich Shuravin ◽  
Sergey Valentinovich Vologdin
Keyword(s):  
Genetic Algorithm ◽  
Energy Saving ◽  
Temperature Regime ◽  
Mathematical Formulation ◽  
Mathematical Optimization ◽  
Heating System ◽  
Optimization Methods ◽  
Actual Condition ◽  
Directed Search

The article discusses the problems of energy-saving, which can be solved by using mathematical optimization methods, and the mathematical optimization algorithms related to these problems. There has been given the review of Russian and foreign works on energy saving and energy optimization. The need for solving the problems of optimizing the thermohydraulic regimes of buildings is explained. There is given the mathematical formulation of the problem of optimizing the temperature regime of indoor areas using adjustable devices and two methods for solving the problem: the directed search method and the genetic algorithm. The above algorithms including the mathematical apparatus are described. The objective function is described as the standard deviation of the temperature of the heated rooms. Various options for using the genetic algorithm have been investigated. A modification of the genetic algorithm is proposed, which allows obtaining the best results in relation to the problem under consideration. The results of a computation experiment for the considered optimization methods are presented. The calculations were carried out for a typical building in Izhevsk under average design conditions, taking into account the actual condition of the enclosing structures, the heating system of the building, and heating devices of indoor areas. A comparative analysis of the convergence of the iterative process for various options for the application of the genetic algorithm and directional search has been carried out. It is concluded that the new modification allows us to improve the quality of the genetic algorithm. The dependence of the convergence of the genetic algorithm on its parameters was investigated and a modification of this algorithm was proposed in relation to the problem of optimizing the thermo-hydraulic modes of heated rooms. The study is of practical value in terms of using the proposed methodology of saving heat energy in the system of housing and communal services.Practical value is the ability to use in the housing and communal services to save thermal energy.

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