Number and weight of cotton lint fibres: variation due to high temperatures in the field

2006 ◽  
Vol 57 (5) ◽  
pp. 583 ◽  
Author(s):  
Hafeez-ur Rahman
Keyword(s):  
High Temperature ◽  
Surface Area ◽  
Temperature Regime ◽  
Combining Ability ◽  
General Combining Ability ◽  
Cotton Lint ◽  
Seed Surface ◽  
High Temperature Regime ◽  
Relative Contribution ◽  
Temperature Regimes

Seed surface area is the basic ground for lint production in cotton and, hence, a starting point for genetic improvement in lint yield. Experiments on upland cottons were carried out under 2 temperature regimes (April sown, high temperature regime; June sown, moderate regime) for 2 years in the field to study their modifying effect on phenotypic expression and combining ability of lint weight per seed (LW/S), lint weight per unit seed surface area (LW/SA), lint weight per unit fibre length (LW/FL), lint frequency (LF), number of spinnable fibres per seed (F/S), and number of spinnable fibres per unit seed surface area (F/SA). Variation among cultivars for relative decrease in the basic lint traits under high temperature regime indicated their differences in heat sensitivity. Genetic variation for all basic lint traits was low over environments but high within environments. Temperature regime was a stronger source of variation in basic lint traits than year. Temperature regimes modified phenotype, ranking among parents, and combining ability of basic lint traits. Relative contribution of specific combining ability to total variation decreased under high temperature regime for all the basic lint traits, except LW/FL, with a corresponding increase in general combining ability due to either female or male parents. Relative contribution of general combining ability due to female parents for LW/S and LW/SA, and that due to male parents for LW/SA, LF, F/S, and F/SA, increased substantially under high temperature regime. High temperature regime was favourable for the expression of additive genetic variability. From the breeding point of view, F/S and F/SA were more useful traits.

scholarly journals Growth, flowering and fruiting in tomatoes in relation to temperature, cycocel and GA.

1970 ◽  
Vol 18 (2) ◽  
pp. 105-110
Author(s):  
A.A. Abdalla ◽  
K. Verkerk
Keyword(s):  
Growth Rate ◽  
High Temperature ◽  
High Temperatures ◽  
Root Development ◽  
Temperature Regime ◽  
Low Temperatures ◽  
Fruit Set ◽  
High Temperature Regime ◽  
Temperature Regimes ◽  
Dark Green

The effects were assessed of CCC and GA on tomatoes grown either under a high temperature regime (35 degrees day and 25 degrees C. night) or at normal temperatures (22 degrees and 18 degrees ). CCC (0.4%) was applied to the soil in the pots either 2 days after transplanting or at the start of flowering; G A was applied by dipping the first truss in GA (50 p.p.m.). CCC greatly retarded the growth rate of the stems of the plants under both temperature regimes; this effect persisted for about 17 and 24 days under the high and normal temperature regimes, respectively. With plants grown at high temperatures CCC applied at the start of flowering greatly reduced flower shedding and slightly increased the fruit set and fruit development of hand-pollinated flowers. With plants grown at normal temperatures, however, the effects of CCC were slight. CCC-treated plants were sturdy with dark-green leaves which remained green longer, especially under the high temperature regime. More N accumulated in the tissues of plants grown at high temperatures than at normal temperatures, and the N content of the latter plants was considerably increased by CCC treatment. The root development of the CCC-treated plants was much more extensive than that of the untreated plants. The numbers of seeds in the hand-pollinated fruit were not affected by CCC, but at high temperatures there were considerably less seeds than at low temperatures. GA enhanced fruit set of the high-temperature plants, but the fruits were small and seedless. GA also accelerated fruit ripening by 2 and 3 weeks in the plants grown at high and normal temperatures, respectively.-Agric. Univ., Wageningen. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Effects of light and temperature on lettuce seedlings.

1973 ◽  
Vol 21 (2) ◽  
pp. 102-109 ◽  
Author(s):  
K. Verkerk ◽  
C.J.T. Spitters
Keyword(s):  
High Temperature ◽  
Light Intensity ◽  
Leaf Area ◽  
Temperature Regime ◽  
Natural Light ◽  
Light Conditions ◽  
Subsequent Growth ◽  
High Temperature Regime ◽  
Temperature Regimes ◽  
Effects Of Temperature

In the first of 2 experiments lettuces were grown either under natural light conditions in the glasshouse in December and January or under 8- or 16-h daylengths, with several temperature regimes, and the leaf area per plant was measured after 22 and 45 days. Under natural light growth during the first 22 days was slight but subsequent growth was greatest with a light/dark temperature regime of 13/13 deg C, followed by one of 17/17 deg . With an 8-h day growth with diurnally changing temperatures was much greater than with constant ones, the best results being obtained with a regime of 25/17 deg . With a 16-h day the effect of diurnal temperature was much less marked and a constant high temperature regime of 21/21 deg gave better results than one of 25/17 deg . In the second experiment the plants were grown for 4 weeks under the same temperature regimes with 8- or 16-h daylengths, but the light intensity was varied by placing the plants at 2 vertical distances from the overhead lamps and all plants receiving a 16-h daylength were shaded by cheesecloth. The best results were obtained with a 16-h daylength with the plants placed close to the lamps; the effects of temperature were not so marked, but regimes of 25/17, 21/13 or 17/17 deg were the most satisfactory. (Abstract retrieved from CAB Abstracts by CABI’s permission)

Glyphosate Activity in Potato (Solanum tuberosum) Under Different Temperature Regimes and Light Levels

Weed Science ◽  
1988 ◽  
Vol 36 (2) ◽  
pp. 137-140 ◽  
Author(s):  
John B. Masiunas ◽  
Stephen C. Weller
Keyword(s):  
Solanum Tuberosum ◽  
High Temperature ◽  
Low Temperature ◽  
Temperature Regime ◽  
Distribution Patterns ◽  
Light Level ◽  
Fresh Weight ◽  
High Temperature Regime ◽  
Light Levels ◽  
Temperature Regimes

The response of potato (Solanum tuberosumL. 'Superior’) to glyphosate [N-(phosphonomethyl)glycine] at rates between 0.28 and 2.24 kg ae/ha was determined in four environments: 24/13 or 13/4 C temperature regimes with light levels of 650 ± 53 or 320 ± 45 μE · m−2· S−1. Light level did not affect phytotoxicity ratings or shoot fresh weight following glyphosate application. Greater phytotoxicity and reduced fresh weight accumulation were observed from glyphosate at rates above 0.56 kg/ha in a high-temperature regime than for comparable plants grown at low temperature. Studies of14C-glyphosate uptake and translocation indicated that the differences in phytotoxicity were due to less glyphosate absorption at low temperature and not a shift in distribution patterns within the plant.

scholarly journals MAGNETIC INSTABILITY IN A PARITY INVARIANT TWO-DIMENSIONAL FERMION SYSTEM

2000 ◽  
Vol 14 (14) ◽  
pp. 1441-1449 ◽  
Author(s):  
M. ELIASHVILI ◽  
G. TSITSISHVILI
Keyword(s):  
High Temperature ◽  
Temperature Regime ◽  
Ground State ◽  
Finite Temperature ◽  
Two Dimensional ◽  
Fermion System ◽  
Temperature Analysis ◽  
Magnetic Instability ◽  
High Temperature Regime

We consider the parity invariant QED2+1 where the matter is represented as a mixture of fermions with opposite spins. It is argued that the perturbative ground state of the system is unstable with respect to the formation of magnetized ground state. Carrying out the finite temperature analysis we show that the magnetic instability disappears in the high temperature regime.

scholarly journals Stabilization of spin liquid in Kondo lattice: High temperature regime

1997 ◽  
Vol 230-232 ◽  
pp. 490-492 ◽  
Author(s):  
K.A. Kikoin ◽  
M.N. Kiselev ◽  
A.S. Mishchenko
Keyword(s):  
High Temperature ◽  
Temperature Regime ◽  
Kondo Lattice ◽  
Spin Liquid ◽  
High Temperature Regime

The behavior of ZrO 2 /20%Y 2 O 3 and Al 2 O 3 coatings deposited on aluminum alloys at high temperature regime

2015 ◽  
Vol 352 ◽  
pp. 178-183 ◽  
Author(s):  
G.L. Pintilei ◽  
V.I. Crismaru ◽  
M. Abrudeanu ◽  
C. Munteanu ◽  
E.R. Baciu ◽  
...  
Keyword(s):  
High Temperature ◽  
Aluminum Alloys ◽  
Temperature Regime ◽  
High Temperature Regime

Magnetic susceptibility of semimagnetic semiconductors: The high-temperature regime and the role of superexchange

1986 ◽  
Vol 33 (5) ◽  
pp. 3407-3418 ◽  
Author(s):  
J. Spal/ek ◽  
A. Lewicki ◽  
Z. Tarnawski ◽  
J. K. Furdyna ◽  
R. R. Galazka ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
High Temperature ◽  
Temperature Regime ◽  
High Temperature Regime ◽  
Semimagnetic Semiconductors

High-Temperature Ignition Kinetics of Gas Turbine Lubricating Oils

2021 ◽  
Author(s):  
Sean P. Cooper ◽  
Eric L. Petersen
Keyword(s):  
Regression Analysis ◽  
High Temperature ◽  
Low Temperature ◽  
Shock Tube ◽  
Gas Turbine ◽  
Temperature Regime ◽  
Ignition Process ◽  
High Temperature Regime ◽  
Second Stage ◽  
Arrhenius Expression

Abstract Lubricant ignition is a highly undesirable event in any mechanical system, and surprisingly minimal work has been conducted to investigate the auto-ignition properties of gas turbine lubricants. To this end, using a recently established spray injection scheme in a shock tube, two gas turbine lubricants (Mobil DTE 732 and Lubricant A from Cooper et al. 2020) were subjected to high-temperature, post-reflected-shock conditions, and OH* chemiluminescence was monitored at the sidewall location of the shock tube to measure ignition delay time (τign). A combination of an extended shock-tube driver and driver-gas tailoring were utilized to observe ignition between 1183 K and 1385 K at near-atmospheric pressures. A clear, two-stage-ignition process was observed for all tests with Mobil DTE 732, and both first and second stage τign are compared. Second stage ignition was found to be more indicative of lubricant ignition and was used to compare τign values with lubricant A. Both lubricants exhibit three ignition regimes: a high-temperature, Arrhenius-like regime (> 1275 K); an intermediate, negative-temperature-coefficient-like regime (1230–1275 K); and a low-temperature ignition regime (< 1230 K). Similar τign behavior in the high-temperature regime was seen for both lubricants, and a regression analysis using τign data from both lubricants in this region produced the Arrhenius expression τign(μs) = 4.4 × 10−14exp(96.7(kcal/mol)/RT). While lubricant A was found to be less reactive in the intermediate-temperature regime, Mobil DTE 732 was less reactive in the low-temperature regime. As the low-temperature regime is more relevant to gas turbine conditions, Mobil DTE 732 is considered more desirable for system implementation. Chemical kinetic modeling was also performed using n-hexadecane models (a lubricant surrogate suggested in the literature). The current models are unable to reproduce the three regimes observed and predict activation energies much lower than those observed in the high-temperature regime, suggesting n-hexadecane is a poor surrogate for lubricant ignition. Additionally, experiments were conducted with Jet-A for temperatures between 1145 and 1419 K around 1 atm. Good agreement is seen with both literature data and model predictions, anchoring the experiment with previously established τign measurement methods and calculations. A linear regression analysis of the Jet-A data produced the Arrhenius expression: τign(μs) = 6.39 × 10−5exp(41.4(kcal/mol)/RT).

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