Spacing Effects on Relative Growth Rates of Diameter, Height and Biomass Production in Leucaena leucocephala(Lam.) de Wit. before and after Pruning

2001 ◽  
Vol 12 (1) ◽  
pp. 77-87
Author(s):  
LOUTFY EL-JUHANY ◽  
IBRAHIM AREF
Keyword(s):  
Biomass Production ◽  
Growth Rates ◽  
Leucaena Leucocephala ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Spacing Effects ◽  
Before And After

Differences in flowering responses of wheat to temperature and photoperiod

1992 ◽  
Vol 43 (3) ◽  
pp. 575 ◽  
Author(s):  
T Manupeerapan ◽  
JL Davidson ◽  
CJ Pearson ◽  
KR Christian
Keyword(s):  
Growth Rates ◽  
Normal Development ◽  
Vegetative Period ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Ear Development ◽  
Spring Variety ◽  
Before And After ◽  
Accelerated Growth ◽  
Short Days

Apex and ear development were studied in one spring wheat (Hartog) and five winter wheats (Rosella, Maris Templar, Maris Huntsman, Priboy and Krasnodar 39) subjected to vernalizing or non-vernalizing temperatures under either short or long photoperiods until ear initiation (double ridges), followed by either short or long photoperiods until ear emergence. Hartog produced ears in all treatments, and it initiated ears faster than winter varieties in all treatments. Four types of winter wheat were distinguished by their mandatory requirements for ear development. The only winter variety to reach ear emergence without vernalization was Maris Templar; short days were an effective substitute provided that long days were experienced after ear initiation. In Priboy, photoperiod was unimportant both before and after ear initiation. Maris Huntsman and Rosella required long photoperiods after initiation, whereas Krasnodar 39 required long days during vernalization. If these conditions were not met, either the shoot apexes died without producing a terminal spikelet or the ears died before emerging. Plants in all treatments which reached ear emergence proceeded normally to maturity. The suitability of the different types for particular regions is discussed. All varieties in all treatments initiated ears when the shoot apex reached a volume of about 0.13 mm3. Relative growth rates of the apex, related to thermal time, were constant during the vegetative phase; they determined the time to ear initiation and, through it, controlled the time of ear emergence. Differences between varieties in their basic vegetative period are attributed to differences in the relative growth rates of their vegetative apexes. These growth rates were much lower in winter wheats than in the spring variety, but increased sharply in them at or just before the first visible signs of initiation in those treatments which allowed normal development. Vernalization was not the cause of this accelerated growth. In winter wheats, vernalization promoted faster initiation of ears, and hence flowering, and the survival and normal development of initiated ears. It is suggested that vernalization acts by reducing the effectiveness of an inhibitor of cell division.

Diallel Analysis of Relative Growth Rates in Maize Synthetics

Crop Science ◽  
1990 ◽  
Vol 30 (3) ◽  
pp. 549-552 ◽  
Author(s):  
M. E. Nevado ◽  
H. Z. Cross
Keyword(s):  
Growth Rates ◽  
Diallel Analysis ◽  
Relative Growth ◽  
Relative Growth Rates

Selection for biomass production based on respiration parameters in eucalypts: effects of origin and growth climates on growth rates

1996 ◽  
Vol 26 (9) ◽  
pp. 1556-1568 ◽  
Author(s):  
Thimmappa S. Anekonda ◽  
Richard S. Criddle ◽  
Lee D. Hansen ◽  
Mike Bacca
Keyword(s):  
Temperature Dependence ◽  
Growth Rates ◽  
Heat Rate ◽  
Eucalyptus Species ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Metabolic Heat ◽  
Respiratory Parameters ◽  
Metabolic Heat Rate ◽  
Different Climates

Seventeen Eucalyptus species and 30 rapid-growing Eucalyptuscamaldulensis trees (referred to as plus trees), growing in a plantation were studied to examine relationships among measured plant growth and respiratory parameters, geographical origins, and growth climate. The respiratory parameters measured at two different temperatures by isothermal calorimetry were metabolic heat rate, rate of CO2 production, and the ratio of heat rate to CO2 rate. Metabolic heat rate was also measured as a continuous function of temperature by differential scanning calorimetry in the range of 10 to 40 °C. Tree growth was measured as rates of height and stem volume growth. The values of respiratory and growth variables of Eucalyptus species are significantly correlated with latitude and altitude of origin of their seed sources. The maximum metabolic heat rate, the temperature of the maximum heat rate, the temperature coefficients of metabolic rate, and the temperatures at which the slopes of Arrhenius plots change are all genetically determined parameters that vary both within and among species. Measurement of growth rate–respiration rate–temperature relationships guide understanding of why relative growth rates of Eucalyptus species and individual genotypes differ with climate, making it possible to identify genotypes best suited for rapid growth in different climates. The temperature dependence of respiration rates is an important factor determining relative growth rates of eucalypts in different climates. To achieve optimum biomass production the temperature dependence of individual plants must be matched to growth climate.

Studies on the sowing dates of cotton in the Sudan Gezira: I. The influence of date of sowing on plant growth and development

1967 ◽  
Vol 69 (3) ◽  
pp. 305-315 ◽  
Author(s):  
J. E. Jackson
Keyword(s):  
Growth Rates ◽  
Slow Growth ◽  
Seasonal Pattern ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Research Division ◽  
Sowing Dates ◽  
Net Assimilation ◽  
State Growth ◽  
Sudan Gezira

Growth analysis of cotton crops sown in the Sudan Gezira at monthly intervals between August and May revealed a marked seasonal pattern of growth. Irrespective of plant age and fruiting state growth of non-senescent plants was slowest during the cool winter months. Relative growth rates of young plants were highest in August, September and early October due to the high specific leaf areas and fairly high net assimilation rates found then. They were lowest when minimum temperatures were lowest. Net assimilation rates were also lowest in the coolest months, probably as a result of restricted growth. High temperatures in the spring reduced fruiting. It is concluded that low minimum temperatures and high evaporation rates are both associated with slow growth, and play a large part in determining the characteristic decline of growth rates of cotton sown at the usual date in August.I wish to thank the Chief of the Research Division, Ministry of Agriculture, Sudan, for permission to publish this paper and to record my gratitude to the team of field and laboratory assistants, especially Salih Saad and Hassan Osman, who helped in the work.

The effect of barley yellow dwarf virus on early plant growth in ryegrass (Lolium spp.)

1989 ◽  
Vol 40 (2) ◽  
pp. 293 ◽  
Author(s):  
DR Eagling ◽  
RJ Sward ◽  
GM Halloran
Keyword(s):  
Leaf Area ◽  
Growth Rates ◽  
Barley Yellow Dwarf Virus ◽  
Dry Weight ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Root Dry Weight ◽  
Shoot Dry Weight ◽  
Barley Yellow Dwarf ◽  
Yellow Dwarf Virus

Measurements were made on the effect of barley yellow dwarf virus (BYDV) infection on the early growth of four commercial cultivars of ryegrass (Lolium spp.) under two different temperatures (24�C and 16�C). At 24'C, BYDV infection was associated with reduced root dry weight (30-40%) in all cultivars; the effect of infection on shoot dry weight and leaf area was variable. At 16�C, the effect of BYDV infection was variable, being associated with increases in root dry weight, shoot dry weight, and leaf area in one cultivar (Grasslands Ariki) and decreases in another (Victorian). In two other cultivars, root dry weight, shoot dry weight and leaf area were not significantly affected (P>0.05) by infection with BYDV.At 24�C, the reductions in root dry weight associated with BYDV infection were not concomitant with reductions in the root relative growth rates. Up to at least 28 days after inoculation (46-50 days after germination) reductions in root dry weight were associated with both aphid-feeding damage and virus infection. Experiments with the cultivar Victorian, showed that shoot dry weight was not significantly affected (P>0.05) by feeding with viruliferous (BYDV) or non-viruliferous aphids (Rhopalosiphum padi L.). At 16�C, changes in root and shoot dry weight were associated with changes in the root and shoot relative growth rates.

Relative growth rates

1990 ◽  
pp. 25-34 ◽  
Author(s):  
Roderick Hunt
Keyword(s):  
Growth Rates ◽  
Relative Growth ◽  
Relative Growth Rates

The Relative Growth of Parts in Palaemon Carcinus

1930 ◽  
Vol 7 (2) ◽  
pp. 165-174
Author(s):  
M. A. TAZELAAR
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Linear Measurements ◽  
Relative Growth ◽  
Male And Female ◽  
Relative Growth Rates ◽  
Rate Of Growth ◽  
The Difference ◽  
Rates Of Growth

Linear measurements of certain appendages and the carapace of P. carcinus were made and plotted in various ways. The following conclusions were drawn: 1. The cheliped shows heterogonic growth in both male and female, but more markedly in the male, the values of k being: male 1.8 and female 1.48 2. The pereiopods in both male and female are slightly heterogonic. The relative growth rates are graded from p3 to p5, that of p3 being slightly greater than that of p5 3. Of the ordinary pereiopods the rate of growth of p1 is the smallest in the male, but the largest in the female. 4. The difference between the rates of growth of p1 and p3 in male and female is greatest where the rate of growth in the heterogonic organ, the cheliped, is most excessive in the male. 5. The growth of the 3rd maxilliped is slightly negatively heterogonic, the value of k in the male being 0.93 and in the female 0.95. Hence there seems to be a correlation between the marked heterogony in the cheliped on the growth rate of neighbouring appendages. In those immediately posterior to the cheliped the growth rate is increased and in those anterior decreased.

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