scholarly journals Seasonal variation and modeling of leaf area growth in Jatropha curcas L. plants: Implication for understanding the species adaptation in the Sahel of Niger

2020 ◽  
Vol 14 (6) ◽  
pp. 205-212
Author(s):  
Massaoudou Moussa ◽  
Abasse Tougiani ◽  
Rabiou Habou ◽  
Mahamane Larwanou
Keyword(s):  
Seasonal Variation ◽  
Leaf Area ◽  
Jatropha Curcas ◽  
Jatropha Curcas L ◽  
Area Growth ◽  
Leaf Area Growth

Effect of local stand structure on leaf area, growth, and growth efficiency following thinning of white spruce

2016 ◽  
Vol 368 ◽  
pp. 55-62 ◽  
Author(s):  
Kwadwo Omari ◽  
David A. MacLean ◽  
Michael B. Lavigne ◽  
John A. Kershaw ◽  
Greg W. Adams
Keyword(s):  
Leaf Area ◽  
Stand Structure ◽  
White Spruce ◽  
Growth Efficiency ◽  
Area Growth ◽  
Leaf Area Growth

scholarly journals Effects of gamma rays on germination and growth in Jatropha curcas L.

2015 ◽  
Vol 7 (2) ◽  
pp. 964-969 ◽  
Author(s):  
Dileswar Nayak ◽  
N. S. Patil ◽  
L. K. Behera ◽  
D. B. Jadeja
Keyword(s):  
Leaf Area ◽  
Gamma Rays ◽  
Jatropha Curcas ◽  
Seedling Survival ◽  
Germination Percentage ◽  
Shoot Length ◽  
Growth And Yield ◽  
Jatropha Curcas L ◽  
Number Of Leaves ◽  
Collar Diameter

The present investigation was carried out at the Forestry Research Farm, Navsari Agricultural University; Navsari to evaluate the gamma rays at 10 kR, 20 kR and 30 kR induced variability in Jatropha curcas L. on germination, growth and yield for seven Jatropha genotypes (Phule J-1, Urlikanchan, Hansraj, SKN Big, Chhatrapati, Hansot and MPJ-55). The significantly maximum germination percentage (66.96%), seedling survival (74.18%), seedling collar diameter (0.958cm), shoot length (49.442cm), number of leaves per seedling (7.757) and leaf area (37. 58)was observed in Chhatrapati genotype during nursery stage. While low rate of gamma rays treatment (10 kR) had stimulatory effect for germination percentage, seedling survival, seedling collar diameter, shoot length, number of leaves per seedling and leaf area. However, higher gamma rays doses (30 kR) drastically reduced all studied characters. The interaction effect of genotype and gamma rays were significant for number of leaves per seedling. Further, it was not significant in other traits like germination percentage, seedling survival, seedling collar diameter, shoot length and leaf area.

scholarly journals Application of the Richards function to the description of leaf area growth in maize (Zea mays L.)

2014 ◽  
Vol 63 (1) ◽  
pp. 5-7 ◽  
Author(s):  
Andrzej Grzegorczyk
Keyword(s):  
Zea Mays ◽  
Leaf Area ◽  
Nonlinear Regression ◽  
Growth Process ◽  
Zea Mays L ◽  
Logistic Function ◽  
Area Growth ◽  
Richards Function ◽  
Constant Coefficients ◽  
Leaf Area Growth

The leaf area growth in maize was approximated basing on the Richards function in the form of: y=A[l+b exp(-kt)]<sup>1/(1-m)</sup> . The constant coefficients of the Richards function were found by means of the Marquardt's method. The initial values of parameters were given basing on results of the preliminary approximation of the growth process by means of logistic function y = A[l+b exp(-kt)]<sup>-1</sup>. The procedure of nonlinear regression was found to be useful (curvilinear determination coefficient R<sup>2</sup> = 0.995). The Richards curve precisely describes the course of changes of the leaf area in maize since sprouting to a tassel flowering phase.

scholarly journals Growth of Jatropha curcas L. fertilized with nitrogen and potassium under conditions of dry tropical forest of Colombia

2017 ◽  
Vol 35 (2) ◽  
pp. 223-231
Author(s):  
Omar Montenegro R. ◽  
Stanislav Magnitskiy ◽  
Liz Patricia Moreno ◽  
Aquiles Enrique Darghan
Keyword(s):  
Growth Rate ◽  
Tropical Forest ◽  
Leaf Area ◽  
Jatropha Curcas ◽  
Fertilizer Application ◽  
Area Index ◽  
Dry Tropical Forest ◽  
Jatropha Curcas L ◽  
Reproductive Phase ◽  
Net Assimilation

Due to the demand in biofuel, the plant species that are not eatable and do not compete with traditional crops in Colombia, such as Jatropha curcas L., have become an important option. To produce more knowledge on the growth of this species, the research was carried out with different amounts of N and K fertilizers applied during the first 435 days after sowing (das) under dry tropical forest conditions. With the highest N dose (150 kg ha-1), the largest leaf area index was obtained in all evaluation period. The highest net assimilation rate (NAR) values were seen in the treatment with 150 kg ha-1 of N at 75 das, 1.852 g m-2 d-1, with no differences presented among the treatments with fertilizer application. The highest absolute growth rate (AGR) was observed when 150 kg ha-1 of N+180 kg ha-1of K2O were applied at the start of the reproductive phase (345 das), 24.5 g d-1. The specific leaf area (SLA) did not present a response to the treatments. The relative growth rate (RGR) reached zero value at 402 das for the plants without fertilizers. The accumulation of biomass in J. curcas was influenced by the fertilizers with N and K, presenting rapid initial vegetative growth (first 165 das) which decreased with the starting of the reproductive phase.

scholarly journals Interacting effects of soil fertility and atmospheric CO2 on leaf area growth and carbon gain physiology in Populus x euramericana (Dode) Guinier

1995 ◽  
Vol 129 (2) ◽  
pp. 253-263 ◽  
Author(s):  
PETER S. CURTIS ◽  
CHRISTOPH S. VOGEL ◽  
KURT S. PREGITZER ◽  
DONALD R. ZAK ◽  
JAMES A. TEERI
Keyword(s):  
Soil Fertility ◽  
Leaf Area ◽  
Atmospheric Co2 ◽  
Carbon Gain ◽  
Area Growth ◽  
Leaf Area Growth ◽  
Populus X Euramericana

The influence of low soil temperature on the growth of vesicular–arbuscular mycorrhizal Fraxinuspennsylvanica

1987 ◽  
Vol 17 (8) ◽  
pp. 951-956 ◽  
Author(s):  
C. P. Andersen ◽  
E. I. Sucoff ◽  
R. K. Dixon
Keyword(s):  
Leaf Area ◽  
Growth Rates ◽  
Root Zone ◽  
Arbuscular Mycorrhizal ◽  
Green Ash ◽  
P Content ◽  
Vesicular Arbuscular ◽  
Area Growth ◽  
Leaf Area Growth ◽  
Leaf P

Green ash (Fraxinuspennsylvanica Marsh.) seedlings were either inoculated with Glomusetunicatum or not inoculated and grown for approximately 5 weeks under glasshouse conditions to permit root colonization with vesicular–arbuscular (V–A) mycorrhizae. Two experiments were conducted to characterize V–A mycorrhizae influence on seedling growth at low root temperature. In experiment 1, seedlings were subjected to four root zone temperatures ranging from 7.5 to 20 °C for 24 days to measure leaf area and plant height on intact seedlings. In experiment 2, seedlings were exposed to root temperatures of 12.0, 16.0, and 20.0 °C for 30 days and seedlings were destructively harvested at 6-day intervals to measure growth variables and biomass distribution. Results of experiments 1 and 2 were similar. In experiment 1, leaf area growth of mycorrhizal seedlings was significantly greater than nonmycorrhizal controls at all temperatures. Relative leaf area growth rate was greater in mycorrhizal than nonmycorrhizal seedlings at 7.5 and 11.5 °C, similar between treatments at 15.5 °C, and greater in nonmycorrhizal seedlings at 20.0 °C, differences possibly resulting from the larger size of mycorrhizal seedlings at the start of the temperature treatments. In experiment 2, temperature treatments were imposed on seedlings of the same size. Mycorrhizal seedlings had greater leaf area growth rates and relative leaf area growth rates than nonmycorrhizal seedlings at all temperatures. Phosphorus concentrations and total P content in roots and leaves did not differ significantly between mycorrhizal treatments at any temperature; however, mycorrhizal seedlings had consistently greater leaf P content than nonmycorrhizal controls. Glomusetunicatum actively stimulates green ash growth at moderately low root temperatures.

AN ESTIMATION EQUATION FOR SQUASH LEAF AREA USING LEAF MEASUREMENTS

1986 ◽  
Vol 66 (3) ◽  
pp. 677-682 ◽  
Author(s):  
W. S. FARGO ◽  
E. L. BONJOUR ◽  
T. L. WAGNER
Keyword(s):  
Host Plant ◽  
Leaf Area ◽  
Cucurbita Pepo ◽  
Leaf Expansion ◽  
Individual Leaf ◽  
Area Growth ◽  
Area Increase ◽  
Total Plant ◽  
Leaf Area Growth ◽  
Growth Development

An equation was developed which may be used to estimate the area of all sizes of developing squash (Cucurbita pepo L.) leaves. The equation uses two leaf measurements (midrib length (ML) and the distance between tertiary lobes (TD)) which may be taken quickly in the laboratory or field without disturbing the host plant. The equation is:[Formula: see text]The equation is applicable in monitoring individual leaf expansion as well as total plant leaf area increase and in examining the dynamics of the plant under various environmental conditions.Key words: Cucurbita pepo L., leaf area, growth, development, leaf expansion

Sign in / Sign up

Export Citation Format

Share Document