scholarly journals 【Short Report】Grain Yield and Leaf Area Growth of Direct-Seeded Rice on Flooded and Aerobic Soils in Japan

2013 ◽  
Vol 16 (3) ◽  
pp. 276-279 ◽  
Author(s):  
Midori Okami ◽  
Yoichiro Kato ◽  
Junko Yamagishi
Keyword(s):  
Grain Yield ◽  
Leaf Area ◽  
Short Report ◽  
Area Growth ◽  
Direct Seeded ◽  
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 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 Response of Rice Genotypes to Weed Competition in Dry Direct-Seeded Rice in India

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Gulshan Mahajan ◽  
Mugalodi S. Ramesha ◽  
Bhagirath S. Chauhan
Keyword(s):  
Grain Yield ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Root Biomass ◽  
Early Stage ◽  
Weed Competition ◽  
Genotypic Differences ◽  
Area Index ◽  
Direct Seeded ◽  
Rice Genotypes

The differential weed-competitive abilities of eight rice genotypes and the traits that may confer such attributes were investigated under partial weedy and weed-free conditions in naturally occurring weed flora in dry direct-seeded rice during the rainy seasons of 2011 and 2012 at Ludhiana, Punjab, India. The results showed genotypic differences in competitiveness against weeds. In weed-free plots, grain yield varied from 6.6 to 8.9 t ha−1across different genotypes; it was lowest for PR-115 and highest for the hybrid H-97158. In partial weedy plots, grain yield and weed biomass at flowering varied from 3.6 to 6.7 t ha−1and from 174 to 419 g m−2, respectively. In partial weedy plots, grain yield was lowest for PR-115 and highest for PR-120. Average yield loss due to weed competition ranged from 21 to 46% in different rice genotypes. The study showed that early canopy closure, high leaf area index at early stage, and high root biomass and volume correlated positively with competitiveness. This study suggests that some traits (root biomass, leaf area index, and shoot biomass at the early stage) could play an important role in conferring weed competitiveness and these traits can be explored for dry-seeded rice.

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

scholarly journals The relationship between leaf area growth and biomass accumulation in Arabidopsis thaliana

2015 ◽  
Vol 6 ◽  
Author(s):  
Sarathi M. Weraduwage ◽  
Jin Chen ◽  
Fransisca C. Anozie ◽  
Alejandro Morales ◽  
Sean E. Weise ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Leaf Area ◽  
Biomass Accumulation ◽  
Area Growth ◽  
Leaf Area Growth ◽  
The Relationship
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