A METHOD FOR ASSESSING LEAF AREA

1982 ◽  
Vol 62 (1) ◽  
pp. 211-214 ◽  
Author(s):  
W. G. BAILEY ◽  
R. B. STEWART
Keyword(s):  
Leaf Area ◽  
Dry Weight ◽  
Image Analyzer ◽  
Photographic Technique ◽  
The Relationship

A photographic technique is described for evaluating leaf area employing an image analyzer. Use of this technique is illustrated in the determination of the relationship between leaf area and dry weight.

scholarly journals Determination of leaf area coefficient in sunflower.

1977 ◽  
Vol 25 (4) ◽  
pp. 238-242
Author(s):  
A.S.R. Pereira
Keyword(s):  
Leaf Area ◽  
Yield Components ◽  
Plant Density ◽  
Photosynthetic Capacity ◽  
Leaf Position ◽  
Area Estimation ◽  
End Use ◽  
The Relationship

For studies on the relationship between photosynthetic capacity and yield components in sunflower a method for estimating leaf area was required. To this end use of the leaf area coefficient (LAC), i.e. the quotient area/(length X max. width), was evaluated. It was found that LAC may be a function of leaf position and plant density, depending on the cv. concerned. For the Russian cv. Armavirec, LAC was independent of leaf position and plant density. For the Rumanian hybrid HS 18, LAC was dependent on leaf position but not plant density. For the French hybrid INRA 4701, LAC depended on both leaf position and plant density, but even in this case, it was concluded that LAC can be a useful aid in leaf area estimation. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Water managed properties of apple and pear trees based on lysimeters

2011 ◽  
pp. 129-132
Author(s):  
Péter Riczu ◽  
Nikolett Szőllősi ◽  
János Tamás ◽  
József Zsembeli
Keyword(s):  
Leaf Area ◽  
Significant Proportion ◽  
Dry Weight ◽  
Fruit Trees ◽  
Leaf Length ◽  
Maximum Width ◽  
K Value ◽  
The One ◽  
Tree Leaf

A significant proportion of the aboveground green and dry weight of the plant is constituted by foliage. The canopy is an important factor of plant growth. On the one hand, the canopy absorbs solar energy, which is necessary for photosynthesis; on the other hand, it accumulates the nutrients absorbed by the roots, and most of the water-loss occurs through the foliage. The determination of the full canopy is not an easy target. In our research, we developed a measurement method to determine the leaf area. With the parameters of the examined tree (leaf length and maximum width) and the data of the ADC AM 100 leaf area scanner, we determined the k-value, with which we can easily and fast evaluate the leaf surface. Furthermore, we defined from the water balance of compensation lysimeters the cumulative transpiration of fruit trees and the efficiency of water use of trees. From the examined trees were made a 3D depiction, which show the shape, branching and the location of trees.

scholarly journals Rapid Determination of Nitrogen Status in Pansy

HortScience ◽  
2003 ◽  
Vol 38 (4) ◽  
pp. 537-541 ◽  
Author(s):  
James E. Altland ◽  
Charles H. Gilliam ◽  
Gary J. Keever ◽  
James H. Edwards ◽  
Jeff L. Sibley ◽  
...  
Keyword(s):  
Nitrate Concentration ◽  
Rapid Determination ◽  
Dry Weight ◽  
Foliar Nitrogen ◽  
N Deficiency ◽  
Highly Correlated ◽  
The Relationship ◽  
Spad Readings ◽  
N Status

Two experiments were conducted with pansy (Viola ×wittrockiana Gams `Bingo Yello') to determine the relationship between foliar nitrogen (% of dry weight) (FN) and either sap nitrate concentration (SN) in petioles or SPAD readings of foliage. FN was highly correlated to SN throughout both experiments (r = 0.80 to 0.91). FN was poorly correlated to SPAD readings early in both experiments (r = 0.54 to 0.65), but more highly correlated later when visual symptoms of N deficiency were apparent (r = 0.84 to 0.90). SN determined with the Cardy sap nitrate meter was a reliable predictor of FN in pansy, while SPAD readings were only reliable after symptoms of N deficiency were visually evident. FN can be predicted with SN using the following equation: log(SN) = 0.47*FN + 1.6 [r2 = 0.80, n = 132]. Growers and landscape professionals can use SN readings to predict FN levels in pansy, and thus rapidly and accurately diagnose the N status of their crop.

THE RELATIONSHIP BETWEEN PHOTOSYNTHETIC AREA AND GRAIN YIELD PER PLANT IN WHEAT

1967 ◽  
Vol 47 (4) ◽  
pp. 359-365 ◽  
Author(s):  
H. D. Voldeng ◽  
G. M. Simpson
Keyword(s):  
Grain Yield ◽  
Leaf Area ◽  
Flag Leaf ◽  
Correlation Coefficients ◽  
Dry Weight ◽  
Major Portion ◽  
The Relationship

Shading treatments with a high- and a low-yielding line of wheat indicated that the ear and flag leaf contributed the major portion of grain dry weight. Correlation coefficients calculated between flag-leaf area and grain yield, and ear area and grain yield, from tillers within seven lines of wheat ranged from + 0.54 to + 0.90. The combination of a large flag leaf plus a large ear area showed promise as an index for selecting higher yielding individuals from a mixture of genotypes.

The Relation Between Leaf Production and Wood Weight in First-Year Root Sprouts of Two Populus Clones

1972 ◽  
Vol 2 (2) ◽  
pp. 98-104 ◽  
Author(s):  
Philip R. Larson ◽  
J. G. Isebrands
Keyword(s):  
Leaf Area ◽  
Leaf Surface ◽  
Dry Weight ◽  
First Year ◽  
Leaf Production ◽  
Leaf Surface Area ◽  
Highly Correlated ◽  
The Relationship ◽  
Non Destructive ◽  
Leaf Dry Weight

The relationship between leaf production and wood production in two clones of Populus grown for 1 year under intensive culture was investigated. Wood weight at any one stem position was highly correlated with the cumulative leaf area above that position. About one-half the total stem weight was bark, but the bark/wood ratio decreased with increasing leaf area. Wood specific gravity in creased from stem top to stem base, with mid-stem values of about 0.35. Leaf surface area and leaf dry weight were highly correlated with leaf lamina length; the latter therefore provides an easily measured, non-destructive estimate of photosynthesizing leaf surface. Marked clonal differences existed in all parameters measured.

The Relationship Between Leaf Area and Leaf Dry Weight of Three Conifer Species Grown on Three Sources of Nitrogen

1972 ◽  
Vol 2 (3) ◽  
pp. 377-379 ◽  
Author(s):  
G. E. Mellor ◽  
E. B. Tregunna
Keyword(s):  
Linear Relationship ◽  
Leaf Area ◽  
Dry Weight ◽  
Douglas Fir ◽  
Western Hemlock ◽  
Conifer Species ◽  
Nitrogen Treatments ◽  
The Relationship ◽  
Different Sources ◽  
Leaf Dry Weight

Western hemlock, Douglas-fir and lodgepole pine were grown on three different sources of nitrogen. At 18 weeks the relationship between leaf area and leaf dry weight was determined for each species. A linear relationship was found between leaf area and leaf dry weight for all three species. Different nitrogen treatments had no effect on this relationship.

scholarly journals 494 Evaluation of Interior Performance of Six Cultivars of Aglaonema and Dieffenbachia

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 479D-479
Author(s):  
Jianjun Chen ◽  
Dennis B. McConnell ◽  
Svoboda V. Pennisi ◽  
Cynthia A. Robinson ◽  
Russell D. Caldwell
Keyword(s):  
Tissue Culture ◽  
Leaf Area ◽  
Unit Area ◽  
Growth Parameters ◽  
Dry Weight ◽  
Fresh Leaf ◽  
Quality Ratings ◽  
Leaf Variegation ◽  
Number Of Leaves

Tissue culture plugs of Aglaonema `Cory', `Maria', and `Silver Queen' and Dieffenbachia `Panther', `Snowflake', and `Sport Lynn' were potted singly in 15-cm pots and grown in a shaded greenhouse under a photosynthetic irradiance (PI) of 100 mmol·m–2·s–1. Eight months after potting, 27 plants of each cultivar were placed in nine interior evaluation rooms under three different PI levels (three rooms per level): 4, 8, and 16 mmol·m–2·s–1. In addition, three plants of each cultivar were maintained in the original greenhouse for the duration of the experiment. Number of leaves, plant height and width were monitored monthly. Recently matured leaves were removed at 3-month intervals for 9 months for determination of fresh and dry weight, leaf area, and percentage leaf variegation. Variegated leaf area was assessed using digitized leaf images. Interior PI levels affected growth parameters, but the degree of response was cultivar-dependent. Smallest leaves developed on plants grown under 4 mmol·m–2·s–1 and largest leaves developed under 16 mmol·m–2·s–1. Leaf area of Dieffenbachia `Sport Lynn' showed the greatest response and Aglaonema `Maria' the least response to PI levels. Percentage leaf variegation of Dieffenbachia `Snowflake' was least affected and Dieffenbachia `Sport Lynn' was most affected by PI levels. Fresh leaf weight of unit area decreased as PI levels decreased from 16 to 4 mmol·m–2·s–1, however, the decrease in unit area was most pronounced in cultivars that maintained the highest quality ratings. Based on the results of this study, Aglaonema `Maria' and Dieffenbachia `Snowflake' had the most satisfactory interior performance within their respective genera.

scholarly journals Evaluation of water balance in apple and pear trees

2010 ◽  
pp. 193-198
Author(s):  
János Tamás ◽  
József Zsembeli ◽  
Péter Riczu
Keyword(s):  
Water Balance ◽  
Leaf Area ◽  
Significant Proportion ◽  
Dry Weight ◽  
Leaf Length ◽  
Maximum Width ◽  
K Value ◽  
Pear Trees ◽  
Tree Leaf

A significant proportion of the aboveground green and dry weight of the plant constitutes the foliage. The canopy is an important factorof plant growth. On one hand the canopy absorbs the solar energy, which is necessary for the photosynthesis, on the other hand accumulatesthe absorbed nutrients by the roots, and the most of the water-loss happens through the foliages. The determination of the full canopy is notan easy target. In our research we developed a measurement method to determine the leaf area. With the parameters of the examined tree(leaf length and maximum width) and the data of ADC AM 100 leaf area scanner we determined the k-value, with which we can easily andfast evaluate the leaf surface. Furthermore we defined from the water balance of compensation lysimeters the cumulative transpiration offruit trees and the efficiency of water use of trees.

scholarly journals Efficiency of Nitrogen Assimilation in Tomato Seedlings as Affected by Nitrogen Regime and Photoperiod

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 776C-776
Author(s):  
Silvana Nicola ◽  
Luigi Basoccu ◽  
Salvino Leoni
Keyword(s):  
Nitrogen Assimilation ◽  
Maximum Level ◽  
Dry Weight ◽  
Limiting Factor ◽  
Tomato Seedlings ◽  
N Supply ◽  
N Concentration ◽  
Net Assimilation ◽  
The Relationship

Excessive nitrogen can be detrimental to transplant quality when supplied during the period of suboptimal photoperiod conditions. This investigation was made to determine the relationship between nitrogen and photoperiod on the growth rate of the transplants. The growth analysis included the determination of the net assimilation rate (NAR) and the nitrogen productivity (NP). `Camone' tomato (Lycopersicon esculentum Mill.) seedlings were grown in the greenhouse under two photoperiods 8 and 12 h) at a constant light intensity and fertilized with three different N concentrations (8, 15, and 30 mmol·liter–1) applied four times. Longer photoperiods enhanced plant growth by increasing the internode, LAR, SLA, and SWR. Root fresh weight, dry weight, stem dry matter, NAR, and RWR were minimal when 30 mmol·liter–1 N concentration was supplied, while LAR and SLA were at their maximum level. The interaction between N and photoperiod was significant. Increasing N supply during an 8-h photoperiod decreased growth. During a 12-h photoperiod, 15 mmol·liter–1 was the optimum N concentration for fresh growth and 8 mmol·liter–1 for shoot dry growth. The RGR had the lowest value, with 30 mmol·liter–1 N and 8-h photoperiod. PNC was highest when plants received 30 mmol·liter–1 N during an 8-h photoperiod, and when the plants received 15 and 30 mmol·liter–1 N during the 8-h photoperiod. LNC doubled in plants fertilized with 30 mmol·liter–1 N compared to those with 8 mmol·liter–1 when grown under a 12-h photoperiod. The NP was at the maximum in plants fertilized with 8 mmol·liter–1 N at the 12-h photoperiod. The lowest NP values occurred when plants were fertilized with 30 mmol·liter–1 N. When photoperiod is a limiting factor in growing seedlings, N supply must be limited to optimize the efficiency of its utilization by the plant.

Determination of Tensile Strength of Compacted Loess by Double Punch Test

2011 ◽  
Vol 194-196 ◽  
pp. 1176-1179 ◽  
Author(s):  
Xiao Jun Li ◽  
Ying Ran Liu ◽  
Li Hua Jiang ◽  
Yi Chuan Tang
Keyword(s):  
Tensile Strength ◽  
Water Content ◽  
Dry Weight ◽  
Brazilian Test ◽  
Punch Test ◽  
Weight Density ◽  
The Relationship ◽  
Water Contents ◽  
Compacted Loess

Through double punch test, the tensile strength of compacted loess is determined under different water contents and different dry densities, the relationship between tensile strength, water content and the dry weight density is discussed, and their relationship is established. Comparing with Brazilian test, it proved the feasibility of determining tensile strength of compacted loess with double punch tests.

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