scholarly journals Introducing Viewpoints of Mechanics into Basic Growth Analysis-(XI) : Negative Weight Problem in Basic Growth Functions and its Hypothetic Avoidance by Sign Reversal of Relative Growth Rate, Space Inversion and Time Reversal-

10.5109/16114 ◽  
2009 ◽  
Vol 54 (2) ◽  
pp. 353-355
Author(s):  
Masataka Shimojo ◽  
Tao Shao ◽  
Jun Tanoue ◽  
Hidetoshi Kakihara ◽  
Chiemi Sata ◽  
...  
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Time Reversal ◽  
Growth Analysis ◽  
Sign Reversal ◽  
Relative Growth ◽  
Negative Weight ◽  
Growth Functions ◽  
Weight Problem ◽  
Space Inversion

scholarly journals Growth Analysis of Wheat Using Machine Vision: Opportunities and Challenges

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6501
Author(s):  
Mohammad Ajlouni ◽  
Audrey Kruse ◽  
Jorge A. Condori-Apfata ◽  
Maria Valderrama Valencia ◽  
Chris Hoagland ◽  
...  
Keyword(s):  
Growth Rate ◽  
Machine Vision ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Growth Analysis ◽  
Growth Parameters ◽  
Dry Weight ◽  
Projected Area ◽  
Relative Growth ◽  
Leaf Dry Weight

Crop growth analysis is used for the assessment of crop yield potential and stress tolerance. Capturing continuous plant growth has been a goal since the early 20th century; however, this requires a large number of replicates and multiple destructive measurements. The use of machine vision techniques holds promise as a fast, reliable, and non-destructive method to analyze crop growth based on surrogates for plant traits and growth parameters. We used machine vision to infer plant size along with destructive measurements at multiple time points to analyze growth parameters of spring wheat genotypes. We measured side-projected area by machine vision and RGB imaging. Three traits, i.e., biomass (BIO), leaf dry weight (LDW), and leaf area (LA), were measured using low-throughput techniques. However, RGB imaging was used to produce side projected area (SPA) as the high throughput trait. Significant effects of time point and genotype on BIO, LDW, LA, and SPA were observed. SPA was a robust predictor of leaf area, leaf dry weight, and biomass. Relative growth rate estimated using SPA was a robust predictor of the relative growth rate measured using biomass and leaf dry weight. Large numbers of entries can be assessed by this method for genetic mapping projects to produce a continuous growth curve with fewer replicates.

Functional growth analysis of conifer seedling responses to competing vegetation

1993 ◽  
Vol 69 (1) ◽  
pp. 64-70 ◽  
Author(s):  
G. Blake MacDonald ◽  
G. F. Weetman
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Growth Analysis ◽  
Black Spruce ◽  
Jack Pine ◽  
Programmable Calculator ◽  
Relative Growth ◽  
Absolute Growth ◽  
The Absolute ◽  
Stock Types

A modification of functional growth analysis is proposed for investigating the responses of conifer seedlings to vegetative competition. The approach permits detailed comparisons of the absolute growth and relative growth rate with respect to competition level between crop species and between stock types. In this study, jack pine (Pinus banksiana Lamb.) demonstrated greater height and diameter growth than black spruce (Picea mariana (Mill.) B.S.P.) across the range of competition. However, competition had a larger negative impact on relative growth rate for jack pine. The absolute growth and relative growth rate were greater for bare root stock than for container stock, indicating that the effects of initial size differences between the stock types remained four years after planting. In all cases, the negative effect on seedling growth of each unit of competition diminished as the competition intensity increased.A practical application of functional growth analysis is suggested to assist free-to-grow assessments in plantations. The underlying functions would be developed separately for each ecological site type encountered, and would use root collar diameter increment to assess seedling potential. With the functions entered into a programmable calculator, field crews could rapidly obtain the required competition measurements, apply the functions, and make tending decisions. Key words: Relative growth rate, competition threshold, vegetation management, free-to-grow, plantation, tending, weeding, black spruce, jack pine

scholarly journals RESPONS OF GROWTH ANALYSIS PARAMTERS OF SOME COTTON CULTIVARS TO INTEGRATED WEED MANAGEMENT

2016 ◽  
Vol 47 (1) ◽  
Author(s):  
Al-Chalabi & Hammood
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Growth Analysis ◽  
Crop Growth ◽  
Net Assimilation Rate ◽  
Assimilation Rate ◽  
Relative Growth ◽  
Crop Growth Rate ◽  
Crop Density ◽  
Net Assimilation

A field experiment was conducted at the experimental field, Department of Field Crop - College of  Agriculture Abu-Ghraib- University of Baghdad, during summer season at 2012 and 2013, to determine the response of  growth analysis parameters in some cotton cultivars to Integrated Weed Management. A randomized complete block design (RCBD) arranged according to split-plot was used with three replicates, included six weed control treatments as Main-plots where as Sub-plots included eight cotton cultivars. The results showed various to response of  growth analysis parameters to weed control treatments , the treatment of weedfree with normal crop density of 106667 plant.h-1 and high crop density of 200000 plant.h-1 during 70 -90 days after sowing achieved highest crop growth rate of 10.80 , 9.87 g.m-2.day-1 at first season respectively and 9.81, 9.35 g.m-2.day-1 at second season respectively, and highest net assimilation rate of 1.668 , 1.208 mg.cm-2.day-1 at first season respectively, and 1.504 , 1.004 mg.cm-2. day-1 at second season respectively, highest relative growth rate of  50.48 , 48.52 mg.g-1. day-1 at first season respectively, and 38.49 , 37.78 mg.g-1.day-1 at second  season respectively , Has cultivar in first season and Marsomi-1 cultivar in second season achieved  highest crop growth rate of 9.62 , 9.03 g.m-2.day-1 respectively, highest net assimilation rate of 1.399 ,1.188 mg.cm-2.day-1 respectively, Abu-Ghraib5 cultivar achieved highest relative growth rate of  57.19 , 44.66 mg.g-1.day-1 at both season respectively. The treatment of half rate of trifluraline 1.2 L.h-1 applied with high crop density with Has cultivar achieved  highest crop growth rate of  9.29 g.m-2.day-1 at first season, and with Marsomi-1 cultivar of  9.92 g.m-2. day-1 at second season, and highest net assimilation rate with Has cultivar of 1.163 , 1.040 mg.cm-2. day-1  at both season respectively, highest relative growth rate with Cocker 310 cultivar of  36.17 , 39.14 mg.g-1.day-1  at both season respectively, this results confirmed the integrated among cultivars, herbicides, and high crop density to improve this characters .

Growth relationships in silver maple seedlings fumigated with O3 and SO2

1983 ◽  
Vol 13 (2) ◽  
pp. 298-302 ◽  
Author(s):  
K. F. Jensen
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Growth Analysis ◽  
Dry Weight ◽  
Ozone Treatment ◽  
Dry Matter Accumulation ◽  
Relative Growth ◽  
Silver Maple ◽  
The Impact

Growth analysis was used to measure the impact of low levels of ozone, alone and with sulfur dioxide, on the growth of silver maple (Acersaccharinum L.) seedlings. The seedlings were fumigated for up to 60 consecutive days with cither 0.05, 0.1, or 0.2 ppm ozone, alone and with 0.1 ppm SO2 for 12 h per day. Dry weight and leaf area development curves were calculated from data collected at 10-day intervals throughout the study. Growth analysis variables were calculated from these curves. Three variables, relative growth rate, relative leaf area growth rate, and relative leaf weight growth rate, were reduced by 0.2 ppm ozone and decreased even further when 0.1 ppm SO2 was applied. Neither the 0.05 nor 0.1 ppm ozone treatment decreased the relative growth rate of the silver maple seedlings. Even small differences in growth rate may produce large differences in dry matter accumulation over a growing season.

scholarly journals Analytical growth equations and their Genstat 5 equivalents

1999 ◽  
Vol 47 (1) ◽  
pp. 67-89
Author(s):  
M. Heinen
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Growth Models ◽  
Single Equation ◽  
Exponential Polynomial ◽  
Relative Growth ◽  
Growth Functions ◽  
Growth Equations ◽  
Robust Parameter ◽  
Using Data

Two ways of representing some of the existing growth functions, (the exponential, the monomolecular or Mitscherlich, the logistic or autocatalytic, the Gompertz, and the Richards equations) are compared. In the first, growth is expressed in the parameters mass at time zero W0, mass at time infinity Wf, and a measure for the relative growth rate k. In the second, different parameters are used because of robust parameter optimization (e.g., by the statistical software package Genstat). The relationships between these fitted parameters and the parameters W0, Wf and k are demonstrated. The properties of these models, such as physical meaning of the parameters, properties at the point of inflection (if it exists), and the growth rate at a limit W -> 0, are examined. The second order exponential polynomial was rewritten in such a way that use was made of a proportionality constant, equal to the relative growth rate at the point of inflection. Application of the growth models is demonstrated using data for lettuce grown in a nutrient film system. Finally, it is shown that, except for the exponential polynomial, all growth equations originate from one single equation.

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