scholarly journals Error estimation in plant growth analysis

2014 ◽  
Vol 65 (3-4) ◽  
pp. 207-212 ◽  
Author(s):  
Andrzej Gregorczyk
Keyword(s):  
Growth Rate ◽  
Plant Growth ◽  
Growth Analysis ◽  
Growth Curves ◽  
Logistic Function ◽  
Relative Growth ◽  
Unit Leaf ◽  
Joint Application ◽  
Richards Function ◽  
Maize Plants

The scheme is presented for calculation of errors of dry matter values which occur during approximation of data with growth curves, determined by the analytical method (logistic function) and by the numerical method (Richards function). Further formulae are shown, which describe absolute errors of growth characteristics: Growth rate (GR), Relative growth rate (RGR), Unit leaf rate (ULR) and Leaf area ratio (LAR). Calculation examples concerning the growth course of oats and maize plants are given. The critical analysis of the estimation of obtained results has been done. The purposefulness of joint application of statistical methods and error calculus in plant growth analysis has been ascertained.

scholarly journals ANÁLISE DE CRESCIMENTO DO MILHO SAFRINHA EM DIFERENTES ÉPOCAS DE APLICAÇÃO DE ZINCO

Nativa ◽  
2018 ◽  
Vol 6 (6) ◽  
pp. 557
Author(s):  
Flávio Henrique Ferreira Gomes ◽  
Fernando Nobre Cunha ◽  
Luiz Cesar Lopes Filho ◽  
Frederico Antonio Loureiro Soares ◽  
Marconi Batista Teixeira ◽  
...  
Keyword(s):  
Growth Rate ◽  
Plant Growth ◽  
Growth Analysis ◽  
Growth Parameters ◽  
Time Interval ◽  
Relative Growth ◽  
Agronomic Practices ◽  
Absolute Growth ◽  
Physiological Indexes ◽  
Culture Growth

O método de análise de crescimento de plantas é utilizado na avaliação de seu comportamento quando submetidas a práticas agronômicas. Os valores do intervalo de tempo e biomassa permitem a realização de estimativas relacionado ao crescimento de plantas.  Objetivou-se, neste trabalho, avaliar a influência das épocas de aplicação de zinco para os índices fisiológicos na cultura do milho safrinha. O delineamento experimental utilizado foi o de blocos ao acaso em esquema de parcelas subdividas 4x5, com quatro repetições, as parcelas foram compostas por quatro épocas de aplicações (36, 43, 50 e 57 dias após o plantio) e as subparcelas 5 épocas de avaliações (60, 75, 90, 105 e 120 dias após o plantio). Os parâmetros da análise de crescimento analisados foram taxa de crescimento da cultura (TCC), taxa de crescimento relativo (TCR), razão de massa foliar (RMF) e taxa de crescimento absoluto (TCA). Para a cultura do milho, a interação entre os fatores Épocas de Aplicação e Épocas de Avaliação (EAp x EAv) foi significativa para todas variáveis analisadas. As épocas de aplicação aos 36 e 43 dias após o plantio, obtiveram os melhores parâmetros de crescimento para cultura do milho safrinha.Palavras-chave: índices fisiológicos, épocas de avaliação, comportamento, massa da matéria seca. OFF-SEASON MAIZE GROWTH ANALYSIS IN DIFFERENT PERIODS OF ZINC APPLICATION ABSTRACT: The plant growth analysis method is used in evaluating its behavior when subjected to agronomic practices. The values of the time interval and biomass allow the realization of estimates related to plant growth. In this work, we aimed at evaluating the influence of zinc-applying periods for physiological indices in the culture of off-season maize. The experimental design used was random blocks in plots subdivided in 4x5, with four replications, the plots were composed by four periods of applications (36, 43, 50 and 57 days after planting) and subplots by 5 evaluations periods (60, 75, 90, 105 and 120 days after planting). The analyzed growth analysis parameters were culture growth rate (TCC), relative growth rate (TCR), leaf mass ratio (RMF) and absolute growth rate (TCA). For maize culture, the interaction between factors four periods of applications and evaluations periods (EAp x EAv) was significant for all variables analyzed. The periods of application at 36 and 43 days after planting, obtained the best growth parameters for the crop of off-season maize.Keywords: physiological indexes, periods of evaluation, behavior, mass of dry matter.

scholarly journals Growth Analysis of Tomatoes Grown in Black Polyethylene and Hairy Vetch Mulches

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 810D-810
Author(s):  
John R. Teasdale ◽  
Aref A. Abdul-Baki ◽  
William J.E. Potts
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Growth Analysis ◽  
Weight Ratio ◽  
Dry Weight ◽  
Hairy Vetch ◽  
Vicia Villosa ◽  
Relative Growth ◽  
Tomato Plants ◽  
Unit Leaf

Dry weight and leaf area of tomato (Lycopersicon esculentum Mill.) plants grown on raised beds with black polyethylene (BP) or hairy vetch (Vicia villosa Roth) (HV) mulches were measured at weekly intervals during 1993 and 1994. Leaf area and foliage, fruit, and total weight of tomato plants grown in BP were greater early in the season, but less later in the season than plants grown in HV. The relative growth rate of tomatoes in HV was higher throughout most of each year than that in BP. There was little difference between treatments in unit leaf rate (rate of weight gain per unit leaf area). The growth rate of fruit per unit of tomato foliage was greater in BP than HV, whereas the leaf area to weight ratio was greater in HV than BP. These results suggest that tomatoes grown in BP produce greater early yield because of greater early foliage growth and greater partitioning to fruit than HV. However, tomatoes grown in HV eventually outgrow and outyield those in BP because of greater partitioning to and maintenance of leaf area throughout the season.

scholarly journals Azolla a Boon for the Growth of Gift Tilapia, Oreochromis Niloticus (Linnaeus, 1758)

2021 ◽  
Author(s):  
LEENA GRACE BESLIN ◽  
MONISHA RAJAN
Keyword(s):  
Growth Rate ◽  
Growth Analysis ◽  
Specific Growth ◽  
Condition Factor ◽  
Control Diet ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Feed Conversion ◽  
Relative Growth ◽  
Gift Tilapia

Abstract Appreciative dietary desires and fabrication of fish nourishment is vital to the progress, sustainability of aquaculture and for the advanced feed mill rehearsal. Organizing fish feed includes choosing the exact feed, using an acceptable feeding technique, work out the feed charge and ensuring the cost efficiency of fish farm. The purpose of our present study was to feed the fishes with four different feeds and assessment of growth performance by length weight relationships. The growth analysis was executed by measuring FCR and related indices in gift tilapia oreochromis niloticus. Four feed composition was selected without any chemical contamination. In the present study fishes were collected from the golden farm, Neyyattinkara, Thiruvananthapuram district, South India. Fishes were introduced into four different tanks of well oxygenated good quality water. In each experimental tank, 20 fishes were introduced. For each experimental container a specific feed was fixed from 4 different diets. Every day feed was given to the fishes. They were fed two times for the period of 3 months. They were maintained to assess their growth performance. Four types of feeds used for the present study were control diet, diet 1, diet 2 and diet 3. Length and weight were measured on every 15 days interval for growth estimation. Based on the length-weight data, growth analysis was carried out by calculating relative growth (RG), relative growth rate (RGR), specific growth rate (SGR), feed conversion ratio (FCR) and the Fulton’s condition factor. The results of mean length in diet3proved the highest length of 6.455±0.46cm and diet one contain lowest length of 5.03±0.68cm. Highest weight of 96.8 ± 0.37g was recorded in diet3 and lowest weight obtained for the control diet (3.645 ± 0.306 g). In growth analysis the relative growth of fish was estimated in diet 3 having high relative growth (11.91). Relative growth rate was elevated in diet 3(1.5597). The upper limit of specific growth rate was 1.9146% noticed in diet 3. The feed conversion ratio was maximum in diet 3 (58.06) and minimum in control diet (36). The highest k value in Fulton's condition factor was noticed in diet 3(88.32).All experimental results proved that live Azolla [D3] was a superior feed for the present trials.

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.

Plant Growth Curves-the Functional Approach to Plant Growth Analysis.

Biometrics ◽  
1983 ◽  
Vol 39 (2) ◽  
pp. 537
Author(s):  
C. A. Glasbey ◽  
R. Hunt
Keyword(s):  
Plant Growth ◽  
Growth Analysis ◽  
Growth Curves ◽  
Functional Approach

Water Relations of Beans I. Effects of Water Stress on Growth and Flowering

1969 ◽  
Vol 5 (3) ◽  
pp. 195-207 ◽  
Author(s):  
A. H. El Nadi
Keyword(s):  
Growth Rate ◽  
High Temperature ◽  
Water Stress ◽  
Plant Growth ◽  
Relative Growth Rate ◽  
Broad Bean ◽  
Day Length ◽  
Vegetative Period ◽  
Relative Growth ◽  
Made In

SummaryExperiments were made in glasshouses, growth cabinets and growth rooms to study the differential responses of the broad bean to water stress during the vegetative and flowering phases of growth. Plants in the flowering phase proved to be more sensitive to drought than in the vegetative period, and there were different responses (Relative Growth Rate) to temperature at different stages of plant growth. Day length and temperature influenced the position of the earliest flower initials on the stem, and intensity of flower shedding was aggravated by high temperature.

Growth responses of six bryophyte species to different light intensities

1993 ◽  
Vol 71 (5) ◽  
pp. 661-665 ◽  
Author(s):  
Emmanuel Rincón
Keyword(s):  
Growth Rate ◽  
Light Intensity ◽  
Growth Rates ◽  
Growth Analysis ◽  
Total Chlorophyll ◽  
Light Conditions ◽  
Growth Responses ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Plastic Responses

The growth responses of Brachythecium rutabulum, Eurhynchium praelongum, Lophocolea bidentata, Plagiomnium undulatum, Pseudoscleropodium purum, and Thuidiurn tamariscinum, growing under seven different light conditions, were determined in a 36-day laboratory experiment. Biomass production, relative growth rate, chlorophyll content, and morphological plastic responses (bending of the shoots) were determined following initial and final harvests. All species achieved greater biomass as irradiance increased. This trend was also observed in the relative growth rates, which were higher as irradiance increased, for all the bryophytes investigated. All species except L. bidentata showed an increased elevation of the shoot as irradiance decreased. Total chlorophyll was higher in all species at the lowest irradiance level, but no clear differences were observed in the ratios of chlorophyll a to b for all the species. Key words: grassland bryophytes, light intensity, growth analysis, plasticity.

scholarly journals The logistic function - its application to the description and prognosis of plant growth

2014 ◽  
Vol 60 (1-2) ◽  
pp. 67-76 ◽  
Author(s):  
Andrzej Gregorczyk
Keyword(s):  
Experimental Data ◽  
Growth Rate ◽  
Plant Growth ◽  
Dry Matter ◽  
Large Degree ◽  
Logistic Function ◽  
Transcendental Equation ◽  
Logistic Equations ◽  
Characteristic Points ◽  
Derivatives Of

A logistic function in the form of y=A/(1 +be<sup>-rt</sup>) was used in this paper to analyse the growth of plants. The first, second and third derivatives of the above equation served as the basis for constructing growth, growth rate and growth acceleration curves. Characteristic points showing the main phases of plant growth were also found on these curves. Very good results were obtained by using the logistic function to describe the accumulation of dry matter by a plant using experimental data from literature. An attempt was also made to forecast growth based on three initial measurements of dry matter. A transcendental equation, solvable by numerical methods, was derived from the three logistic equations. This method was not found to be useful in predicting the final growth due to the large degree of error between the experimental and estimated value.

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