Plant Growth Analysis: The Variability of Relative Growth Rate Within a Sample

1991 ◽  
Vol 67 (2) ◽  
pp. 137-144 ◽  
Author(s):  
D. R. CAUSTON
Keyword(s):  
Growth Rate ◽  
Plant Growth ◽  
Relative Growth Rate ◽  
Growth Analysis ◽  
Relative Growth

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.

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.

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 Karakter Morfo-fisiologi dan Hasil Padi Gogo Toleran Kekeringan

2020 ◽  
Vol 25 (3) ◽  
pp. 462-467
Author(s):  
Yugi Rahayu Ahadiyat ◽  
Sapto Nugroho Hadi ◽  
Okti Herliana
Keyword(s):  
Growth Rate ◽  
Plant Growth ◽  
Relative Growth Rate ◽  
Root Length ◽  
Yield Components ◽  
Upland Rice ◽  
Morphological Characters ◽  
Relative Growth ◽  
Panicle Number ◽  
Physiological Characters

The objective of this study was to obtain varieties with high yield along with proper morpho-physiological characters under drought condition. Eleven varieties of upland rice i.e., Gilirang, Situ Patenggang, Kalimutu, Aek Sibundong, Batutegi, Towuti, Sunggal, Danau Gaung, Way Apo Buru, Danau Tempe, and Situ Bagendit were characterized based on morphology, physiology, and yield. Non factorial Complete Randomized Block Design was used with three times repetition. Parameters measured were morphological characters, physiological characters, and yield components. Morphological characters measured were plant height, number and area of leaf, shoot dry biomass, tiller number, and total root length. Physiological characters measured were plant growth rate, net assimilation rate, and relative growth rate. Yield components measured were number and length of panicle, number of seeds per panicle, 1000 seeds weight, weights of seed per panicle, weights of seed per plot, and weights of seed per hectare. The results showed that Danau Tempe variety had better characters against drought stress compared to the other varieties with higher yields supported by high plant growth rate, relative growth rate, chlorophyll content and leaf area with low accumulation of proline content and short root length.   Keywords: drought, morphological character, upland rice variety, yield

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 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 Analysis of Plant Growth and Yield in Varieties of Tomato (Solanum lycopersicum L.) Grafted onto Different Eggplant Rootstocks

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Evy Latifah ◽  
Amik Krismawati ◽  
Mohammad Saeri ◽  
Zainal Arifin ◽  
Bas Warsiati ◽  
...  
Keyword(s):  
Growth Rate ◽  
Plant Growth ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Net Assimilation Rate ◽  
Growth And Yield ◽  
Assimilation Rate ◽  
Relative Growth ◽  
Tomato Plants ◽  
Net Assimilation

This study aimed to examine plant growth of tomato grafted onto different eggplant rootstocks. We applied a randomized block design comprising twelve treatments with three replicates. Three varieties of tomato—Cervo, Karina, and Timoty—and three rootstocks—Gelatik, EG203 line, and Solanum torvum—were selected for this study. Nongrafted tomato plants of the same varieties were used as controls. The variables recorded were the number of branches, the diameter of scions and rootstocks, root length, and root dry weight at 4, 6, 8, and 10 weeks after planting (WAT) and relative growth rate, specific leaf area, and net assimilation rate at 4, 8, and 12 WAT. Grafted tomato plants demonstrated better growth than controls. There was a significant relationship between yield, plant growth parameters, and photosynthetic organs, expressed by higher production, greater scion diameter, longer roots, and increased relative growth rate, leaf area ratio, and net assimilation rate of grafted plants, compared to the controls.

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