scholarly journals SUFFICIENT NUMBER OF REPLICATES FOR ESTIMATION OF DISSIMILARITY MEASURES AMONG MAIZE CULTIVARS

2020 ◽  
Vol 19 ◽  
pp. 14
Author(s):  
ALBERTO ​CARGNELUTTI FILHO ◽  
MARCOS TOEBE
Keyword(s):  
Power Function ◽  
Coefficient Of Variation ◽  
Block Design ◽  
Dissimilarity Measure ◽  
Abscissa Axis ◽  
Dissimilarity Measures ◽  
Maize Cultivars ◽  
Randomized Block Design ◽  
Data Files ◽  
Independent Variable

The objective of this work was to determine the sufficient number of replicates for estimation of dissimilarity measures among maize cultivars. Data of five variables were used, which were evaluated in an experiment with 15 maize cultivars, in randomized block design with nine replicates. A number of 511 data files were formed, being 9, 36, 84, 126, 126, 84, 36, 9, and 1 obtained, respectively from 1, 2, 3, 4, 5, 6, 7, 8, and 9 replicates. Three dissimilarity matrices were determined between i and i’ cultivars containing, respectively, Euclidean, Manhattan, and Chebyshev distances. For each of the 105 distances between cultivars, in each dissimilarity measure, the power function was adjusted for the coefficient of variation of the (dependent variable) as a function of the number of replicates (independent variable), totaling 315 equations. For each equation, the abscissa axis value (Xs, sufficient number of replicates) was determined, corresponding to the maximum curvature point. With the increase of the number of replicates, there is an improvement in the accuracy of the estimates of dissimilarity measures among maize cultivars, however, the gains in precision decrease gradually. Six replicates are sufficient to estimate the dissimilarity measures among maize cultivars expressed by the Euclidean, Manhattan, and Chebyshev distances.

scholarly journals Sufficient number of experiments for the adaptability and stability analyses of maize using the Eberhart and Russell method

2018 ◽  
Vol 53 (6) ◽  
pp. 673-683
Author(s):  
Alberto Cargnelutti Filho ◽  
José Paulo Guadagnin
Keyword(s):  
Grain Yield ◽  
Power Function ◽  
Abscissa Axis ◽  
Yield Data ◽  
Stability Analyses ◽  
Maximum Curvature ◽  
Maize Cultivars ◽  
Dependent Variables ◽  
Data Files ◽  
Independent Variable

Abstract: The objective of this work was to determine the sufficient number of experiments (environments) for the adaptability and stability analyses of maize cultivars, using the Eberhart and Russell method. Grain yield data from 63 trials of maize cultivars from six groups of experiments were used. In each group, new data files were formed from all experiments (n), for the combinations of 3, 4, ..., n-1 experiments, totaling 10,381 files. Mean and estimates of the adaptability (b) and stability (S2d) parameters were obtained for each cultivar, in each file. A power function was adjusted for the amplitudes of b and S2d (dependent variables) in each cultivar, as a function of the number of experiments (independent variable), totaling 290 equations (145 cultivars × two dependent variables). For each equation, the value was determined on the abscissa axis (Xs, sufficient number of experiments), corresponding to the point of maximum curvature. The highest value among the 290 estimates of Xs, rounded up to the nearest integer, was assumed to be the sufficient number of experiments for the analyses. Seven experiments are sufficient to analyze the adaptability and stability of maize cultivars using the Eberhart and Russell method.

scholarly journals Número suficiente de repetições para análise de trilha em milho

2021 ◽  
Vol 43 ◽  
pp. e32
Author(s):  
Alberto Cargnelutti Filho ◽  
Marcos Toebe ◽  
Bruna Mendonça Alves ◽  
Ismael Mario Marcio Neu ◽  
Jéssica Andiara Kleinpaul
Keyword(s):  
Path Analysis ◽  
Agronomic Traits ◽  
Block Design ◽  
Correlation Coefficients ◽  
Parameter Estimates ◽  
Coefficient Estimates ◽  
Maize Cultivars ◽  
Randomized Block Design ◽  
Data Files ◽  
Quadratic Response

The number of replications is assumed to interfere in the estimates of the path analysis coefficients. Thus, the objective of this work was to determine the sufficient number of replications for the path analysis of traits in maize cultivars. An experiment was conducted with 15 maize cultivars in a complete randomized block design with nine replications, and seven variables were measured. Then, 511 data files (matrices) formed by all combinations of the nine replications were organized, in groups of 1, 2, 3, 4, 5, 6, 7, 8 and 9 replications. In each matrix, containing the averages of 15 cultivars for the seven variables, Pearson's linear correlation coefficients were estimated, the multicollinearity diagnostics and path analysis were performed and dispersion diagrams were constructed. The sufficient number of replications for the path analysis was determined from the parameter estimates of the quadratic response plateau model. With the replications number increases, the accuracy of the path analysis coefficient estimates improves, but the gains in accuracy gradually decrease. Six replications are sufficient to perform the path analysis of agronomic traits of maize cultivars and can be used as a reference for designing future experiments.

Assessment of genetic variability for quantitative characters in rice (Oryza sativa L.) under post flood situation in sali

2021 ◽  
Vol 58 (1) ◽  
pp. 43-48
Author(s):  
Dalibha Pathak ◽  
Umesh Ch. Kalita
Keyword(s):  
Grain Yield ◽  
Coefficient Of Variation ◽  
Quantitative Traits ◽  
Oryza Sativa L ◽  
Block Design ◽  
Genetic Advance ◽  
Spikelet Sterility ◽  
Rice Varieties ◽  
Randomized Block Design ◽  
Spikelets Per Panicle

Sixteen genotypes of rice (including one check) were evaluated on 18 quantitative traits during sali (August), 2018 in a randomized block design with three replications at Instruction cum Research Farm, Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat to study the nature and magnitude of variability, heritability and genetic advance under delayed sown condition. The analysis of variance for 18 quantitative traits revealed the presence of significant differences for grain yield and its component characters. The highest genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) was observed for chaffs per panicle followed by grains per panicle, spikelet sterility (%), spikelets per panicle, grain yield (kg/ha). A high heritability coupled with high genetic advance was observed for plant height (cm), spikelets per panicle, spikelet sterility (%), chaffs per panicle, grains per panicle, grain yield (g/hill), grain yield (kg/ha), biological yield (kg/ha), straw weight (kg/ha) and harvest index (%) indicating that selection might be effective for improvement of these characters under delayed sown condition with low input. From the findings of this investigation, one genotype viz., Gandhari emerged as the outstanding genotype which yielded 4170 kg/ha and could be directly used for cultivation in delayed sown situation with low inputs. Some other promising genotypes that yielded higher than the check Manoharsali under delayed sown condition were JR 29, JR 16, Basundhara and JR 60 and could be utilized as potential parental material in the hybridization programmes designed to develop suitable rice varieties for delayed sown situation.

EXPERIMENTAL ERRORS IN EGG PRODUCTION EXPERIMENTS

1957 ◽  
Vol 37 (2) ◽  
pp. 143-151 ◽  
Author(s):  
E. S. Merritt ◽  
J. R. Aitken ◽  
Irene J. Stewart
Keyword(s):  
Coefficient Of Variation ◽  
Relative Efficiency ◽  
Experimental Error ◽  
Egg Production ◽  
Sampling Error ◽  
Block Design ◽  
Experimental Designs ◽  
Randomized Block Design ◽  
Experimental Errors

Data from 14 egg production experiments, which had replicated pens and individual trapnest records, were analysed to obtain estimates of experimental error from which to determine pen effects. The experiments were all nutrition experiments and were conducted at four experimental stations.Analyses were carried out on both a hen-housed and survivor basis. For all experiments the sampling error (individuals) underestimated the experimental error (individuals + pens) by about 20 per cent on a hen-housed basis. On a survivor basis there was no evidence of pen effects, that is, the sampling error did not underestimate the experimental error.The coefficient of variation for all experiments was 40 per cent on a hen-housed basis and 25 per cent on a survivor basis.The relative efficiency of two experimental designs, randomized block and completely randomized, was calculated for 11 of the experiments (on a hen-housed basis only). With the exception of 2 experiments, there was an increased efficiency of up to 500 per cent in utilizing a randomized block design. The data further indicate that the increase in efficiency obtained with a randomized block design is much more marked when the blocks represent different houses than when the blocks consist of different locations within a house.

scholarly journals Estimating the development of landrace and improved maize cultivars as a function of air temperature

2016 ◽  
Vol 46 (10) ◽  
pp. 1737-1742
Author(s):  
Josana Andreia Langner ◽  
Nereu Augusto Streck ◽  
Genei Antonio Dalmago ◽  
Lia Rejane Silveira Reiniger ◽  
Angelica Durigon ◽  
...  
Keyword(s):  
Developmental Stages ◽  
Block Design ◽  
Sowing Date ◽  
Maize Cultivars ◽  
Randomized Block Design ◽  
Sowing Dates ◽  
Developmental Rates ◽  
Cardinal Temperatures ◽  
Santa Maria ◽  
Emergence Phase

ABSTRACT: The objective of this study was to determine the maximum development rates for the phases of emergence, vegetative and reproductive, and to test the performance of the Wang and Engel (WE) model for simulating the development of landrace and improved maize cultivars sown on different dates. Model calibration was with data collected from a field experiment with a sowing date on December 13, 2014, and the model was tested with independent data from experiments with five sowing dates (August 20 and November 4, 2013, February 3 and August 15, 2014, and January 7, 2015) in Santa Maria, RS. The experiment was a complete randomized block design with four replicates. The dates of emergence (EM), silking (R1), and physiological maturity (R6) of two landraces ('Cinquentinha' and 'Bico de ouro') and two improved maize cultivars ('BRS Planalto' and 'AS 1573PRO') were recorded. Maximum daily developmental rates varied among cultivars from 0.2400 to 0.3411 d-1 for the emergence phase, from 0.0213 to 0.0234 d-1 for the vegetative phase, and from 0.0254 to 0.0298 d-1 for the reproductive phase. The WE model adequately estimated the developmental stages of landraces and improved maize cultivars with a mean error of 3.7 days. The cardinal temperatures used in the WE model were appropriate to estimate the developmental stages of landraces and improved maize cultivars.

PERFORMANCE PRODUTIVA DE CULTIVARES DE MILHO EM TRÊS SISTEMAS DE CULTIVO NO LESTE MARANHENSE

2017 ◽  
Vol 15 (3) ◽  
pp. 520
Author(s):  
FRANCISCO CHARLES DOS SANTOS SILVA ◽  
MARIA DA CRUZ CHAVES LIMA MOURA ◽  
JOSÉ RONEILSON SILVA COSTA ◽  
EGON BASTOS DE OLIVEIRA ◽  
ITALO JHONNY COSTA
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Block Design ◽  
Cropping System ◽  
Farming Systems ◽  
Correct Choice ◽  
Local Conditions ◽  
Maize Cultivars ◽  
Randomized Block Design ◽  
The City

RESUMO – O Leste Maranhense corresponde à mais nova fronteira agrícola do Brasil. Entretanto, fatores limitantesda produtividade, como a escolha correta da variedade e o sistema de cultivo mais adequado para as condições locais,ainda são desconhecidos. Objetivou-se estudar o desempenho produtivo de 17 genótipos de milho, sob três sistemasde cultivo para a região. Foram realizados dois experimentos, um na cidade de Chapadinha e outro na cidade de Brejo,sendo avaliados 17 genótipos ao todo. Os ensaios foram dispostos no delineamento em blocos casualisados com quatrorepetições em esquema fatorial 3x10 [10 cultivares e três sistemas de cultivo (plantio com cobertura de palha decarnaúba; plantio sem cobertura; plantio intercalado com feijão caupi)]. O sistema de cultivo com palha de carnaúba,independentemente do genótipo de milho e do local de avaliação, proporcionou os maiores rendimentos de grãos.Em Chapadinha, os genótipos mais produtivos foram as variedades de polinização aberta Caiano e Al-Bandeirante,o híbrido duplo AGN 1051, os híbridos triplos 2B 433, BRS 3060 e CMS 3E482 e o híbrido simples P 3646 H. ParaBrejo, os melhores resultados foram obtidos pelos híbridos duplos 2B 707 HX e AGN 1051 e pelos híbridos simples2B 604 HX, 30 F35 H e P 3646 H.Palavras-chave: Zea mays L., Palhada, Rendimento de grãos.PRODUCTIVE PERFORMANCE OF MAIZE CULTIVARS IN THREE FARMING SYSTEMS IN EAST MARANHÃO STATEABSTRACT - East Maranhão State is the newest agricultural frontier in Brazil. However, productivity limiting factorssuch as the correct choice of variety and the cropping system more suitable to the local conditions are still unknown.The objective of this study was to evaluate the productive performance of 17 maize genotypes under three cultivationsystems for the region. Two experiments were carried out, one in the city of Chapadinha and another in the city ofBrejo, evaluating 17 genotypes. The trials were arranged in a randomized block design with 4 replications in a 3x10factorial scheme [10 cultivars and 3 cultivation systems (planting with cover of carnaúba straw, plantation withoutcover, intercropping with cowpea). The use of carnaúba straw provided the highest grain yields, regardless the maizegenotype and the evaluation site,. In Chapadinha the most productive genotypes were the open-pollinated varietiesCaiano and Al-Bandeirante, the double hybrid AGN 1051, the triple hybrids 2B 433, BRS 3060 and CMS 3E482 andthe simple hybrid P 3646 H. For Brejo the best results were obtained by the double hybrids 2B 707 HX and AGN 1051and by the simple hybrids 2B 604 HX, 30 F35 H and P 3646 H.Keywords: Zea mays L., Straw, Grain Yield.

scholarly journals Base temperature, thermal time and phyllochron of escarole cultivation

2018 ◽  
Vol 36 (4) ◽  
pp. 466-472
Author(s):  
Denise Schmidt ◽  
Braulio O Caron ◽  
Oscar Valera ◽  
Daniela Meira ◽  
Daniele C Fontana ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Coefficient Of Variation ◽  
Regression Coefficient ◽  
Block Design ◽  
Thermal Time ◽  
Base Temperature ◽  
Degree Days ◽  
Randomized Block Design ◽  
Number Of Leaves ◽  
Santa Maria

ABSTRACT The objective of this study was to determine the base temperature of escarole and to apply in the phenological analysis of crop during four growing periods. The study was carried out with escarole (Chicorium endivia) ‘Escarola Lisa’ cultivar, at the Federal University of Santa Maria, campus Frederico Westphalen-RS. The experiment was performed in a randomized block design with four sowing periods (P1: 2/15/2015; P2: 04/29/2015, P3: 07/22/2015, P4: 10/16/2015) and 10 replicates, each replicate being one plant. The evaluations consisted of counting the number of leaves, performed three times a week after transplanting date until the harvesting point. To determine the base temperature, the following methods were used: standard deviation in degree-days (SDgd), standard deviation in days (SDd), coefficient of variation in degree-days (CVgd), coefficient of variation in days (CVd), regression coefficient (RC) and X-intercept. The base temperature for emission of two successive leaves in the escarole is 4.7°C, obtained by values of 4.0 and 5.5°C, observed in the SDgd and RC methods. For two leaves emission, the temperature between 16.6 and 27.8°C day leaf-1 is necessary.

scholarly journals Genetic variability and agronomic performance studies in chilli (Capsicum annum L.)

2017 ◽  
Vol 14 (2) ◽  
pp. 56-62
Author(s):  
D Kannan ◽  
DK Singh ◽  
SK Singh ◽  
A Palanisamy
Keyword(s):  
Genetic Variability ◽  
Performance Studies ◽  
Coefficient Of Variation ◽  
Block Design ◽  
Stem Diameter ◽  
Agronomic Performance ◽  
Genetic Advance ◽  
Plant Weight ◽  
Capsicum Annum ◽  
Randomized Block Design

Eight diverse genotypes of chilli were evaluated an open field study to evaluate the genetic variability, heritability and genetic advance in randomized block design (RBD) with three replications during Kharif, 2015-16. Analysis of variance revealed significant differences among the genotypes for all the characters studied. The higher estimates of genotypic coefficient of variation (GCV) were observed for flowers per branch (21.59%), clusters per plant (19.26%), flower per branch (16.93%) and stem diameter (15.49%). While the higher estimates of phenotypic coefficient of variation (PCV) were found for flowers per branch (26.70%), fruits per branch (24.44%), clusters per plant (24.04%) and stem diameter (19.26%). The higher estimates of broad sense heritability along with genetic advance recorded for flowers per branch (65%), fruits per plant (64%), cluster per plant (64%), stem diameter (65%), plant weight (59%) and days to 50% flowering (50%) indicated the scope for improvement of these characters through selection.SAARC J. Agri., 14(2): 56-62 (2016)

scholarly journals Genetic Variability and Molecular Diversity Analysis in Turmeric (Curcuma longa L.)

2021 ◽  
Author(s):  
Priya Patel ◽  
R.K. Patel ◽  
K.G. Modha ◽  
Thokchom Joydeep Singh ◽  
Manju Singh
Keyword(s):  
Genetic Variability ◽  
Ssr Markers ◽  
Coefficient Of Variation ◽  
Molecular Diversity ◽  
Curcuma Longa ◽  
Block Design ◽  
Herbaceous Plant ◽  
Randomized Block Design ◽  
The Family ◽  
Agronomical Traits

Background: Turmeric is an age old herbaceous plant belonging to the family Zingiberaceae growing in Tropical Africa and India with huge national and international demands. Conventionally, turmeric accessions are characterized using morphological and agronomical traits but less work is done in molecular characterization which is needed for thorough trait identification. Methods: The investigation was carried out during Kharif 2016-17 and comprised of thirty diverse genotypes of turmeric analyzed for genetic variability and molecular diversity which were evaluated in randomized block design with two replications. Fresh tender leaves were used to isolate DNA and PCR was performed with 9 SSR markers. Result: The values of phenotypic coefficient of variation were slightly higher than genotypic coefficient of variation. Highest heritability was observed for days to maturity, genetic advance was observed highest for green rhizome yield. Out of 9 SSR markers, primer pair 5, 6, 7, 8 and 9 were reported to exhibit 100% polymorphism, whereas; in terms of PIC, primer pairs 6 and 9 were found to be highly efficient ones. The similarity coefficient ranged from 0.44 to 1.00 and dendogram categorized the 30 genotypes into two main clusters.

scholarly journals Assessment of Genetic Variability and Transmissibility Index in Rice Genotypes (Oryza sativa L.)

2021 ◽  
pp. 34-42
Author(s):  
Ashish Sheera ◽  
Nashra Aftab ◽  
Sandeep Rout ◽  
Udit Nandan Mishra ◽  
Bupesh Sharma ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Grain Yield ◽  
Coefficient Of Variation ◽  
Oryza Sativa L ◽  
Block Design ◽  
Uttar Pradesh ◽  
Grain Filling ◽  
Randomized Block Design ◽  
Significant Difference ◽  
Days To Maturity

Aim: To assess the Genetic Variability among the accession/ genotype and its contributing traits. Methodology: A field experiment was conducted using 35 genotypes including 2 checks of rice during the season of kharif, 2017, at the Field Experimental Centre, Department of Genetics and Plant Breeding, SHUATS, Prayagraj, Uttar Pradesh to evaluate genetic variation and heritability of yield and related traits. The experiment was designed with a randomized block design (RBD) with three replications. Analysis of variance revealed significant difference among the genotypes for all traits indicating existence of genetic variability among the accessions. Results: Highest genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) were recorded for Spikelet’s per panicle, tillers per hill, panicle per hill and grain filling. High heritability in broad sense was obtained for days to 50% flowering (99.6%), days to maturity (98.7%), test weight (97.9%), harvest index (96.9%) and grain yield per hill (96.6%) which is indicating the high heritable portion of variation. High to medium estimate of heritability in genetic advance were obtained for grain yield (38.51), spikelet’s/ panicle (37.94), panicle/ hill (36.97) were indicating the roles of additive gene action and good scope of selection using their phenotype performance. Interpretation: Considering, all of these characters, spikelet’s per panicle, days to 50% flowering and days to maturity were important yield related traits and could be used for selection in future rice breeding programme.

Sign in / Sign up

Export Citation Format

Share Document