Combined selection for adaptability, genotypic stability and cowpea yield from mixed models.

The potential expression of crop productivity is a constant challenge for plant breeders in the face of oscillations in environmental variables, making selection difficult and increasing the operational and methodological costs in obtaining the ideal cultivar for a determined region. The objective of the research was to investigate the effects of genotype x environment interaction in the selection of cowpea lines with high grain yield, adaptability, and genotypic stability simultaneously, in environments of the Northwest region of Rio de Janeiro State, using mixed models (Maximum Restricted Likelihood - REML/Best Linear Unbiased Prediction - BLUP)

Selection of high-performance black-eyed cowpea (Vigna unguiculata) through GYT biplot analysis: a new methodology based on multiple characteristics.

Cowpea bean is a common crop quite appreciated in Brazil. However, it is known that its low yield depending on soil and climatic conditions. The aim of this research is the selection of high-performance black-eyed cowpea through GYT biplot analysis. Twelve (12) cowpea bean strains were assessed between 2016 and. The study followed a randomized complete block design, with four repetitions; two commercial cultivars were used ascheck. The following variables were assessed: number of days required for flowering, final stand, value for cultivation, pod yield, pod length, mean number of grains per pod and grain weight. The analysis of variance showed genetic variability between strains, differences between the assessed years and different strain-performance in each growing year. Based on the GYT biplot graph, cultivar BRS Itaim, and strains L9 and L7 recorded the best performance for the set of yield characteristics. Variable ?pod length? had positive correlation to bedding, number of days required for flowering and number of grains per pod. Variable ?100-grain weight? had positive correlation to final stand, pod yield and mean grain weight per pod. Strains L9, L7 and cultivar BRS Itaim recorded the best yield regarding the assessed variables

Comparison of stability methods in elephant-grass genotypes for energy purposes.

Elephant grass is a plant of tropical origin with high biomass-production potential that stands out today as an alternative energy source. The potential of its genotypes depends on the genotype × environment interaction. The objective of this study was to estimate the genotype × environment interaction and compare stability methods in elephant grass for biomass production in a biannual cutting regime. The experiment was conducted in a randomized block design with two replicates and evaluations of 73 elephant-grass genotypes in six cuts. The trait dry matter yield was utilized for the analysis of the genotype × environment interaction and the stability. The stability analysis methods employed were those of Yates and Cochran, Plaisted and Peterson, Wricke, Annicchiarico, Lin and Binns, and Huehn. Kang and Phan?s ranking was adopted for all the methods. Spearman?s coefficient was utilized to evaluate the degree of agreement between the different methods employed. Significant differences were observed for the genotype × environment interaction. Non-parametric Lin and Binns? and Annicchiarico?s methods were more discriminating than the analysis of variance methods in the evaluation of stability and productivity of the tested genotypes

Work structuring and product design for customized repetitive projects

Ballard’s concept of work structuring for production planning in construction can be applied to improve production flow in construction projects formed by repetitive units with extensive customization. Customization can increase the value of repetitive units (apartments in a building, houses in an allotment, or stores in a shopping mall) forming a project, by meeting clients’ specific requirements. However, in traditional construction production systems, it commonly causes delays, stoppages, rework, increased amounts of work in progress, and excessive movement of crews and materials. The problem has been thoroughly documented and various production systems have been designed to address the trade-off between flow and value. We identify five such systems, which were originally developed following exploratory design science principles. In this work, we analyse and compare them using nine metrics to assess their performance in terms of flow and value, and to explore the role of work structuring in customized projects. The systems with the most effective flow are the Fit-Out Company and the Ecosystem Platform systems. The analysis led to the theoretical proposition of a hybrid production system called Product/Process Modularization, which may be applied and tested in the future

Work structuring and product design for customized repetitive projects

Ballard’s concept of work structuring for production planning in construction can be applied to improve production flow in construction projects formed by repetitive units with extensive customization. Customization can increase the value of repetitive units (apartments in a building, houses in an allotment, or stores in a shopping mall) forming a project, by meeting clients’ specific requirements. However, in traditional construction production systems, it commonly causes delays, stoppages, rework, increased amounts of work in progress, and excessive movement of crews and materials. The problem has been thoroughly documented and various production systems have been designed to address the trade-off between flow and value. We identify five such systems, which were originally developed following exploratory design science principles. In this work, we analyse and compare them using nine metrics to assess their performance in terms of flow and value, and to explore the role of work structuring in customized projects. The systems with the most effective flow are the Fit-Out Company and the Ecosystem Platform systems. The analysis led to the theoretical proposition of a hybrid production system called Product/Process Modularization, which may be applied and tested in the future

GYT biplot analysis: a new approach for cowpea line selection.

Cowpea beans is grown under different edaphoclimatic conditions throughout Brazilian regions causing them to perform differently due to the influence that environments have on genotypes. Thus, it is necessary to obtain lines adapted to the specific cultivation environments so that it can present high yield. The objective of this work was to select cowpea lines through the GYT biplot multivariate analysis

GYT biplot analysis: a new approach for cowpea line selection.

Cowpea beans is grown under different edaphoclimatic conditions throughout Brazilian regions causing them to perform differently due to the influence that environments have on genotypes. Thus, it is necessary to obtain lines adapted to the specific cultivation environments so that it can present high yield. The objective of this work was to select cowpea lines through the GYT biplot multivariate analysis.Made available in DSpace on 2019-11-20T00:41:27Z (GMT). No. of bitstreams: 1 Oliveiraetal2019.pdf: 349566 bytes, checksum: fb3c01a7109a965108effdd226c1ce3a (MD5) Previous issue date: 2019bitstream/item/205015/1/Oliveira-et-al-2019.pd

Ganho de seleção no melhoramento genético de feijão-caupi.

Foram avaliadas 14 linhagens de feijão-caupi, nas safras de 2015 e 2016, no município de Bom Jesus de Itabapoana, localizado no Noroeste do Estado do Rio de Janeiro (Latitude 21o08'02"S, longitude 41o40'47"W e altitude 88m), temperatura média anual de 23oC e solo classificado como latossolo vermelho-amarelo + cambissolo, segundo a classificação climática revista de Köppen-Geiger (Alvares, 2013). O delineamento experimental utilizado foi o de blocos casualizados com quatro repetições, sendo a parcela experimental constituída por quatro linhas de 5m, com espaçamento entre fileiras de 0,20m x 0,50m, tendo como área útil as duas fileiras centrais. O desbaste foi realizado 15 dias após o plantio, deixando apenas uma planta por cova. As características avaliadas foram: peso de vagens por planta (PVP): determinada pelo peso total em gramas (g) de vagens por planta, peso de grãos por vagem (PGV): peso total em gramas (g) de sementes/vagem; peso de 100 grãos (W100S): pesagem de 100 sementes, de uma amostra escolhida aleatoriamente; e produtividade de grãos (PG): quantificação do peso total em gramas (g) dos grãos de cada planta após a debulha de vagens. Estas avaliações foram obtidas com o auxílio de balança de precisão