The Experts below are selected from a list of 6990 Experts worldwide ranked by ideXlab platform
Manjit S Kang - One of the best experts on this subject based on the ideXlab platform.
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gge biplot analysis a graphical tool for breeders geneticists and Agronomists
2002Co-Authors: Weikai Yan, Manjit S KangAbstract:GENOTYPE-BY-ENVIRONMENT INTERACTION AND STABILITY ANALYSIS Genotype-by-Environment Interaction Heredity and Environment Genotype-by-Environment Interaction Implications of GEI in Crop Breeding Causes of Genotype-by-Environment Interaction Stability Analyses in Plant Breeding and Performance Trials Stability Analysis in Plant Breeding and Performance Trials Stability Concepts and Statistics Dealing with Genotype-by-Environment Interaction GGE Biplot: Genotype + GE Interaction GGE BIPLOT AND MULTI-ENVIRONMENTAL TRIAL ANALYSIS Theory of Biplot The Concept of Biplot The Inner-Product Property of a Biplot Visualizing the Biplot Relationships among Columns and among Rows Biplot Analysis of Two-Way Data Introduction to GGE Biplot The Concept of GGE and GGE Biplot The Basic Model for a GGE Biplot Methods of Singular Value Partitioning An Alternative Model for GGE Biplot Three Types of Data Transformation Generating a GGE Biplot Using Conventional Methods Biplot Analysis of Multi-Environment Trial Data Objectives of Multi-Environment Trial Data Analysis Simple Comparisons Using GGE Biplot Mega-Environment Investigation Cultivar Evaluation for a Given Mega-Environment Evaluation of Test Environments Comparison with the AMMI Biplot Interpreting Genotype-by-Environment Interaction GGE BIPLOT SOFTWARE AND APPLICATIONS TO OTHER TYPES OF TWO-WAY DATA GGE Biplot Software-The Solution for GGE Biplot Analyses The Need for GGE Biplot Software The Terminology of Entries and Testers Preparing Data File for GGE Biplot Organization of GGE Biplot Software Functions for a Genotype-by-Environment Dataset Function for a Genotype-by-Strain Dataset Application of GGE Biplot to Other Types of Two-way Data GGE Biplot Continues to Evolve Cultivar Evaluation Based on Multiple Traits Why Multiple Traits? Cultivar Evaluation Based on Multiple Traits Identifying Traits for Indirect Selection for Loaf Volume Identification of Redundant Traits Comparing Cultivars as Packages of Traits Investigation of Different Selection Strategies Systems Understanding of Crop Improvement Three-Mode Principal Component Analysis and Visualization QTL Identification Using GGE Biplot Why Biplot? Data Source and Model Grouping of Linked Markers Gene Mapping Using Biplot QTL Identification via GGE Biplot Interconnectedness among Traits and Pleiotropic Effects of a Given Locus Understanding DH Lines through the Biplot Pattern QTL and GE Interaction Biplot Analysis of Diallel Data Model for Biplot Analysis of Diallel Data General Combining Ability of Parents Specific Combining Ability of Parents Heterotic Groups The Best Testers for Assessing General Combining Ability of Parents The Best Crosses Hypothesis on the Genetic Constitution of Parents Targeting a Large Dataset Advantages and Disadvantages of the Biplot Approach Biplot Analysis of Host Genotype-by-Pathogen Strain Interactions Vertical vs. Horizontal Resistance Genotype-By-Strain Interaction for a Barley Net Blotch Genotype-by-Strain Interaction for Wheat Fusarium Head Blight Biplot Analysis to Detect Synergism between Genotypes of Different Species Genotype-by-Strain Interaction for Nitrogen-Fixation Wheat-Maize Interaction for Wheat Haploid Embryo Formation References Index
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simultaneous selection for yield and stability in crop performance trials consequences for growers
Agronomy Journal, 1993Co-Authors: Manjit S KangAbstract:Utilization of genotype x environment (GE) interaction encountered in crop performance trials is an important issue among plant breeders and Agronomists. Practical integration of yield and stability of performance has not been achieved. The purposes of this paper are (i) to examine consequences to growers when researchers commit Type I (rejecting the null hypothesis or H 0 when it is true) and Type II (accepting the H 0 when it is false) errors under a yield-based, conventional selection method (CM) and a proposed method (yield-stability statistic or YS i ) that uses GE interaction, and (ii) to show why a greater emphasis on the stability component would be advantageous to growers [...]
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simultaneous selection for yield and stability in crop performance trials consequences for growers
Agronomy Journal, 1993Co-Authors: Manjit S KangAbstract:Utilization of genotype x environment (GE) interaction encountered in crop performance trials is an important issue among plant breeders and Agronomists. Practical integration of yield and stability of performance has not been achieved. The purposes of this paper are (i) to examine consequences to growers when researchers commit Type I (rejecting the null hypothesis or H 0 when it is true) and Type II (accepting the H 0 when it is false) errors under a yield-based, conventional selection method (CM) and a proposed method (yield-stability statistic or YS i ) that uses GE interaction, and (ii) to show why a greater emphasis on the stability component would be advantageous to growers [...]
Daniel Cluzeau - One of the best experts on this subject based on the ideXlab platform.
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Indicators of earthworm bioturbation to improve visual assessment of soil structure
Soil and Tillage Research, 2017Co-Authors: Denis Piron, Hubert Boizard, Djilali Heddadj, Guénola Pérès, Vincent Hallaire, Daniel CluzeauAbstract:Abstract Earthworm bioturbation, a biological process that strongly influences soil structure dynamics, is attracting more interest with the development of no-tillage farming. However, while methods for Visual Soil Structure Assessment (VSSA) are of great use to Agronomists working to improve crop management and preserve soil structure, few methods have indicators that consider earthworm biostructures. One reason is that VSSA methods were initially created for conventional tillage systems, where tillage and compaction are the main drivers of soil structure over time, while bioturbation is a secondary driver. However, bioturbation is now recognised as an important process for soil functioning under no-tillage and reduced tillage systems. Among biostructures, the presence of burrows is one frequently-used indicator, but casts are rarely studied in the field, except in the “Soil-Structure Patterns” method (SSP), which provides a typology of soil structure that includes earthworm features. However the SSP typology appears complex (11 patterns), and implementing the method is time consuming. To improve VSSA methods, we identified patterns to define new indicators of earthworm bioturbation. We first assessed whether the patterns identified were useful for highlighting the real impact of bioturbation on the distribution of soil structures and the impact of tillage on earthworm activity. We then applied the pattern descriptions to the “profil cultural” method, which provides a detailed assessment of soil structure in the soil profile. This study was performed at two experimental sites in France experiencing different types of soil impacts (i.e. tillage, compaction). Identifying patterns in soil morphological units helped us to define four types of bioturbation: (1) type 0: no visible bioturbation; (2) type 1: presence of burrows; (3) type 2: presence of a few fresh cast aggregates; and (4) type 3: high presence of casts in different welded states. This new typology seemed relevant and complementary to typical indicators. When applied to the “profil cultural” method, these bioturbation indicators can improve the assessment of the soil structure usually provided by VSSA methods and provide more accurate information to Agronomists and farmers about soil functioning, including biological activities.
Jeanphilippe Deguine - One of the best experts on this subject based on the ideXlab platform.
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crop protection biological control habitat management and integrated farming
2009Co-Authors: Pierre Ferron, Jeanphilippe DeguineAbstract:In a context of rationalised agriculture integrating the principles of sustainable development, preventive measures for crop protection are called upon to play a dominant role. These are based on close knowledge of the functioning of agroecosystems. They are aimed at managing biological pests and their natural enemies, first through action on their habitats both in crop fields and in the non-cultivated part of the farm. A balance of the biological control possibilities available is drawn up and attention paid to the application of recent knowledge in conservation biology. The bases of pest control with a ranking of the various intervention techniques are then set out. Implementation means the development of cropping systems and therefore increased participation by Agronomists and also a break with certain agronomic practices commonly used by farmers today.
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crop protection biological control habitat management and integrated farming a review
Agronomy for Sustainable Development, 2005Co-Authors: Pierre Ferron, Jeanphilippe DeguineAbstract:In a context of rationalised agriculture integrating the principles of sustainable development, preventive measures for crop protection are called upon to play a dominant role. These preventive measures are based on close knowledge of the functioning of agroecosystems. They are aimed at managing biological pests and their natural enemies, first through action on their habitats both in crop fields and in the non-cultivated part of the farm. A balance of the biological control possibilities available is drawn up and attention paid to the application of recent knowledge in conservation biology. The bases of pest control with a ranking of the various intervention techniques are then set out. Implementation means the development of cropping systems and therefore increased participation by Agronomists and also a break with certain agronomic practices commonly used by farmers today.
David Lawrence - One of the best experts on this subject based on the ideXlab platform.
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the influence of agronomic advice upon soil water thresholds used for planting decisions in southern queensland s grains region
Agricultural Systems, 2011Co-Authors: Toni Darbas, David LawrenceAbstract:Abstract At least two decades of sustained research, development and extension (RDE take the opportunity to plant at least some crop each season; and plant at the appropriate time to maximise crop yield and consider stored soil water a bonus. These planting strategies were perceived by the interviewees to be aligned to agronomic advice differentiated by its commercial terms. Private Agronomists, hired via an annual retainer, tended to be associated with the first planting strategy while retail Agronomists, hired through the purchase of chemicals, were perceived as associated with the second strategy. These results indicate that an industry wide comparison of planting strategies in terms of yield outcomes and economic performance over multiple years is warranted in order to facilitate industry wide discussion of the trade-offs between long term enterprise profitability and short term economic pressures.
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the trade off between agronomic advice and risk management strategies for planting decisions in the darling downs grains region of australia
Research Papers in Economics, 2010Co-Authors: Toni Darbas, David LawrenceAbstract:A decade of sustained research, development and extension (RDE take the opportunity to plant at least some crop each season; and plant at the appropriate time to maximise crop yield and consider stored soil water a bonus. These planting strategies were perceived by the interviewees to be aligned to agronomic advice differentiated by its commercial terms. Private Agronomists, hired via an annual retainer, tended to be associated with the first planting strategy while retail Agronomists, hired through the purchase of chemicals, were perceived as associated with the second strategy. These results indicate that an industry wide comparison of planting strategies in terms of yield outcomes and economic performance over multiple years is warranted in order to facilitate industry wide discussion of the trade-offs between long term enterprise profitability and short term economic pressures.
Denis Piron - One of the best experts on this subject based on the ideXlab platform.
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Indicators of earthworm bioturbation to improve visual assessment of soil structure
Soil and Tillage Research, 2017Co-Authors: Denis Piron, Hubert Boizard, Djilali Heddadj, Guénola Pérès, Vincent Hallaire, Daniel CluzeauAbstract:Abstract Earthworm bioturbation, a biological process that strongly influences soil structure dynamics, is attracting more interest with the development of no-tillage farming. However, while methods for Visual Soil Structure Assessment (VSSA) are of great use to Agronomists working to improve crop management and preserve soil structure, few methods have indicators that consider earthworm biostructures. One reason is that VSSA methods were initially created for conventional tillage systems, where tillage and compaction are the main drivers of soil structure over time, while bioturbation is a secondary driver. However, bioturbation is now recognised as an important process for soil functioning under no-tillage and reduced tillage systems. Among biostructures, the presence of burrows is one frequently-used indicator, but casts are rarely studied in the field, except in the “Soil-Structure Patterns” method (SSP), which provides a typology of soil structure that includes earthworm features. However the SSP typology appears complex (11 patterns), and implementing the method is time consuming. To improve VSSA methods, we identified patterns to define new indicators of earthworm bioturbation. We first assessed whether the patterns identified were useful for highlighting the real impact of bioturbation on the distribution of soil structures and the impact of tillage on earthworm activity. We then applied the pattern descriptions to the “profil cultural” method, which provides a detailed assessment of soil structure in the soil profile. This study was performed at two experimental sites in France experiencing different types of soil impacts (i.e. tillage, compaction). Identifying patterns in soil morphological units helped us to define four types of bioturbation: (1) type 0: no visible bioturbation; (2) type 1: presence of burrows; (3) type 2: presence of a few fresh cast aggregates; and (4) type 3: high presence of casts in different welded states. This new typology seemed relevant and complementary to typical indicators. When applied to the “profil cultural” method, these bioturbation indicators can improve the assessment of the soil structure usually provided by VSSA methods and provide more accurate information to Agronomists and farmers about soil functioning, including biological activities.