Agricultural development; Opportunities and threats for farmers and implications for extension organisations     

A.W. van den Ban 《The Journal of Agricultural Education and Extension》2013,19(3):145-156

Abstract

In many countries agriculture is in a process of rapid change,

• - it has to meet a growing demand for food in a sustainable way,

• - the international competition is increasing,

• - the increase in labour productivity is decreasing the employment opportunities in agriculture,

• - agricultural research is offering many new opportunities to increase productivity,

• - government price support for agricultural products in industrial countries is decreasing.

These changes have many implications for agricultural extension, such as:

• - the knowledge and capabilities of farmers has become a major factor in their ability to compete in national and international markets,

• - advice is not only needed on the adoption of new technologies, but also on many other decisions farmers have to make, such as the choice of their farming system and the decision whether or not to earn an income from outside agriculture,

• - this requires a change in extension methods and in the information sources extension agents use,

• - agricultural development demands painful changes in the way of farming and of living for many farm families. It is a challenge for extension agencies to help farm families to realise this,

• - a major task for leaders of extension organisations is to manage a process of change in agricultural extension. Often the role extension has to play in agricultural development can not be performed by one extension organisation, but only by a pluralistic extension system.

Agricultural extension is often expected to contribute to a reduction of poverty among farmers and farm labourers. One has to think seriously how one can realise this objective.  相似文献   

Farmers’ reasons for changing or not changing to more sustainable practices: An exploratory study of arable farming in the Netherlands     

A.J. de Buck  I. van Rijn  N.G. Roling  G.A.A. Wossink 《The Journal of Agricultural Education and Extension》2013,19(3):153-166

Abstract

The paper describes the results of an exploratory study of farmers’ reasons for changing or not changing to more sustainable production methods in arable farming in the Netherlands. The background of the research is the disappointing adoption of Integrated Arable Farming Systems (iafs). Perceived production risk was expected to be an important factor constraining adoption. This study suggests, however, that perceived risk is not a satisfactory explanation. One reason is that iafs as it has become in Dutch practice cannot be easily distinguished from conventional arable farming systems. A continuum of gradual adoption of iafs methods, mainly for economic reasons, was observed. A real watershed difference was observed between partial adopters of iafs and organic farmers who used no chemicals at all. Secondly, dealing with production risks, such as weather‐dependent problems with weeds, pests and diseases, is considered part of professionalism of both conventional and iafs farmers and hence not a reason for avoiding a specific crop husbandry technique. However, uncertainties emanating from market conditions and environmental policy were found to be important considerations. JAgr Educ Ext (2001, 7, 3, pp 153–166)  相似文献   

Book review     

A.W. van den Ban 《The Journal of Agricultural Education and Extension》2013,19(3):179-180

Miteinander Reden: Kommunikationspsychologie für Führungskräfte (Talking with another: Communication psychology for leaders). by F. Schulz von Thun, J. Ruppel and R. Stratmann (2000), Reinbek, RoRoRo Sachbuch 60687, ISBN 3 499 60687 9, DM 16.90.  相似文献   

Editorial     

Keith Morrison  Greetje van der Werf 《Educational Research and Evaluation》2013,19(8):691-692

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Neue TV-Formate im pädagogischen Blick     

Kira van Bebber 《Zeitschrift für Erziehungswissenschaft》2013,16(4):799-803

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DEVELOPMENT, EVALUATION, AND VALIDATION OF A PAPER-AND-PENCIL TEST FOR MEASURING TWO COMPONENTS OF BIOLOGY TEACHERS’ PEDAGOGICAL CONTENT KNOWLEDGE CONCERNING THE “CARDIOVASCULAR SYSTEM”     

Stephan Schmelzing  Jan H. van Driel  Melanie Jüttner  Stefanie Brandenbusch  Angela Sandmann  Birgit J. Neuhaus 《International Journal of Science and Mathematics Education》2013,11(6):1369-1390

One main focus of teacher education research concentrates on teachers’ pedagogical content knowledge (PCK). It has been shown that teachers’ PCK correlates with teaching effectiveness as well as with students’ achievement gains. Teachers’ PCK should be analyzed as one of the main important components to evaluate professional development programs. On this account, it is necessary to develop standardized measures of biology teachers’ topic-specific PCK that are labor-efficient. This paper presents a study on the development, evaluation, and validation of a paper-and-pencil test to measure biology teachers’ declarative PCK on the topic of blood and the human cardiovascular system. The development of the test was based, among other considerations, on a review of research literature on PCK and an analysis of 50 videotaped biology lessons. The final test instrument was comprised of 15 items distributed across 2 scales. The findings of the main study—with 93 preservice and in-service biology teachers and 12 biologists—confirmed that this measure of biology teachers’ declarative PCK was reliable, objective, and valid. In-service biology teachers scored higher on the test than preservice teachers (effect size Cohen’s d, 0.65) on one hand and, also, than biologists (Cohen’s d, 1.00) on the other hand. Future versions of this test should explore enlarging the scales and measuring procedural aspects of PCK.  相似文献   

Participants' Roles in the Context of a Video Club     

Elizabeth A. van Es 《学习科学杂志》2013,22(1):100-137

This study examines the nature of teacher participation in the context of a video club. Video clubs are professional development meetings in which teachers watch and discuss excerpts of video from their classrooms. In this study, I adopt a situative perspective to examine how teachers develop in their participation to accomplish the goals of the video club. In particular, I examine the roles participants play and explore teachers' participation in four roles that correspond with key goals of the video club. Analysis revealed that teachers' participation shifted in qualitatively different ways over time, with the teachers coming to prompt the group to discuss student mathematical thinking, to propose a variety of interpretations of student ideas, to build on one another's ideas, and to challenge one another's thinking in order to advance the group's conversations. This analysis suggests that the group learned how to participate in roles central to accomplishing the goals of the video club. Studying teacher learning through a lens of participation provides insight into the ways in which teachers coordinate themselves to engage with the goals of professional development and has implications for designing professional development that helps teachers develop practices for teaching mathematics for understanding.  相似文献   

Exploring the Potential of Smartphones and Tablets for Performance Support in Food Chemistry Laboratory Classes     

Koos van der Kolk  Rob Hartog  Gerrit Beldman  Harry Gruppen 《Journal of Science Education and Technology》2013,22(6):984-992

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Developing Service Area Indices for Community Colleges: California's Method and Experience     

Alice van Ommeren  Catharine Liddicoat  Willard Hom 《Community College Journal of Research & Practice》2013,37(7):463-479

The economic, educational and social environments of the students served by a community college are important factors in college performance accountability, policy analysis, program evaluation, and strategic planning. For example, previous research shows that income per county is a significant predictor of transfer rates for community colleges. However, conditions for the actual geographic area of the students served by a community college may differ, for various reasons, from the economic conditions for the county in which the college is located. This article describes the development of institutional or college-level indices as an enhancement to county-level data, their use as adjustment variables for California's Accountability Reporting for the Community Colleges (ARCC), and their applicability to other research and planning studies. The service area indices are created by combining the enrollment patterns of students by ZIP Code of residence with ZCTA (ZIP Code Tabulation Area) level economic and educational data from Census 2000.  相似文献   

Measurement Bias Detection Through Factor Analysis     

Willem E. Saris  Albert Satorra  William M. van der Veld 《Structural equation modeling》2013,20(4):561-582

Assessing the correctness of a structural equation model is essential to avoid drawing incorrect conclusions from empirical research. In the past, the chi-square test was recommended for assessing the correctness of the model but this test has been criticized because of its sensitivity to sample size. As a reaction, an abundance of fit indexes have been developed. The result of these developments is that structural equation modeling packages are now producing a large list of fit measures. One would think that this progression has led to a clear understanding of evaluating models with respect to model misspecifications. In this article we question the validity of approaches for model evaluation based on overall goodness-of-fit indexes. The argument against such usage is that they do not provide an adequate indication of the “size” of the model's misspecification. That is, they vary dramatically with the values of incidental parameters that are unrelated with the misspecification in the model. This is illustrated using simple but fundamental models. As an alternative method of model evaluation, we suggest using the expected parameter change in combination with the modification index (MI) and the power of the MI test.  相似文献