FROM THE PREFACE: Weeds reduce agricultural output and/or add to the costs of production and are therefore important economically. Moreover weed research scientists, administrators, and farmers make decisions about allocating resources (i.e. make economic decisions) every day. Weed control and economics are inseparable in an agricultural production context and the economic effects of weeds are diverse and complex. In this book we have endeavoured to present a broad but penetrating view of the impact of weeds and assessment of their control.The book is aimed to provide agricultural scientists, administrators, advisors, and students with a greater appreciation of the economic impact of weeds and of the economic assessment of weed control strategies and methods. For agricultural economists, the book will provide an agronomic background and an economic framework for tackling issues in weed control and research.

Weed Control Economics (Applied Botany and Crop Science)

Business & Money

B. A. Auld

K. M. Menz

C. A. Tisdell

Economics

Academic Press

<p>Volume One begins with a systematic development of basic concepts (strain, stress, stiffness and compliance, viscous clamping) and coordinate transformations in both tensor and matrix notation. The basic elastic field equations are then written in a form analogous to Maxwell's equations. This analogy is then pursued when analyzing wave propagation in both isotropic and anisotropic solids. Piezoelectricity and bulk wave transducers are treated in the final chapter. Appendixes list slowness diagrams and material properties for various crystalline solids. Volume Two applies the material developed in Volume One to a variety of boundary value problems (reflection and refraction at plane surfaces, composite media, waveguides, and resonators). Pursuing the electromagnetic analogue, analytic techniques commonly used in electromagnetism (for example, normal mode emissions), are applied to elastic problems. Two final chapters treat perturbation and variational methods. An appendix lists properties of Rayleigh surface waves on single crystal substrates.</p>

Acoustic Fields and Waves in Solids, 2 Vol. Set

Science & Math

Physics

Krieger Publishing Company

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