Search results for ""author don wallace""

This book consists of letters spanning the last few years between an Ambassador in Washington, friendly to this country, and his Government's Prime Minister, seeking to show the Prime Minister what and why we are as we are. The book's title derives from a letter from the Prime Minister to the President of the U.S., inspired by the Ambassador's correspondence with the Prime Minister. The letters, while full of admiration for America, are highly critical of the way we handle our international economic and social affairs.

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Improvements in adaptation and maturity leading to greater yield are the most important criteria for the acceptance of a new crop cultivar, since it is the yield which dictates the economic value of the crop. Therefore, yield improvement is one goal of virtually every crop breeding program. Many such programs have tended to concentrate on identifying the genetic traits responsible for higher yield and selecting each of them in the later stages of the breeding cycle. However, selection for yield per se is still the most effective method, since it is a combination of traits, operating within the limits of the system, which finally determines yield. This book presents a whole-system, or holistic viewpoint for the improvement of adaptation, maturity and yield. Central to its thesis is recognition that system-established changes in levels of the components of the plant system, within a constant capacity, i.e. within the limitations of the system, determines yield and other cultivar characteristics. It goes on to describe how this can improve our understanding of plant systems and enable breeders to maximise performance under prevailing field conditions. Based principally on 25 years research by the authors, the ideas presented in this book are essential reading for crop physiologists and plant breeders.

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