Dictionary of Weed Science

Dictionary of Weed Science
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Dictionary of Weed Science

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Publisher: Agrotech Publications
ISBN: 9788185680002
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PREFACE
Agriculture has been defined as a "controversy with weeds". Weeds cause more crop losses than diseases and insects combined. The efficient practice of weed control using the most modern techniques and tools available could advance world food production more than any other single practice. Freeing people of underdeveloped countries from spending most of their time growing enough food for a bare living would make it possible for each to develop a new spirit, to advance culturally and scientifically and to take their places in improving the quality of civilization. Hunger, or the threat of hunger, stifles all the higher aspirations of mankind. Weeds are plants which are nuisance. It includes plants which are physiologically diverse, e.g. plants that are parasites, and plants of various growth forms including annuals perennials, herbs and trees, aquatics, xerophytes, and epiphytes. The unity which weedy species posses derives from their nuisance value that they interfere with one or other of man s activities. Weeds are recognized as pests that seriously reduce the productive capacity of agricultural lands and in many other ways interfere with man a efforts to grow useful plants. Weed pose serious problem in crop production. They are quite troublesome in lawns and gardens and create serious problems along highway, rail roads and in irrigation and drainage systems. Weeds have been reported to be quite harmful as they create health hazards both to the animals and human beings. In the crop, the weed may become a nuisance because it is poisonous to stock or taints milk or grain. Weed seeds may spoil wool or hinder harvesting operations. Weeds may interfere directly with the growth of the crop, possibly by toxin production or by making demands on light, water or nutrients which are in limiting supply. Estimates of the financial loss to agriculture caused by weeds have reached astronomical levels. Maximum profits from the farm can be achieved only when these losses are reduced to a minimum by using the cheapest and most efficient methods of weed control. The selection of a method of weed control for any particular situation, however, presents a technical problem that the farmer is often unable to solve, the reason for this is the recent introduction of a large number of chemical weedkillers and the lack of any simple but comprehensive guide on their Accurate identification of weeds is even more difficult than that of crop and horticultural plants.Nevertheless, the editor and the advisory board have made every effort to assure positive identification of important weeds. Weed control, one of the arduous arts of agriculture, practiced through countless ages, has within the past five decades been developed into a science of increasing complexity. Weed science is a miracle which revolutionized world agriculture through the concept of chemical weed control. Weed research was greatly stimulated in 1944 with the first use of 2,4-D for the selective killing of weeds. Since that time much progress has been made, new
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interest has developed, and many capable scientists have focussed their talents and energies on the weed problem. Rapid progress has been made recently and many more developments are portended the years that lie ahead. The practice of selective control of weeds by chemicals has scarcely come of age, yet in the brief and meteoric lifetime it has transformed many aspects of plant