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Nitrogen constitutes about 79 percent of the earth's atmosphere,
yet, in an agricultural plant production system, it is still common
for soils to be deficient of the nitrogen needed for maximum plant
growth. But nitrogen fertilizers that are essential for the
economically driven production of food and fiber are recognized as
polluters of natural waters, and it has become increasingly
apparent that manufactured and naturally occurring nitrogen
resources must be better managed. This book addresses the problem
by describing how the various factors such as types of soils and
crops, irrigation methods, climate, and the nitrogen cycle itself
affect levels of nitrogen in plant production systems. The book
also provides a practical guide to the many advantages and
disadvantages of using different fertilizers across such factors as
environment, type of plant, and method of farming. This book will
be part of the solution to nitrogen management and agricultural
problems and will be of interest to workers in local, state, and
federal agricultural extension services, consulting firms,
environmental regulators, and students and researchers in soil
chemistry. This book is intended for workers in
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