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Synopsis Many new methods have been devised to aid farmers in fertilizing their crops more effectively, by a large group of agricultural scientists working in the diagnostic field. This book is to bring together in one volume a comprehensive discussion of both the underlying theory and the practical application of the various techniques. To attain that objective, the services of a group of distinguished scientists were enlisted to prepare the various chapters. These scientists are outstanding in their respective spheres of work, both as to theory and practice. All diagnostic methods are designed for the purpose of estimating the fertility status of soils and the nutritional requirements of crops, the methods are to be regarded as complementary and not competitive, to which end all are useful and all may well be applied. The agricultural scientists, have contributed the literature for this a valuable book.