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Soil Fertility : A Guide to Organic and Inorganic Soil Amendments

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Soil Fertility : A Guide to Organic and Inorganic Soil Amendments

Robert Parnes

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This book has four parts. The Frist part discusses the importance of organic residues to soil fertility and proposes an energy index for comparing organic and inorganic fertilizers; addresses the controversy regarding the effect of organic and inorganic fertilizers on food quality; and discusses options for determining fertilizer applications. The second part covers the range of organic fertilizers including unprocessed locally available residues and compost as well as cover crops; processed wastes; and commercial organic fertilizers. The third part has a chapter for each soil nutrient, except for a single chapter on trace elements. Each chapter describes the importance of the nutrient to the plant; its behavior in the soil; and common organic and inorganic fertilizers and application rates. The _nal part consists of four appendices which contain the only use of chemical and mathematical equations in the book. Appendix A is a collection of conversion xi Preface factors that may be useful. Appendix B presents the details of the argument behind the energy credit proposed for organic matter in Chapter 2. Appendix C calculations on the liming value and acidity of various fertilizers. Appendix D contains a derivation of graphs in _figure 7.1 showing the loss of organic matter in a composting process under different conditions.

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