Includes bibliographical references and index.

1. Advances in the characterization of phosphorus in organic wastes: environmental and agronomic applications.
2. Wheat genetics resource center: the first 25 years.
3. Cultivation of Stevia[Stevia rebaudiana(Bert.) Bertoni]: a comprehensive review.
4. Assessing soil fertility decline in th Tropics using soil chemical data.
5. Nematode interactions in nature: models for sustainable control of nematode pests of crop plants.
6. Algorithms determining ammonia emission from buildings hounsing cattle and pigs and from manure stores.