biblio toscana

Drainage for agriculture

Methods of soil analysis

part 3, Chemical methods

Multiple cropping

proceedings of a symposium

Replenishing soil fertility in Africa

proceedings of an International Symposium cosponsored by Divisions A-6 (International Agronomy) and S-4 (Soil Fertility and Plant Nutrition), and the International Center for Research in Agroforestry, held at the 88th Annual Meetings of the American Society of Agronomy and the Soil Science Society of America, Indianapolis, Indiana, 6 November 1996

Agricultural anhidrons ammonia

technology and use : proceedings of a symposium