manual was written by Dr Sam Portch of the Potash and Phosphate
Institute and Dr. Arvel Hunter, president of Agro Services
book focuses on different aspects of the systematic approach for
soil fertility evaluation and improvement. Written in the form of an
operational manual, a researcher can follow the procedures in a step
by step manner.
procedures and methodology outlined in this book are the ones that
we use in our lab. They have been tested and improved upon over 35
years in thousands of trials with thousands of soils.
contact us for a copy of this booklet.
Approach to Soil Fertility Evaluation and Improvement