Chemical analysis is costly and unsatisfactory as a
guide to fertilization. Physical analysis by a competent man may have
distinct value, and especially to one lacking experience with his soil.
The mapping of soils by national and state authorities has given pretty
accurate knowledge of hundreds of soil types, their location and
characteristics, and when a soil expert obtains a sample of soil and
the history of its past treatment, he can assign it to its type and
give to its owner dependable advice regarding its crop-adaptation and
probable fertilizer requirements.
Next: The Use Of Nitrogen
Previous: Soil Analysis