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Average age of Iowa farmers mirrors national trend in 1960s data
The article explains fertilizer history and its impact on crop yields, noting early manure and bone use, rock dust experiments, and the 1843 superphosphate breakthrough. It then gives farm age figures: Iowa farmers averaged 48.5 years in 1969, unchanged from 1964, vs 47.6 in 1959. nationwide averages were 51.2 in 1969, 51.3 in 1964, and 50.5 in 1959.
MENTIONED IN THIS ARTICLE
America
Europe
Sir John Lawes
Rothamsted
England
Iowa
U. S