I'm investigating the breeding of fertilizer-intensive hybrid corn in the 1950s in the US. Two questions:
One source (Steele 1978, "The hybrid corn industry in the United States") says by 1955 some hybrids were being marketed as especially bred for high plant densities. I need to track down this marketing material -- adverts, speeches, brochures, anything.
I need a good source on the details of this breeding effort: which entities were doing the breeding, what lines were they using, who was paying for it, what were the first products put on the market, etc. I'm sure there is a good source on this but I can't seem to find it. The info I want is not in Kloppenburg, Fitzgerald, Steele.
Any leads appreciated