I was in my third year of college at Iowa State, taking Agricultural Engineering in September 1959, when Khruschev came through the campus.  Classes were dismissed and and all the students were standing on the street to see the caravan go through with him.  There were many Secret Service surrounding the campus.  I saw him in the limousine as he went by.  One of the stories that an Ag Engineering professor told the next day was that they had stopped at the Ag Engineering building and Khruschev and his fellow Russians insisted that they see the machine that planted the wire checked corn, which they saw in the field, where you could cultivate cross-wise.  They were amazed that corn could be planted in such a fashion, that corn could be cultivated both ways.  The professors kind of laughed, because wire checked corn was diminishing as a practice.  In the fall of 1957, when I started at Iowa State, one of their field trips to an ag farm, the ag professors showed us corn that had not been cultivated.  Later on, I found out that it was Atrazine that they had sprayed it with.  I was amazed that you could grow corn without cultivating it, throughout the growing season. Having grown up cultivating corn three or four times in the summer, it seemed like a miracle that you could get by without cultivating.