There is a difference between sweet corn and maize. They are both maize as such, but usually different cultivars bred for different purposes. Most of the maize you see in fields in the autumn is for animal feed. The crop is harvested in its entirety, chopped into smaller pieces and is then used for maize silage. A sort of pickling process that preserves fodder for the winter feeding period.
The production of maize for grain is a dicey business. A long, dry autumn is needed to dry the grain out sufficiently, and a wet period can be nightmare. Grain maize is marginal in the UK. I remember the very wet autumn of 1974 and seeing a combine struggling through a field of maize whilst the ground was frosted in February 1975. I bet he didn't plant that crop again.
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