You have said whether the corn field is a farmers field or a large garden of your neighbors. If the corn is a farmers field the field will be rotated in crops every year. Generally from corn to beans to winter wheat. If a farmers field, walk out into the field and you should see the short blades of grass protruding from the ground, this is winter wheat which will be harvested in late May.
I don't feel having crops behind your house is a negative. Your primary concern would be to have the well water checked (assuming the home is on well water) for nitrates in the water. Nitrates in your water cannot exceed 10 parts per million by EPA standards and will negatively effects brain developement in pregant mothers and infants.
RE/MAX Realty Group