This film explains why using green manure can have a beneficial affect if used when planting sweetcorn, similar to the 3sisters method of companion planting but much more successful in temperate regions
The real reason to grow sweetcorn is that until you do its hard to imagine just how wonderful it is quite simply covered in butter as it coverts sugars very quickly after picking The latest sweetcorns have shorter growing seasons but its still much better to start then off undercover