Well, manxman, it could be me that's talking shyte. It's a long time since I've read Levengood's seed studies and I have only a general idea left that some crop circles in young plants are associated with dessicated seeds (sometimes whole seed heads being dessicated), and that later on in the growing period seeds from certain crop circles turn up larger than average and generate more vigorous plants. I wouldn't want to argue with your encyclopedic knowledge of the crop fields and whether local ccmakers would set down a formation close to harvest time, but as I recall crop circles have indeed appeared in late August, year after year {maybe made by nonlocals?}.
i know because i spent my teenage years hand hauling bales [straw] for pocket money for my uncles, when they were square [ the bales not my uncles ], and decoying/crop protection, for the next 20 years, right up to 14 years ago, until i got nicked for drink driving, and they then refused to renew my firearms certificate because of it, its why ive had a 9 year break between labradores.
constance i am not getting at you, it just doesnt make sense for an experienced team to make circles in combinable crop, it would be a case of now you see it, now you dont, and seed crops on hillsides rippen/mature quicker than low land crop, due to limited rain in summer plus drainage of the slope, means a shorter stem, as growth goes into the reproduction end [seed], and the CC makers do like their hillside locations, honestly a dry spring will mean a barley crop no more than a foot high..
The most valuable seed is next years sowing seed, near zero moister content and weight makes that primo, milling wheat/grain includes everything from piss wet thru to bone dry, and the price reflects how much treatment it needs before storing and processing, in truth alot will get rolled and used as feed for live-stock as drying costs for a poor yield just aint worth it..or atleast then it wasnt worth it [30yrs ago].
back when i was in my 20s the ratio to achieve was around 2.5 ton to 1 ton sown, to make it worthwhile, be better now i would think, combines were pretty wasteful then, and now there are more productive varieties, so to give an idea of what .5 [half]of a ton of standing barley covers, is about the size of a penalty box goalmouth on a football field, and seed grain was £120 a ton.
So a decent sized circle, probably cost's the farmer now £200/£300 in lost grain.