Rapeseed

Who'd of thought that such a small delicate flower could give us the massive great fields that we all know and love. We have a field near us which is bordered by hedgerows of gorse. When the sun is out the field is almost luminous but when its cloudy the field becomes a very dull colour and the gorse glows. 
I wonder how much a farmer gets paid for it. It does seem a fairly reliable crop.