I'd love to think that a crop spraying emphasis may aid planning permission for a grass landing strip.
My long term plan is to have a farm West of London and have a grass landing strip where I/we can keep our plane. If I could say that I needed to have a landing strip to be able to dust my crops (which will conviniently be there!) 15 times a year...i'm sure it would be a good aid. Also a lot of strips around the UK got their planning this way years ago.