that is what they are in the area I live in

Simply entering "field road" in Google immediately gives you pictures, including one through a canola field that is paved, and a couple of others that aren't. And googling the German term gives you similar pictures of both paved and unpaved ones. Don't know about British English since I'm an American, but it may be the same thing.

it's called in the US. Could also be a trample path, but that's something generally negotiable in single file only.

PS: There's even a C&W song by that name: Country road, country road

Hi Diana,
Isn't that what they mean?

"Boreen" would be the Irish equivalent, though I'm not sure how many other BE speakers would understand it.

http://en.wikipedia.org/wiki/Boreen

That's what I would use since it's common enough:

Example below:

"Taria and Link walked along the dirt path across the field in silence."

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Note added at 40 mins (2013-06-08 18:36:50 GMT)
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Steffen is right by saying that German "Feldwege" are not always paved. In fact, I would go as far as to assert that German "Feldwege" are never paved unless they're called "asphaltierter Feldweg". I actually missed that part in the description. Based on that, I'd just call it a "country lane". See below:

"agricultural landscape with a country lane across the fields, overlaid with a delicate warm texture"
http://www.istockphoto.com/stock-photo-18090165-agricultural...

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Note added at 46 mins (2013-06-08 18:42:27 GMT)
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Images of country lanes:

https://www.google.com/search?q="country lane"&bav=on.2,or.r...

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Note added at 10 hrs (2013-06-09 04:31:46 GMT)
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Thanks, Diana, for your input. You're right for the most part. But this is how I see it. I am sure the locals using the term "Feldweg" are aware that this is not the most accurate designation in the world. If you google "Feldweg", what comes up is an array of pathways similar to what you find when you google "country lane".
http://www.google.de/search?gs_rn=16&gs_ri=psy-ab&suggest=p&...
This is actually a recurring problem in translation. When a term is used sloppily in the source text, you're essentially left with two choices. Replicate that sloppiness or find a term that fits the description better than the original. There's no right answer that applies each time in my opinion. I occasionally go for the second option if I feel that the target text would otherwise be unintelligible. More often than not, though, I go for something that conjures up imagery comparable to the original term. In my opinion, we cannot be expected to provide translations that are more accurate than the original. An exception applies if the alternative is more problematic in the target language than the source term is in the original language. I concede that this may be true for country lane but it's probably a forgivable mistake given that Feldweg is clearly a misnomer to begin with.

Might this link help (found it by looking up Feldweg and then clicking on the English version of the Wikipedia page)? Note photo!
http://en.wikipedia.org/wiki/Agricultural_road

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Note added at 1 day13 hrs (2013-06-10 07:14:02 GMT)
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Yes, I was aware the article as such might not be trustworthy, but it reminded me of the term, which I had somewhere in the back of my head but couldn't at first recall:)