i'd have to say that the farm rows of trees don't look TOO awfully bad when you're done there at them...but just looking at the small version of the Mega-preview they are a bit of an eye-sore. I think the best thing to do would be to make some 'fruit' type trees...rather than just use any random tree kind as most of those trees don't look like they would bear any kind of fruit or anything worth eating and thus would never be planted in such a fine row set like that or be on a farm. Personally i'd prefer to see Cherry Trees or something of that like...it'd add a bit of color if done well and it'd add another style of tree. (provided if you did do cherry trees in bloom it'd be kind of like WTF in the TS environment as you will see down there with the pic i provided. lol)
this is the best example of a Cherry Orchard I could find...not what i was wanting as it doesn't show the perspective side like it would be shown in TS. And If I could go up to where my relatives live in Michigan and it was around the spring time then I could get some awesome pictures to show for this but that isn't happening...

but as you can see the trees are smaller than normal trees and kind of bush out more when it starts hitting the limbs which is more typical of most fruit trees that are farmed. I think if you made about 5-8 different 'fruit' trees and varied them in those lots every so often then it should look better. But again...it doesn't look too awful bad unless you're looking at the sized down mega preview.
also just figured i'd point out that...you have some tiberium like right on the edge of the greener more lush grass and i think in one spot actually on it. And you know that just can't happen! So fix it. XD

sorry had to bring that up for some unknown reason.