Birdman, I agree with Pete & Ken ... If your ground has slope to it ,Your more than likely to position your rows to avoid erosion...
I have also heard that the taller growing crops may have an advantage being planted east to west for sun going down the rows rather than across the rows ,causing uneven growth due to sun blockage of plants somewhat if planted north to south.... Just something to think about...
But I'm sure real farmers lay there feilds out in the pattern that makes the planting and harvesting easiest for them,at least thats what makes sense to me /forums/images/graemlins/cool.gif