Attributing points within "row" of points

I have point crop yield data that I need to attribute based on planted rows. Is there anyway other then selecting each point in the row and performing a field calculation to achieve this? Or is there a way to automate the selection and attribution process I describe? Currently there is not a field in the attribute table that could be used to identify a point in one row of points vs another row of points.

Any ideas would be much appreciated.

Thanks!