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I always wanted to ask, why such circle-crop formations are usually in a square greed, instead of hexagonal? is it because it's easier to move tractors and other stuff between them, or is it because land isn't that scare resource as I imagine it?

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TL;DR, simpler mechanics for the irrigation system.

The circular pattern comes from the area irrigated by the simplest configuration of a center-pivot [0], which is a fixed point in the center to access water. "Non-circular" area require linear/lateral movement "center-pivots" that require a way more complex control system, or some kind of booster to cover the "corners of a square".

[0] https://en.wikipedia.org/wiki/Center_pivot_irrigation

I think this is not what parent asked. The question was why circles are arranged in square grids but not in haxagons. Which is great question, and I would like to know the answer too.

I suspect it's because the land ownership is mostly rectangles, as are the adjoining roads.

The "circular" is clear. But the "square grid" part is not. Why are the circles arranged in a square grid instead of a hexagonal one? Is it property definition difficulty?

Imagine driving a large heavy vehicle to a hex in the center of the grid: way too many turns.

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