I can watch my crop roots grow on my I cell phone. Not literally, but I can tell I you exactly what depth crops have rooted to in fields where we have installed weather stations with moisture probes.Day by day, the soil moisture line stairsteps down the graph as roots dig deeper into the soil profile and deplete water to that point. It's fascinating to watch water use. You can see when the plants wake up and start drawing water for the day. It's like a live feed to the root zone.
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