• Home
  • News
  • Agronomist: All Of That Snow This Past Winter Likely Had Little Impact On Depleted Subsoil Moisture

Agronomist: All Of That Snow This Past Winter Likely Had Little Impact On Depleted Subsoil Moisture

March 24, 2023 Steve Schwaller

(Undated)– It’s still a little too early to tell for sure, but experts say all of that snow we received this past winter more than likely didn’t do a whole lot to replenish depleted subsoil moisture. Gentry Sorenson, a Field Agronomist with Iowa State University Extension and Outreach, says the frozen soil prevented most of the snowmelt from making its way into the ground. He says while it’s likely the situation has improved somewhat, we will still be going into the upcoming growing season with a deficit…

“Last year we were about three inches, 3.26 inches of deficit versus historical averages across the fall. So I suspect it would be at a deficit but more closer to that historical average but it hasn’t completely recovered due to those frozen conditions. If we get some rainfall here after the soil has thawed, that’s when we really get our biggest bang.”

Sorenson says they’ll have a better handle on just what the exact subsoil moisture levels are in coming weeks…

“We’ll be out taking subsoil moisture readings here coming up in April and typically it’s done before the 15th of April but if we get some rainfall it may delay us a few days. It takes us about a week or so to do the calculations and get that information back, so we should have that information coming up on the tail end of April at the very latest.”

Sorenson says corn and soybean crops require about 20 inches of rainfall and subsoil moisture through the season to produce a crop. He says that can increase to 25 inches per season when temperatures are high and there’s a lot of wind.

About 2.44 inches of plant available moisture was measured last fall near Spirit Lake. Amounts were much less just to the south. The level at Rossie in Clay county was a half inch.