NDSU Extension Agronomist Greg Endres says soil types have an impact on phosphorus amount, which, in return, can affect how much application gets put down. “We’ve identified soil types where we’ve had low or very low testing soils for phosphorus. So, we looked at fairly modest rates of applications along with banding. The most common row spacing would be around 30 inches, although there’s a trend toward narrow rows. So, we looked at those applications and compared it to untreated checks and to pre-plant soil applied phosphorus. We have seen a yield response with modest rates.” Endres says there’s always some risk to the seed. “We need to keep rates low because there’s always a risk to the seed. But at two and a half to three galloons has worked quite nicely on our soil types.”
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