Lessons learned from Spring Creek Farms quiz
Watch the webinar recording first on
, then take this quiz. Certified crop advisors who receive passing scores of 3 or higher are eligible to receive 1 CEU in Soil & Water Management.
Annual surface runoff amounts at Spring Creek Farms were like other locations and farming systems monitored by Discovery Farms. Why might this be even though these fields had high infiltration rates and no-till management?
Runoff happens, especially during frozen soil conditions. 57% of runoff at these site happened during frozen soil conditions.
No-till management alone does not decrease runoff unless cover crops are incorporated into the system.
57% of runoff happened during large storm events when no surface residue was left on the soil.
The amount of annual precipitation had little impact on the amount of annual runoff at Spring Creek Farms. Why was this?
The farm did not leave enough residue to adequately protect soils.
Precipitation timing and intensity have more of an impact on the amount of surface runoff.
Tile drainage played a key role keeping surface runoff at bay when precipitation happened on non-frozen soils.
When soil losses go up, phosphorus losses go up. When soil losses go down, phosphorus losses tend to level out. Why is this?
Total phosphorus is a mixture of particulate (soil bound) + dissolved phosphorus. When reducing soil loss you likely lower particulate phosphorus but trade lower particulate for higher risk of dissolved phosphorus losses.
Phosphorus loss is not related to soil loss.
In no-till management systems, the biggest concern is particulate phosphorus loss because of low soil losses.
Why is stratified soil test phosphorus a risk to water quality in a no-till system?
High phosphorus levels in the first three inches of soil are at greater risk to be lost in the particulate form in no-till systems because of high soil loss.
High phosphorus tests are a risk for ground water.
Phosphorus accumulated at the surface along with residue present is at risk to be lost in the dissolved phosphorus form.
What happened on June 21, 2013 at Spring Creek monitoring sites?
A phosphorus application was applied to the field the day before a large storm which elevated P levels.
A split application of nitrogen was applied too late and did not get taken up by the crop.
A second split application of nitrogen was applied that day right before a large rainfall event. This elevated the loss of nitrogen that day.
Please provide your name.
Never submit passwords through Google Forms.
This content is neither created nor endorsed by Google.
Terms of Service