“This variety is a very efficient user of nitrogen, and some growers are just applying too much. Our studies show 90 percent of Clearfield 151’s yield potential can be achieved at just 88 pounds of N, and for most situations 118 to120 pounds is about ideal.”

Nitrogen rate/lodging studies for Clearfield 151 have shown no significant difference in yields for N rates as high as 135 to 180 pounds

 “We’ve simply got to get away from the mentality that nitrogen response is linear — that the more N you apply, the more yield you’ll get. In many cases, particularly with a variety like this, growers are over-applying nitrogen.”

Not only does that increase potential for lodging in a variety like 151, Walker says, “with $500 per ton urea, you’re spending money unnecessarily.”

Seeding rate can also have an impact on lodging with Clearfield 151, he notes.

“In our studies, we had less lodging with a seeding rate of about 30 seeds per square foot, or 65 pounds per acre, and about 120 pounds total N. Managing Clearfield 151 with the appropriate combination of seed rate and N rate can be effective in managing lodging. Protecting the seed with effective seed treatment is recommended, especially at the recommended seeding rate.”

Nitrogen stability is also important, Walker says. “There are a lot of nitrogen stabilizer products on the market, but Agrotain is the only one tests have shown to do what it says it will do.

“Because nitrogen is such an important component of rice production and because it is so expensive, growers need to protect that investment. The data show this product works — it offers a proven mechanism for limiting volatilization of nitrogen.”

hbrandon@farmpress.com