How can farmers maximize every unit of UAN sidedress they apply to help them reach their maximum yield potential?

Watch our on-demand webinar, "Enhancing UAN Sidedress Efficiency to Optimize Corn Yield Potential," to learn:

• What conditions favor best responses from sidedress nitrogen applications
  
  
• How enhancing a sidedress nitrogen application can potentially help offset the impact of planting delays
  
  
• When growers should apply UAN sidedress for optimal benefits
  
  
• How EXTRACT PBA can maximize the impact of UAN sidedress applications to optimize corn yield potential

Growers who are applying UAN sidedress this season have multiple technologies and practices they can utilize to minimize nitrogen loss to the environment and increase nitrogen efficiency and uptake by the corn crop. Examples include chemical nitrogen stabilizers, cultural Y-drop systems and Extract PBA nutrient release technology, all of which can be used individually or as part of an integrated approach to maximize the benefits of a UAN sidedress application.

Extract PBA is a biocatalyst technology for enhanced nutrient release and mineralization
combined with ammonium thiosulfate, a source of nitrogen and sulfur. By accelerating nutrient mineralization and recycling, Extract PBA can help improve crop growth and vigor, extend nutrient availability to the crop and improve nutrient efficiency when used with UAN sidedress.

How do we know that Extract PBA influences nitrogen availability?

One example comes from research performed at the University of Nebraska-Lincoln. There, at the West Central Research and Extension Center, Extract PBA was applied at 1 gallon per acre onto fallow soil (absent of a growing crop) with a history of manure applications. Soil testing was then performed on the treated and untreated fallow soil every two weeks for four months to determine nutrient availability and assess soil health. 

Extract PBA increased the availability of all pools of nitrogen, including inorganic and potentially mineralizable N pools, compared to the untreated soil.

Corn undergoes a period of rapid nitrogen uptake after the V8 growth stage and through tassel and silking. If nitrogen is not readily available to the corn plant as it enters this period, it can limit yield potential.

With UAN, this is especially applicable to the urea portion of the fertilizer (comprising 50% of the UAN), which has to be converted into ammonium before the plant can use it. Enhancing a sidedress UAN application with Extract PBA, which accelerates nutrient mineralization and recycling, can ensure that the crop has the nitrogen it needs in that 21-day period of rapid uptake without falling short.

With planting wrapping up, Agricen’s Scott Lay sat down with WITY Radio’s Dennis Michelsen to discuss how Extract PBA can enhance sidedress nitrogen applications.

Dennis - WITY Radio: With the wet spring, I think it makes a product like Extract PBA even more important this year.

Scott - Agricen: With the later planting, advancing the crop through all of its physiological stages from emergence on out is critical. One way we can do that is by increasing nutrient availability with Extract PBA to hasten maturity and move the crop through its growth phases as quickly and as efficiently as possible.

Dennis - WITY Radio: There’s no doubt from the trials that have been done over the years that Extract PBA really does help improve the efficiency of a sidedress application of liquid nitrogen. How and why does this work so well?

Scott - Agricen: By incorporating Extract PBA in a sidedress UAN 28 or 32 application, we’re able to increase the pool of available nitrogen by mineralizing more nutrients that are already in the soil profile—in other words, converting that nitrogen into an inorganic form the plant can use. And our university studies have shown that we’re able to increase the available nitrate levels by about 10 percent with Extract PBA, giving the applied nitrogen a higher level of efficiency.

Although it’s tempting for growers to put out all of their nitrogen early in the season when it’s easier to apply, splitting the application into a pre-plant and a sidedress application can be an effective way to ensure that the corn crop has enough nitrogen to meet its needs at peak demand. This can be especially beneficial in wet years where leaching of pre-plant nitrogen is likely to have occurred.

Below we answer three common questions on corn nitrogen demands and discuss ways to make the most efficient sidedress application.

When does a corn crop need most of its nitrogen?

Growers often want to put nitrogen out early in the season—when it is easier to apply—to get their corn crop “up and going.” However, actual peak nitrogen demand for corn is right before tassel (V10 – V14), continuing on through grain fill. Making a sidedress nitrogen application can be an effective way of making sure the crop has the nitrogen it needs when demand is greatest.

We all know the importance of nitrogen in producing a high-yielding corn crop, but it is easy to forget or even ignore that the timing of an nitrogen application can be the key to maximizing its benefits.

Nitrogen applied pre-plant can be susceptible to loss through volatility, denitrification or leaching, which means it may not be available for use by the crop at critical stages. Peak demand for nitrogen in a corn crop comes between V10-V14 (right before tasseling) and, although the demand measured in pounds of nitrogen taken up per day may slow, nitrogen is still a critical factor in grain fill.