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Nitrogen Fertilizer Prices and Costs Lower for 2018 | Interview

Nitrogen fertilizer prices are averaging lower now than in any time since September 2008. These lower prices could translate into roughly a $10 per acre saving in nitrogen fertilizer for the coming 2018 production year. Further savings may be possible for those farms who are applying above recommended nitrogen rates and are willing to cut fertilizer application rates. University recommendations suggest nitrogen application rates well below 200 pounds in northern and central Illinois.

Todd Gleason talked with University of Illinois agricultural economist Gary Schnitkey about his farmdocDaily article.

Average anhydrous ammonia prices in Illinois are reported approximately twice a month in the Illinois Production Cost Report, a publication of the Agricultural Marketing Service, an agency of the U.S. Department of Agriculture. In the November 10th report, the anhydrous ammonia price was reported at an average of $405 per ton, with an offer range from $343 per ton up to $440 per ton. Anhydrous ammonia prices have averaged $404 per ton during the months of September, October, and November of 2017.



The $404 per ton average in 2017 is considerably lower than fall prices in recent years. AMS has been reporting anhydrous ammonia prices since 2008 (see Figure 1). This year’s $404 per ton price is the lowest fall price since reporting began in 2008.



Farmers can leverage this lower price even more by using the MRTN to optimize yield. The online N-Rate Calculator is the work of seven corn state Land Grant universities. The calculator uses the prices of nitrogen and corn to optimize yield for the highest revenue. This is different than maximizing yield. It seeks to maximize dollars.

Through the lower cost of nitrogen and use of the N-Rate Calculator northern and central Illinois farmers may save approximately $10 per acre writes Gary Schnitkey on farmdocDaily.

Calculating N-Rates for Corn | with Emerson Nafziger

University of Illinois Agronomist Emerson Nafziger says deep prairie soils can provide up to one-hundred-pounds of N annually. This makes nitrogen fertilizer applications less limiting than once thought. Todd Gleason talks with Nafziger about how farmers should calculate anhydrous ammonia rates this fall.



Timing Fall Nitrogen
by Emerson Nafziger, Extension Agronomist - University of Illinois
original blog post

The substantial rain that fell over central and northern Illinois between October 5 and 15 mostly soaked into the soil that was dried out by crop water use, and harvest has moved back to full speed in most areas. With harvest, thoughts turn to application of fall ammonia in central and northern Illinois. Almost everyone is on board with waiting until soil temperatures are at or below 50 degrees before applying ammonia. Cool soil (along with use of nitrification inhibitor) lowers the rate of nitrification, so helps preserve N in the ammonium form. Nitrogen present in the soil as ammonium is safe from loss.

Once air and soil temperatures start to decline in October, it’s natural to anticipate that soil temperatures will reach 50 soon, so some are inclined to start to apply before soil temperatures reach 50 degrees. But if we apply when soil is at 60 degrees and soil temperatures fail to drop quickly, or if they rise again after application, nitrification will continue and will persist as long as soils stay warmer. In fact, nitrification does not stop dead at 50 degrees; as a biological process, its rate drops off as temperature falls, but temperatures need to near freezing for nitrification to stop completely.

So we need to wait to apply fall ammonia not only until soil temperatures are 50 or less, but until we have reasonable confidence that they’ll stay there. In Illinois, we normally consider November 1 to be the date at which we can be reasonably sure that soil temperatures won’t rise again until the next spring. That’s not a sure thing, however – in both of the past two years, soil temperatures have gone above 50 at least once between November and February. But most years it’s a reasonable starting date to balance keeping N safe with getting fall application done.

Minimum air temperatures have fallen into the 40s this past week, which has people wondering if it might be OK to go ahead and start applying now. Minimum soil temperatures 4 inches deep under bare soil (from the Illinois Water Survey http://www.isws.illinois.edu/warm/soil) have dropped to the upper 40s to low 50s over much of the state each day between October 16 and 18 this week. The problem with using only the minimum soil temperature is that it doesn’t represent the actual soil temperature in the ammonia application zone. As Figure 1 shows, minimum soil temperatures (on clear days) are typically five degrees or so less than average soil temperatures for the day. So even though we may need a jacket on cool mornings this week, ammonia applied now is not going to be in soils with temperatures less than 50 degrees for some days or weeks.

Figure 1. Soil temperature at 4 inches under bare soil at three Illinois Climate Network sites on October 17, 2017. Source: Illinois State Water Survey.
Figure 1. Soil temperature at 4 inches under bare soil at three Illinois Climate Network sites on October 17, 2017. Source: Illinois State Water Survey.

Air temperatures are forecast to stay in the 70s the rest of this week, to fall into the 50s (with lows in the mid to upper 30s) next week, then to rise again (with dry weather) for some period after that. We’re already past the average first frost date for central and northern Illinois, and even with more seasonal temperatures coming the last week of October, it doesn’t look like ammonia applied now will be as safe from nitrification and possible loss as will ammonia applied in November.

If the soil is in condition to apply ammonia, soil temperatures are in the upper 40s, and the 10-day forecast doesn’t show above-normal temperatures settling in, the last few days of October might offer an opportunity to start applying ammonia. But what if early November is warmer than normal, and soil temperatures remain above 50? Delaying application, of course, moves us closer to having safer soil temperatures.

Average Illinois fall temperatures have been trending slowly upward for some decades now, and as we have seen the last few years, waiting until November 1 does not assure low soil temperatures as consistently as it did in the past. So if a stretch of warm weather is still in the forecast at the end of October, it might make sense to wait a little longer. Otherwise, patience in waiting another 10 days will likely be rewarded, even if – as is often be the case when doing the right thing – the reward isn’t very visible.

Adjusting Nitrogen for this Corn Crop

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Despite the wet weather many think may be causing nitrogen fertilizer to get away from corn plants, it is still far too early to make that decision.

While it seems likely some nitrogen fertilizer has moved out of the upper soil as a result of rainfall this year University of Illinois Agronomist Emerson Nafziger says if soils dry out, the torrential rains stop, the sun shines, and the weather gets warmer things should be all good, “The crop is going to tell us this. If by the middle of June some of the crop has really greened up nicely and some has not, then we might need to think about those that haven’t and determine if enough nitrogen is missing to cause this to take place. My suspicion is we will not see very much of that at all. If we are warm and dry and with sunshine for a week, I think the crop is going to look good in almost every field.”

My suspicion is we will not see very much of that at all. If we are warm and dry and with sunshine for a week, I think the crop is going to look good in almost every field. - Emerson Nafziger

One indication the topsoil hasn’t been stripped clean of nitrogen is the good recovery of green leaf color. Nafziger says, as soils dry out, root systems start to expand and the color will change. He explains the corn crop at this point looks like it does not because of lack of N, but due to cool temperatures and abundant rainfall. While it is premature to revise nitrogen management based on what has happened so far, Nafziger cautions it cannot be ruled out, “I would be very reluctant now to make a decision that we need to go put more nitrogen on, especially if we’ve already put the full amount on. If we still need to side-dress and we add 10, or 15, or 20 pounds I don’t have a problem with that. But I think it is premature to decide so much of the nitrogen is gone that we put out there that we need to go back and plan to put more on at this point.”

The good news is there is still time to make such decisions. The corn crop takes up barely one pound of N per acre for every inch of growth it makes up to about knee-high.

Nitrogen deficiency develops over time, and Nafziger says it is almost always more related to current soil moisture than to the amount nitrogen in the soil. So, if fields aren’t extra wet or extra dry over the next month, this season could still turn out to be much more typical than many now expect.

Choosing Nitrogen Rates

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The growing season has started and most corn farmers have already applied nitrogen. It is a very expensive plant food and getting the rate right may mean using a little less.

Here’s how the University of Illinois nitrogen recommendation used to work. It was formula equal to roughly one-point-two times the expected yield minus the nitrogen leftover from the previous crop. That “yield-goal-based system” recommends too much for today’s corn hybrids says University of Illinois Extension Agronomist Emerson Nafziger, “That yield-goal-based system flat-out doesn’t work anymore. The reason it doesn’t is that our yields have gone up a lot, and we are clearly showing that yields have gone up more than requirements for nitrogen have gone up.”

Nafziger believes there are two reasons for the change. First, he says the system always recommended more nitrogen than was really needed. The other is that hybrids have become much better at extracting what’s there; water and the nutrients that come with water. Nitrogen is the main one of those. Nafziger says, “Today we get higher yields and do not have to use the 1.2 pounds of nitrogen per bushel or what ever formulation people were using.”

ILLINOIS abandon the formula about ten years ago in a favor of a system used and promoted by Land Grant’s throughout the corn belt. It is called the N Rate Calculator and it actually brought the Illinois rates down by a few pounds for this year.

Nafziger says at current corn and nitrogen prices, guideline rates for corn following soybean are 154, 172, and 179 pounds of nitrogen per acre in northern, central, and southern Illinois, respectively. 200, 200, and 189 for corn after corn. Southern Illinois farmers will make note that their rate for corn after soybeans is higher than in either central or northern Illinois and lower than both of those for corn after corn.

Is Fall-Applied Nitrogen Still Present

Corn growers are concerned about the amount of fall-applied nitrogen that might have been lost through the winter and how this might change nitrogen management this spring.

The first question that needs to be asked on nitrogen management is simple says University of Illinois Extension Agronomist Emerson Nafziger. You need to know how much nitrogen the crop will need, then how much is naturally available, and finally, how much should be applied.

“Our best estimate, and this is a bit of a floppy number, is the crop will take up about a pound of nitrogen for each bushel it produces. About two-thirds of that is going to be in the grain and removed by harvest of the crop. The other third will be in the residue. Some of this will get back into the soil, some won’t”, says Emerson Nafziger.

The amount of nitrogen needed then is about 1 pound for every bushel expected. If the expected yield is 200 bushels to the acre, then it will need 200 pounds of nitrogen.

Pay attention to this part.

Nafziger wrote in an article for the U of I’s pest management bulletin on April 18th that the more productive soils in Illinois contain about 3.5% organic matter. A rule of thumb calculation, read it online in The Bulletin, puts the N from this organic matter at 140 pounds. In some years this is apparently all available to the crop, and in others it isn’t.

The N Rate Calculator, which you may find online, tries to average out the low and high organic N years. N added as fertilizer for corn following soybeans in southern and central Illinois should be about 170 pounds, 20 pounds less in northern Illinois.

As for nitrogen loss, Nafziger has this to say in The Bulletin as it relates to his recent nitrogen treatment studies, “ these results show both the risk of N loss and the benefit from delaying some of the N or using inhibitors may be a little less than we’ve thought. Getting data from another year or two will help paint the picture more fully, but these results give some reason to be confident that the N management systems in common use all have good potential to provide the crop with N. Adding costs by changing N management, for example by making another trip over the field to apply late N, may not provide a positive return compared to applying all of the N in one or two earlier trips.”

Nafziger says the corn crop takes up most of its nitrogen in June.

Nafziger on 2016 Growing Season

Univeristy of Illinois Extension Agronomist talks with Todd Gleason about the amount of nitrogen available to the corn plant during the growing season, how that fertilizer faired over the warm wet winter months, when to plant corn, and if it is ok to plant soybeans earlier than normal.

Free & Confidential Tile Line Water Test at Farm Progress Show

Nine states in the Mississippi River basin have developed strategies to control the amount of nitrogen and phosphorous making its way to the Gulf of Mexico. These plant nutrients contribute to the Hypoxia Zone. During the Farm Progress Show the Illinois Corn Growers Association is offering free tile line water sample testing to help make farmers aware of the plan and the problem.

Let’s start with the problem. The fertilizers used on lawns, gardens, and farms doesn’t always stay put. It leaches into streams and rivers and is carried to the Gulf of Mexico where the plant nutrients cause great algae blooms. These deplete the water of oxygen and aquatic life.

The plan is to voluntarily reduce the plant nutrient load. The first step says Illinois Corn Growers Director of Communications Tricia Braid is to make farmers aware of just how much nitrogen is being lost from their fields. That’s why the Corn Growers are offering free water sample testing at the Farm Progress Show.

Quote Summary - Because farmers want to keep the nutrients applied for the crop where the crop needs it. If it is starting to move out of your tiles, that is lost money for the farmer and also a potential problem for the water quality. So we are working at awareness here and helping people get an understanding of what nitrogen movement means on their farms.

This awareness campaign is also related to the recent release of the Illinois Nutrient Reduction Loss strategy. It is a document put forth by the Illinois Environmental Protection Agency and the Illinois Department of Agriculture that sets some clean water goals for all the stake holders in Illinois to achieve.

Quote Summary - So, agriculture plays a big part in that. We are not the only people involved. We understand that, but we certainly do have a role to play. The example we have for the Decatur area, the site of the Farm Progress Show, is that on average tile drained ground in the Sangamon River Watershed loses about 26 pounds of nitrogen per acre per year. That adds up. If it is leaving the tile, it is not helping the crop, and it is going somewhere unintended. We really want folks to understand how nutrients are moving at different times of the year.

Those wanting to have their tile line water tested can bring an 8 ounce sample to the Illinois Corn Growers Association tent at the Farm Progress Show. Collect the sample within 48 hours of arriving. Keep it refrigerated until you leave for the show. If you’d like more results you can do a flow test. Just count off how many seconds it takes the tile line to fill a five gallon bucket.