Sulfur Deficiency A Developing Issue

Sulfur Deficiency in Corn

Long taken for granted as supplied by the soil and atmosphere, sulfur is slowly rising as a yield-limiting nutrient in Midwestern crops.

Ken Ihlenfeld is certainly finding this to be true. The West Bend, WI, producer farms 2,500 acres including 400 acres of alfalfa used for his 400-head dairy operation. When his standard soil test couldn’t explain the yellowing and unevenness in his alfalfa fields he dug deeper including tissue testing for secondary macronutrients and micronutrients.  “We discovered sulfur levels were really low,” he says.

In 2011 he spread one ton of gypsum — a source of sulfate sulfur and calcium — per acre after the first cutting on 150 acres of alfalfa. A lack of rain likely resulted in little response for second cutting (gypsum is water soluble so moisture helps incorporate it into the soil profile), but by third cutting Ihlenfeld noticed a significant difference.

“There was a six inch height difference, the plants were greener and the crop was lush,” he says. “The treated acres yielded 0.6 tons more than the untreated acres on a dry matter basis.”

The success prompted him to apply gypsum on the rest of his alfalfa acres after third cutting and to some corn and soybean ground in November.

“Already this spring our hay fields are greener and more even in color than our neighbors that haven’t applied gypsum and the check strips we left are very noticeable,” he says.

After hearing repeated farmer accounts of sulfur improving corn yields, Fabian Fernandez, researcher and assistant professor of soil fertility and plant nutrition at University of Illinois, decided to test response himself. His three years of research farm and on-farm trials seem to confirm the reports.

“We have seen an increase in the frequency and intensity of crop response to sulfur application compared to Illinois trials conducted in the late 1970s which showed little to no response,” he reports. “The responses are very variable, but we are identifying conditions where sulfur applications will be beneficial for farmers.”

Results from a 2006 Iowa State University study on corn yield response to sulfur application showed an average 38-bushel yield response to sulfur application for six sites across northeast Iowa. These sites were specifically chosen for their likelihood of being sulfur deficient.1

In small research farm plots not specifically chosen for deficiency, Fernandez found a more moderate average five bushel corn yield response to sulfur applications over three years. One of his Illinois on-farm plots, though, yielded surprising results.

“It produced a one-year, 51-bushel corn increase over the check with an application of sulfur,” Fernandez says. “That’s not a normal response by a long shot, but it goes to show that if sulfur is truly deficient it can severely limit yields.”

Less Sulfur In Rain

Sulfur deposits on farm fields have decreased over the years, in part as a result of emission-reducing technologies used at coal-fired power plants. There is less sulfur in the atmosphere and in rain that hits farm fields. The adjoining maps compare deposits in 2008 versus 1985.

There is no simple test for determining sulfur deficiency on individual farms, says Warren Dick, a researcher and professor in Environmental and Natural Resources at The Ohio State University. Researchers have found, however, that certain factors can increase the likelihood of seeing a response to sulfur.

Soil type, cropping history and the crop planted can help determine on which acres farmers should try using sulfur. Soils with low organic matter are a good place to start as mineralization from organic materials is one of the leading sources of soil sulfur.2

“Soils with low organic matter, such as coarse texture (sandy) soils or eroded soils likely found on sloping hills, are more likely to be low in sulfur and respond to sulfur applications,” Fernandez says.

Sulfur is an essential ingredient for creating proteins, so high-protein crops (alfalfa, canola, soybean, corn silage) require more sulfur than low-protein producing crops.3

A lack of sulfur can impact nitrogen utilization and yield.

Estimates vary, but roughly one pound of sulfur is needed to be applied to balance up to 16 pounds of applied nitrogen for a corn plant to produce proteins and grow.2, 3  “If there’s adequate nitrogen but deficient sulfur the plant won’t grow to its potential until it has the sulfur to balance that nitrogen,” says Ron Chamberlain, GYPSOIL founder and chief agronomist. “Deficiencies are particularly critical in early growth corn because that’s when yield potential is set. If the upper soil profile, where seedlings are growing, is deficient of sulfur there will be less yield potential.”

Sulfur can be recycled back into the soil system through crop residue, Dick says, but in crops such as corn and alfalfa much of the protein — and sulfur — is removed with harvest.

“A 250-bushel corn crop removes quite a bit of sulfur every year without replacing it,” Dick says. “The same is true of hay fields. A lot of nutrients are removed when hay is cut and taken from the field, making alfalfa fields and mixed hay pastures good places to try sulfur applications.”

Sulfur Sources

There are several sulfur sources producers can use to meet crop demand including elemental sulfur, fertilizers such as ammonium thiosulfate, and gypsum.

“Elemental sulfur is used, but it is very acid forming so it isn’t ideal for every situation,” Dick says.

At 16% sulfur by volume, gypsum is a budget-friendly option. That is particularly true for growers who use Flue Gas Desulfurization (FGD) gypsum, a synthetic form that’s produced by the pollution control systems used to reduce emissions. Mined gypsum is significantly more expensive than FGD gypsum.

“The cost of a pound of sulfur in FGD gypsum is significantly lower than sulfur in other forms,” Chamberlain says. “It also provides sulfur in a plant-available form and moves sulfur through the soil profile so it’s where it needs to be in the form it needs to be in for plants to use it.” Gypsum provides the added benefit of 17-20% calcium and is often used in potato production and other calcium-loving specialty crops.

Extensive studies have shown all of the various gypsum sources are safe for land application, says Dick.

For Center Point, IN, producer Brad Brown, gypsum provides the double benefit of building soil structure and replenishing sulfur.

“We didn’t know about sulfur when we first started using gypsum in 1986 to loosen our soil for better drainage and rooting,” Brown says. “Getting sulfur with our gypsum was a win-win, it really helps our corn and it’s in the cheapest form we can get. Our yields are more even from acre to acre and year to year. The sulfur seems to excite the corn for good early season growth.”

Brown applies gypsum every other year. Initially he applied one ton per acre but has dropped to 1,400 pounds every other year applied in the fall ahead of corn.

“As the soil structure builds we’re able to cut back on the rate but we will keep applying it to maintain the sulfur supply for our corn. We shoot for 200-plus bushels per acre,” specifies Brown.

Wisconsin producer Ihlenfeld agrees gypsum is becoming a valued tool in his cropping operation.  “We were attributing sulfur deficiency symptoms to disease, but now that we know what it is we’re able to correct the situation and our yields improved after only one application,” Ihlenfeld says. “Gypsum is a win-win for us because it boost yields by correcting the sulfur deficiency and the calcium helps loosen up our compacted soils.

For more information about sulfur and gypsum, click here.

Footnotes:

1. Dealing With Sulfur Deficiency in Iowa Corn Production. Sawyer et al. 2009 Integrated Crop Management Conference – Iowa State University. 2009. P. 117-123.

2. Sulfur: A Missing Link Between Soils, Crops, and Nutrition. Franzen and Grant. 2008. P. 105-115.

3. Fertility Needs of No-Till Corn, Soybean and Wheat, Raymond C. Ward, Ward Laboratories, Inc. Kearney, NE.

Topics:

Leave a Reply

Micronutrients Stories
MicronutrientsMicronutrients Going Macro
September 9, 2014
Between 2014’s fantastic growing conditions and a heightened awareness on plant nutrition, the major players in micronutrients are gearing up for another big year. Read More
MicronutrientsReport: Demand For Zinc As Micronutrient In Agriculture Grows
May 12, 2014
Zinc is becoming more important to increasing crop yields as global population and food consumption continue to rise. Read More
Sulfur Deficiency In Corn
Micronutrients3 Key Questions For Sulfur Application
February 3, 2014
Match sulfur supply to corn crop’s needs to maximize yields and fertilizer dollars. Read More
Micronutrients11 Tips For Effective Fall Application Of Gypsum
September 26, 2013
Spreading gypsum – which often occurs in late fall, after harvest – is simple if you follow these basic steps from GYPSOIL. Read More
Top 100 Articles
Milan Kucerak, president/CEO, West Central
CropLife 100West Central Cooperative And Its New President Are A Match Made In Deviation
June 29, 2015
To appreciate just how unique West Central Cooperative is in the world of ag retail, an observer need only consider Read More
Winter Wheat
CropLife 100South Dakota Co-op Member Owners Vote No On Unification
June 26, 2015
The Boards of Directors for North Central Farmers Elevator (NCFE) and Wheat Growers (WG) have announced that member-owners have voted Read More
CropLife 100The Andersons Acquires South Dakota Plant Nutrient Manufacturer Kay-Flo
May 20, 2015
The Andersons, Inc., ranked No. 22 on the CropLife 100, has purchased Kay Flo Industries of North Sioux City, SD. “This Read More
CropLife 100AgGateway’s Barcoding Initiative Progressing Nicely
May 8, 2015
According to legend (or Wikipedia), the first step towards modern bar codes came back in 1948, when Bernard Silver, a Read More
CropLife 100Pinnacle Agriculture Acquires Minnesota Retailer
April 14, 2015
Pinnacle Agriculture Holdings, LLC, ranked No. 6 on the CropLife 100,  has successfully acquired Liebl Ag, LLC in Ada, MN.  Read More
CropLife 100CHS, Aurora Cooperative Complete Fertilizer Storage, Grain Shuttle Loading Facility
April 13, 2015
CHS Inc., the nation’s leading cooperative and ranked No. 5 on the CropLife 100, and Aurora Cooperative (ranked No. 21) Read More
Latest News
Chesapeake Bay
ManagementCourt Decision Protects Chesapeake Bay’s Water, Wildlif…
July 7, 2015
Today, the Third Circuit Court of Appeals upheld the historic clean-up plan for the Chesapeake Bay. Collin O’Mara, president and Read More
Agworld Apple Watch Farm Management
EquipmentAussie Data Management Software Company Making Its Mark…
July 4, 2015
Western-Australia-based Agworld — having fully launched its data management software system stateside last year after a 2013 soft launch — Read More
Topcon AGI-4 on MF Planter
EquipmentAutosteer: Compatibility, Accuracy Remain Top Of Mind
July 3, 2015
The world of automatic steering solutions in agriculture has evolved rapidly in the last few years. From after-market add-ons that Read More
ManagementUnited Suppliers/Land ‘O Lakes Merger & Crop Update
July 2, 2015
CropLife’s Paul Schrimpf and Eric Sfiligoj talk about the reasons behind the United Suppliers/Land ‘O Lakes merger and USDA’s recent Read More
Industry NewsBioSafe Adds To Sales Force
July 2, 2015
BioSafe Systems has announced the hire of two new members for its service team. David Britt recently joined the team Read More
Chesapeake Bay
ManagementChesapeake Bay Clean-Up Gets Renewed Attention
July 2, 2015
The Chesapeake Bay has been called one of the most biologically productive ecosystems in the world. It’s also one of Read More
Measuring Bulk Tanks
ManagementBulk Pesticide Compliance: Top 10 Areas Of Improvement …
July 1, 2015
  In honor of the 33-year run of David Letterman’s Late Show, the American Agronomic Stewardship Alliance (AASA) is happy Read More
Industry NewsArysta North America Hires Midwest Sales Manager
July 1, 2015
Arysta LifeScience North America recently announced the hiring of Brian Battles as the Senior Technical Sales Manager for the Midwest Read More
Farmer on tablet
Eric SfiligojThe Never-Ending Battle Against Modern Agriculture
July 1, 2015
In the world of comic books, the character of Superman often refers to the fight to save the world as Read More
Retail FacilitiesBuilding Up Ag Retail
July 1, 2015
In the oftentimes unpredictable world we live in, it’s nice to know some things can be reliably countered on to Read More
Retail FacilitiesMaple River Grain And Agronomy Phases In Site Developme…
July 1, 2015
Marcus Construction helped Maple River Grain and Agronomy in Casselton, ND, with the design-build of its dry fertilizer, liquid chemical/seed Read More
Retail FacilitiesA&B Welding Builds A New Liquid Terminal Hub For Br…
July 1, 2015
To build its new hub facility, Briggs Crop Nutrients enlisted the help of A&B Welding. The result, an efficient facility Read More
Edon Farmers Co-op
Retail FacilitiesNew Marcus Facility At Edon Farmers Co-op Provides More…
July 1, 2015
Edon Farmers Co-Op in Edon, OH, needed a new facility to consolidate outdated locations. Marcus Construction was able to design Read More
Retail FacilitiesKinder Morgan Expands Its Storage With A New Dome Barre…
July 1, 2015
Kinder Morgan wanted additional covered storage at its Dakota Bulk Terminal on the Mississippi River in St. Paul, MN. With Read More
Retail FacilitiesHeartland Tank Protects Fertilizer From Extreme Cold At…
July 1, 2015
The Arthur Companies in Harvey, ND, enlisted the help of Heartland Tank Companies to develop a new liquid fertilizer facility Read More
The McGregor Co. fertilizer loadout
Retail FacilitiesThe McGregor Co. Partners With Kahler Automation To Cre…
June 30, 2015
Kahler Automation helped The McGregor Co. expand its Clarkston, WA, operation with unstaffed loadout technology that enables customers to pick Read More
Dry and Liquid Plant
Retail FacilitiesKahler Automation Helps CHS Dakota Ag Cooperative Build…
June 30, 2015
CHS Dakota Ag Cooperative in Mooreton, ND, wanted a liquid/dry blender system that could meet the needs of its customers Read More
Crop InputsLand O’Lakes, United Suppliers To Merge Crop Inpu…
June 29, 2015
Land O’Lakes, Inc. and United Suppliers, Inc. of Ames, IA, today announced their intent to merge their crop inputs businesses. Read More