Determining Total Fertility In Strip-Tilled Fields

Band fertilizer placement may cause non-uniform distribution in the soil.

Why does this matter?

Because when fertilizer is unevenly distributed, it may not be possible to use traditional sampling strategies to measure whole-field fertility, said University of Illinois assistant professor of crop sciences Fabián Fernández. No recent published studies have looked at this problem.

Fernández has conducted research to determine potassium and phosphorous distribution in no-till and strip-till soils and to develop improved sampling procedures for measuring field fertility.

The problem, according to Fernández, is that fertility decreases between the rows but increases in the rows where the fertilizers are being banded. This would not be a problem if the location of the fertilizer band changed from year to year.

“Since the introduction of real-time kinematic (RTK) satellite navigation and the use of strip-till, farmers are always planting, and applying their band fertilizer, on exactly the same location,” he explained. “What happens is that all the fertilizer that was applied uniformly on the surface is now concentrated in a small fraction of the soil.” Because plant roots extend farther into the soil than just the small area where fertilizers are applied, fertility levels must be determined for the field as a whole to ensure that fertilizer applications are optimized to maximize crop yield and profitability.

Environmental issues are also involved. “If we are unable to determine the fertility of our field accurately because of the sampling method we are using, we may be applying more fertilizer than we need,” said Fernández. “A lot of the environmental issues have to do with phosphorus moving out of the fields as runoff from the soil surface.”

The study, conducted in Pesotum, IL., involved applying different rates of phosphorous/potassium blends in fall 2007 and 2009 before corn planting. Applications were broadcast-applied in no-till and strip-till and deep-banded at six inches below the surface in the crop row in strip-till. Fertilizer levels were measured every year at four-inch increments from the surface to a 12-inch depth, with samples collected at the row and at a distance of 7.5, 15, and 22.5 inches away from the row.

Results indicated that there was no need to adjust fertilizer rate based on tillage or fertilizer placement. Fernández explained that the plants send roots all over the soil profile, mostly in the surface layer, regardless of the fertilizer band. Thus, it does not really matter if fertility levels vary across the rows as long as the fertility level is sufficient for the crop.

What is important, however, is finding a way to estimate total field fertility when these differences occur. “The main message,” said Fernández, “is that for every time you take a sample where the fertilizer band is located, you need to take two or three samples outside of that band to make a composite sample to send off for analysis.”

This research, “Assessment of Soil Phosphorus and Potassium Following RTK-Guided Broadcast and Deep-Band Placement in Strip-Till and No-Till,” by Fabián Fernández and Daniel Schaefer, will be published in the May-June 2012 Soil Science Society of America Journal.

Leave a Reply

Fertilizer Stories

Aerial view of the West Fertilizer explosion site
FertilizerFertilizer Companies Blame City For West, TX, Explosion
August 6, 2014
El Dorado Chemical Co. and CF Industries contend the city failed to properly train the first responders and had insufficient protocols in place to battle the April 17, 2013, blaze at West Fertilizer Co. that triggered the explosion. Read More
FertilizerThe Fertilizer Institute: New President, Renewed Energy
February 3, 2014
Chris Jahn relishes the opportunity to lead the organization through the challenging times ahead. Read More
FertilizerA New Cycle For Fertilizer Demand
January 2, 2014
Changes in the corn market could have a major impact on the crop nutrients sector in 2014, say experts. Read More
FertilizerOSHA Hammers West Fertilizer With Over $100K In Fines For April Explosion
October 10, 2013
The Occupational Safety and Health Administration is fining the parent company of the West Fertilizer plant, Adair Grain Inc., $118,300 for 24 violations. Read More

Trending Articles

ManagementExpert To Discuss Farmland Value, Rent At Farm Science Review
August 18, 2014
While cropland values in Ohio increased in the past two years, they have remained flat in 2014, declining in some cases, according to an Ohio State University agricultural economist. Read More
EquipmentAdvance Your Technology IQ At MAGIE
August 13, 2014
The Midwest AG Industries Exposition (August 20-21) is the place you need to be to see, study and evaluate how new advances in the equipment, operations, crop protection and fertility sectors can help your business prosper. Read More
HerbicidesScouting Key To Next Season’s Soybean Herbicide Program
August 12, 2014
When growing soybeans, growers need to think ahead to stay one step ahead of weeds. That means examining weed threats and evaluating which herbicides work best. Read More
StewardshipMichigan Agriculture Leaders On Toledo Water Ban: We Want To Be Part Of The Conversation
August 8, 2014
Leaders of Michigan agricultural organizations said Thursday that the government should not have a “knee-jerk reaction” based on last weekend’s water ban in Toledo due to fertilizer run-off in Lake Erie. Read More
CropLife 100BRANDT Acquires Lemon Ag Services
August 4, 2014
The acquisition of Lemon Ag fits BRANDT’s aggressive corporate strategy of providing superior agronomic advice and services for customers in central Illinois. Read More
Eric SfiligojThe Resurgence Of Crop Protection
August 4, 2014
Plenty of new offerings over the next few years should see a rebirth for the crop protection products category in terms of market share. Read More

Latest News

CropLife 100Pinnacle Acquires California-Based Retailer
August 29, 2014
Pinnacle Agriculture Holdings will acquire Kerman Ag Resources, Inc., which will operate under Pinnacle's Performance Agriculture brand. Read More
Allied Cooperative Grain Plant
ManagementArcadia Co-op To Merge With Allied Cooperative
August 28, 2014
Allied Cooperative has announced that members of Arcadia Co-op voted in favor of a merger with Allied Cooperative, paving the way for the consolidation which will be effective on December 1, 2014. Read More
InsecticidesBioinsecticide VENERATE Now Registered In California
August 27, 2014
Marrone Bio Innovations' VENERATE is a new tool to help California growers control crop-damaging insect pests, fight the development of insect resistance and reduce pesticide residues on fruits and vegetables. Read More
CropLife 100Two Iowa-Based Ag Co-ops To Merge
August 27, 2014
The Board of Directors and management of United Western Coop, Missouri Valley, IA has completed a merger with Heartland Co-op, West Des Moines, IA, effective September 1, 2014. Read More
FertilizerKoch Expands AGROTAIN Nitrogen Stabilizer Portfolio
August 26, 2014
Koch Agronomic Services, LLC has added two new innovative nitrogen stabilizers to the AGROTAIN product family – AGROTAIN ADVANCED and AGROTAIN DRI-­MAXX. Read More
Seed/BiotechDuPont To Build Two Seed Treatment Centers
August 26, 2014
DuPont has announced construction on two state-of-the-art centers dedicated to developing and testing seed treatment formulations, applications and seed handling techniques in an important step toward bringing new solutions to growers. Read More
Seed/BiotechLoveland Products Acquires A Controlling Interest In Ag…
August 26, 2014
Loveland Products, a subsidiary of Agrium , has announced the company has acquired a controlling interest in Agricen, a Dallas-area agricultural biotechnology company delivering biochemical-based products for efficient and sustainable plant nutrition. Read More
StewardshipUp Close Look At The 2014 Environmental Respect Award W…
August 25, 2014
The 2014 Environmental Respect Award winners were honored recently at the 24th annual event in Wilmington, DE. Read More
Eric SfiligojAg Science Rejection Carries Consequences
August 25, 2014
As innuendo and fear dog the regulatory process, agriculture can’t get the new tools it needs to combat world hunger. Read More
LegislationFarmers Dismayed As New Farm Bill Dumps Direct Payments
August 25, 2014
The threatened end of cash subsidies to the nation’s row crop farmers dates back through at least the last two iterations of national agriculture policy legislation. Read More
MAGIE 2014 ShowStopper
EquipmentJohn Deere Again Wins MAGIE ShowStopper Award
August 25, 2014
For the second consecutive year, John Deere was honored at the Midwest AG Industries Exposition (MAGIE) for its new R4045 sprayer. Read More
CropLife 100GROWMARK CEO To Retire
August 22, 2014
GROWMARK chief executive officer Jeff Solberg has announced his retirement effective September 15, 2014. Read More
InsecticidesDuPont’s Prevathon Approved For Dry Beans
August 22, 2014
DuPont Prevathon insect control powered by Rynaxypyr has received EPA registration for foliar use on dry bean crops, including dried shelled peas and beans. Read More
ManagementNCGA DuPont New Leaders Program Enters Sophmore Season
August 20, 2014
The National Corn Growers Association and DuPont are pleased to announce the second year of the NCGA DuPont New Leaders Program. Read More
FungicidesVerdesian Links Up With Mitsui, Hokusan
August 20, 2014
Mitsui Chemicals Agro, Inc., and Hokusan Co., announced the signing of an exclusive licensing agreement allowing Verdesian Life Sciences global access to its patented technology for suppressing mycotoxin contamination in wheat and barley. Read More
SprayersUniversity Of Illinois Introduces New Spray App
August 18, 2014
University of Illinois Extension has released a new smartphone app for making sprayer-related calculations. Pesticide Spray Calculator, or Spray Calc, Read More
Crop InputsSyngenta Names New Manager Of Federal Government Relati…
August 18, 2014
Laura Wood Peterson has joined Syngenta as manager of federal government relations, based in Washington, DC. Read More
ManagementExpert To Discuss Farmland Value, Rent At Farm Science …
August 18, 2014
While cropland values in Ohio increased in the past two years, they have remained flat in 2014, declining in some cases, according to an Ohio State University agricultural economist. Read More