Pre-Sidedress Soil Nitrate Test Will Save Money On Nitrogen Fertilizer

UPDATED: April 12, 2013

Pre-sidedress soil nitrate test (PSNT) is an excellent tool to determine the available soil nitrogen (N) on fields that have a high N mineralization potential. These are fields that have a previous history of manure or alfalfa. Studies have shown that farmers could reduce their N fertilizer application rate on corn without risking yields if the test is properly carried out. With the price of N fertilizer rising, growers may be able to save an average of $50/A based on this test.

Some prep work is necessary to achieve the desired results from the PSNT. Here are some points to remember:

  • The test is ideally suited for fields with high N mineralization potential (i.e., fields with high organic matter, manure or legumes). Other fields that will have high nitrate levels are loam, clay loam and clay soils that have been heavily fertilized in previous years. The test measures both residual nitrate N from the previous year and recently mineralized N from organic matter.
  • No broadcast or incorporated preplant N fertilizer should be applied. A modest amount of starter N up to 40lbs/A could be band applied near the seed.
  • The greatest amount of available soil nitrate usually occurs in the soil once the soil has warmed up and about three to four weeks after corn emergence (V6 to V8 growth stage). At this stage, corn begins to take up N quite rapidly. This is the most appropriate time to apply sidedress N. Since N release from mineralization is an ongoing process, collecting PSNT soil sample as close to sidedress date gives the best information about the appropriate N credit. It takes a few days to collect the samples and get them analyzed.
  • Soil samples taken earlier will not give a full measure of mineralizable N. Therefore, the amount of N credit will be smaller.
  • Soil cores should be taken midway between the corn rows, avoiding the starter fertilizer band. The sampling depth is 12 inches. Each sample should be a composite of 15 to 20 soil cores and represent no more than 20 acres.
  • Air-dry the sample in paper bags near a fan or heated air vent. Drying the sample is very important. Do not place soil in plastic bags.
  • The test will measure the nitrate concentration in parts per million (ppm). The critical level is 25 ppm, above which no N fertilizer is recommended. When the concentration is below 25 ppm, the N fertilizer recommendation is adjusted accordingly.

For more information, see Michigan’s Soil Nitrate Test for Corn.

Leave a Reply

One comment on “Pre-Sidedress Soil Nitrate Test Will Save Money On Nitrogen Fertilizer

  1. Great article! Solum has created a mobile tool for measuring nitrates in soils. This tool is designed to help services providers support the in-seasons PSNT market. We also just released a mobile app to help our customers provide even faster end-to-end support. The app is available on iOS http://tinyurl.com/b5su2ro and Android http://tinyurl.com/avo93d5 
 If anyone is interested, feel free to call 1-855-GO-SOLUM to find a service provider near you.

Fertilizer Stories

FertilizerNutrient Management, Conservation Among Topics Covered At Indiana CCA Conference
November 23, 2016
Certified crop advisers, consultants, farmers, agribusiness professionals and students will learn more about nutrient management, soil and water conservation, pest Read More
NutriSphere-N Application
Crop InputsVerdesian: NutriSphere-N Making A Water Quality Difference In Midwest
November 18, 2016
Farmers sitting on the largest aquifer in the United States have learned a thing or two about managing nitrogen (N) Read More
FertilizerThe Fertilizer Institute Issues Statement On The U.S. Elections
November 10, 2016
The Fertilizer Institute (TFI) President Chris Jahn has issued the following statement on the results of the 2016 elections: “TFI Read More
Fertilizer Storage
FertilizerThe Fertilizer Institute Hires New Director Of Agronomy
November 4, 2016
The Fertilizer Institute (TFI) has hired Dr. Sally Flis as its director of agronomy, a new position created to support Read More
Trending Articles
R4023 Sprayer, John Deere
CropLife 100Ag Retail Equipment Report: The Green Party Continues
December 7, 2016
In the annual race for sales in the ag retail equipment marketplace, the color schemes for participants are a little Read More
Mike Stern
Precision AgClimate Corp. CEO Talks Retailer Support For Digital Ag
December 1, 2016
CropLife Magazine’s sister publication, AgriBusiness Global, recently sat down with Mike Stern, CEO of The Climate Corp., following the Monsanto subsidiary’s Read More
Precision AgTrimble Debuts End-to-End FMIS Platform
November 28, 2016
October’s inaugural PrecisionAg Vision Conference left this author with many thoughts and things to ponder in the coming months. Probably Read More
CHS Primeland
CropLife 100The 2016 CropLife 100 Report: Reviewing The Many Bulls And Bears Impacting This Year’s Marketplace
November 28, 2016
For virtually all of 2016, the nation was wholly focused on the big Presidential election. Some folks aligned themselves with Read More
Monsanto sign
Crop InputsMissouri Governor Meets With Bayer CEO To Discuss Monsanto Merger
November 21, 2016
Missouri Gov. Jay Nixon visited Bayer AG global headquarters in Leverkusen, Germany, on November 18 to discuss the proposed Bayer-Monsanto Read More
STS16 2017
SprayersHagie Manufacturing Releases 2017 STS16 Sprayer To Market
November 16, 2016
Hagie Manufacturing LLC’s largest full season applicator is now available with enhancements for the 2017 model year. Hagie is officially Read More
Latest News
ManagementARA 2016 Report and Crop Mix for 2017
December 9, 2016
Editors Paul Schrimpf and Eric Sfiligoj talk about the recent Agricultural Retailers Association meeting and the projected acreage mix for Read More
AgriSync
Matt Hopkins17 Agriculture Apps That Will Help You Farm Smarter In …
December 9, 2016
Ag professionals are working smarter, not harder, than ever before. Smart farming technologies have enabled them to reduce costs, maximize Read More
Ryan Bartlett
Crop InputsCompass Minerals Appoints Vice President, Innovation An…
December 8, 2016
Ryan Bartlett, Ph.D., has joined Compass Minerals as vice president, innovation and product development. Dr. Bartlett will be responsible for Read More
HerbicidesHerbicides 2017: New Cropping Systems Set For Debut
December 7, 2016
Herbicide-resistant weed are inching ever-closer to a potentially frightening saturation point here in the U.S. Heading into 2016, USDA planting Read More
CropLife 100Wilbur-Ellis Acquires Michigan Ag Retailer
December 7, 2016
Wilbur-Ellis’ Agribusiness, a recognized leader in precision agriculture technology and the distribution and marketing of plant protection, seed and nutritional Read More
Fertilizer storage The Andersons
CropLife 1002016 Fertilizer Report: Another Really Rough Year For A…
December 7, 2016
In many ways, the fertilizer category cannot seem to catch a break. During the early part of the 2010s decade, Read More
R4023 Sprayer, John Deere
CropLife 100Ag Retail Equipment Report: The Green Party Continues
December 7, 2016
In the annual race for sales in the ag retail equipment marketplace, the color schemes for participants are a little Read More
Winter wheat
HerbicidesTalinor Herbicide Approved For Wheat And Barley
December 7, 2016
Talinor herbicide from Syngenta has received federal registration from the U.S. EPA, giving wheat and barley growers a new option Read More
Forage Sorghum
UncategorizedMilestone Achievement Continues For Dow AgroSciences, A…
December 7, 2016
New and innovative forage products are on the horizon driven by continued collaboration between Dow AgroSciences, a wholly owned subsidiary Read More
Palmer pigweed seedhead in cotton
HerbicidesNew WSSA Factsheet Explores Weed Seeds And Their Longev…
December 7, 2016
Did you know some weed seeds can lie dormant in the soil for more than a century and then sprout Read More
Crop InputsARA 2016: 5 Developments Worth Monitoring Into 2017
December 6, 2016
You can pretty much set your watch to it (do people even still wear watches? I know I do…but I’m Read More
Tim McCardle, ARA Chairman
CropLife 100BRANDT COO Named ARA Chairman
December 5, 2016
BRANDT EVP and Chief Operating Officer Tim McArdle has been named chairman of the Agricultural Retailers Association (ARA) during a Read More
Crop InputsWilbur-Ellis Receives ResponsibleAg Certification At Mo…
December 5, 2016
Wilbur-Ellis Co., a recognized leader in precision agriculture technology and the distribution of crop protection products, announces the ResponsibleAg certification Read More
Young Corn Closeup
Eric SfiligojThe Read On 2017 For Agricultural Fortunes Is Anybody’s…
December 5, 2016
As I (and others) have written in recent months, the nation has just experienced one of the most offbeat election Read More
Acceleron B-300 seed coating
Crop InputsThe BioAg Alliance Launches New Yield-Boosting Microbia…
December 5, 2016
As part of their commitment to develop and commercialize innovative microbial solutions for farmers through The BioAg Alliance, Monsanto Co. Read More
ManagementCorn and soy planting update; Takeaways from Climate Co…
December 2, 2016
AgriBusiness Global Editor Dave Frabotta Joins Paul Schrimpf for a discussion of global corn and soybean planting trends, and a Read More
Radish cover crop taproot
Crop InputsSoil Health Institute, Datu Research Receive Grant To E…
December 1, 2016
The Soil Health Institute (SHI) and Datu Research have announced a $626,000 grant from the Walton Family Foundation to quantify the Read More
Mike Stern
Precision AgClimate Corp. CEO Talks Retailer Support For Digital Ag
December 1, 2016
CropLife Magazine’s sister publication, AgriBusiness Global, recently sat down with Mike Stern, CEO of The Climate Corp., following the Monsanto subsidiary’s Read More