Managing Plant Nutrients When Both Manure And Fertilizer Applications Are Used

There are three main sources of plant nutrients available to farmers. They are commercial fertilizers, livestock manure and municipal sewage sludge or biosolids. There is a preconceived notion that a farmer will only use one of these sources to supplement nutrients supplied by soils. However, these sources can be used in combinations very successfully.

When considering the weight of material applied to soil, manures are the greatest, followed by fertilizers, and lastly biosolids. However, the actual amount of nutrients supplied with fertilizer is still highest because of their greater concentrations compared to organic sources. Typical liquid dairy manure has a fertilizer analysis of 0.4% N, 0.2% P2O5, and 0.5% K2O.

A typical fertilizer NPK fertilizer blend, used for a small grain crop, would have a blend analysis of 22-9-18 — or about 50 times greater concentrations of plant nutrients compared to liquid dairy manure. Fertilizers are much less expensive to transport compared to manure in order to supply the equal amounts of nutrients to a field. For this reason, the amount of nutrients supplied annually in the U.S. through fertilizer is 20 times greater compared to that applied as biosolids and manure combined. Plus, only a small percentage of cropland receives manure. In Canada, only about 4% of cropland receives manure applications compared to 96% that only receives fertilizer. This excludes some organic crop production land that receives neither manure nor fertilizer.

One disadvantage of only using manure compared to a combination of manure along with additional fertilizer is that the balance of nutrients can be less than ideal. For example, a barley crop yielding 100 bu/A (5,300 kg/ha) will take (per acre) 100 lb N, 42 lb P2O5, and 33 lb K2O from the soil. This equates to a N: P2O5: K2O use ratio of 2.7: 1: 0.8, which translates into a higher N requirement than can be supplied from typical manures. To better supply N, P and K to a barley crop, a farmer could apply additional N fertilizer along with manure to more closely approach the actual nutrient use ratio of the crop.

What can work well for farmers is to apply manure once every three years. In the year of application, manure is applied at a rate to supply the N requirements of the crop and excess P and K is supplied. For the next two years, only N fertilizer is required as residual P and K from the manure usually satisfies crop demand. Additional low rates of P and K might be used as seed-row starter fertilizer to get crops off to a good start under cool spring soil conditions. This approach works well to grow adequate yields while avoiding excess build up of soil P and K.

It is recommended that soil nutrient content be monitored annually or at least every three years, by having representative soil samples analyzed, and the results interpreted by a qualified consulting agronomist, or certified crop adviser. How often manure can be applied and what rates of fertilizer nutrients are required each year will need to be adjusted depending on the crop to be grown, crop yields, nutrient removal in harvested grain or forage, the manure type and its nutrient content and weather conditions. By using a combination of manure and fertilizer applications, crop nutritional needs can be met while avoiding excess levels of nutrients in your soil.

Source: IPNI Plant Nutrition Today

Leave a Reply

Crop Inputs Stories

FertilizerSimplot Introduces Fused-Safe Ammonium Sulfate Nitrate Fertilizer
May 31, 2016
The J. R. Simplot Co.’s new FŪSN fertilizer is now commercially available to growers. Simplot uses advanced technology to fuse Read More
Crop InputsRepar Registers New Biopesticide With U.S. EPA
May 31, 2016
Repar Corp., with headquarters in Silver Spring, MD, has developed Homobrassinolide 0.1%, a new generation plant growth promoter containing homobrassinolide, Read More
FertilizerCreating The Proper Environment For Yield Increases With Fertilizer Applications
May 31, 2016
Finely tuned nutrient management plans are helping farmers throughout the U.S. improve nutrient use efficiency, increase return on investment (ROI) Read More
Adjuvants loading
AdjuvantsISAA 2016 Highlights Adjuvant Trends
May 31, 2016
Adjuvants can significantly improve the performance of crop protection products. Farmers and formulators enhance the efficacy of sprays by using Read More
Trending Articles
Soybean Plant closeup
Industry NewsMonsanto Rejects Bayer Bid; Open To More Talks
May 25, 2016
Monsanto Co, the world’s largest seed company, turned down Bayer AG’s $62 billion acquisition bid as “incomplete and financially inadequate” Read More
Eric SfiligojPity The Monsanto Haters
May 23, 2016
An old saying goes thus: “Be careful what you wish for. You just might get it.” Given current events, there Read More
Monsanto Luling Plant
Crop InputsReport: Bayer Eyeing Monsanto For Possible Mega-Merger
May 16, 2016
Bayer AG is exploring a potential bid for U.S. competitor Monsanto Co. in a deal that would create the world’s Read More
Aerial Drone
Precision AgA Deeper Dive Into The Future Of Precision Ag
May 9, 2016
For about two decades now, through the good and the bad times, the ups and the downs inherent in agriculture, Read More
Palmer amaranth in soybean stubble
HerbicidesWSSA: Billions In Potential Economic Losses From Uncontrolled Weeds
May 4, 2016
What losses would corn and soybean growers experience if they were forced to eliminate herbicides and other control techniques from Read More
Eric SfiligojReasons For Hope In Commodity Prices
May 2, 2016
For many months now, the doomsayers have ruled the day in agriculture. Too much supply with too little demand would Read More
Latest News
FertilizerSimplot Introduces Fused-Safe Ammonium Sulfate Nitrate …
May 31, 2016
The J. R. Simplot Co.’s new FŪSN fertilizer is now commercially available to growers. Simplot uses advanced technology to fuse Read More
Growmark FS Outlet
StewardshipGROWMARK Recognizes Crop Specialists For Advocating Sus…
May 31, 2016
Five crop specialists who have excelled in engaging farmers in sustainable best management practices are the recipients of the GROWMARK Read More
Fertilizer Dealer Supply
UncategorizedFertilizer Dealer Supply Joins GVM
May 31, 2016
GVM has added Fertilizer Dealer Supply (FDS) to its growing network of Mako dealers. “I met Mark Anderson some 20 years Read More
Crop InputsRepar Registers New Biopesticide With U.S. EPA
May 31, 2016
Repar Corp., with headquarters in Silver Spring, MD, has developed Homobrassinolide 0.1%, a new generation plant growth promoter containing homobrassinolide, Read More
Industry NewsAligned Ag Distributors Names New VP Market Development
May 31, 2016
Aligned Ag Distributors LLC announced this morning the appointment of Tim Krueger to the position of VP Market Development. Krueger Read More
FertilizerCreating The Proper Environment For Yield Increases Wit…
May 31, 2016
Finely tuned nutrient management plans are helping farmers throughout the U.S. improve nutrient use efficiency, increase return on investment (ROI) Read More
Industry NewsJ.R. Simplot Names New Wholesale Agriculture Sales Vice…
May 31, 2016
Doug Stone will be joining the J. R. Simplot Co. as vice president, Wholesale Agricultural Sales within the Simplot AgriBusiness Read More
Adjuvants loading
AdjuvantsISAA 2016 Highlights Adjuvant Trends
May 31, 2016
Adjuvants can significantly improve the performance of crop protection products. Farmers and formulators enhance the efficacy of sprays by using Read More
Monsanto Luling Plant
Eric SfiligojWhat’s Next For Monsanto?
May 31, 2016
For the folks at Monsanto’s headquarters in St. Louis, MO, it has been an eventful few weeks. Back on May Read More
Craig Houin Sunrise Cooperative iPad
Precision AgState Of Precision Ag 2016: Gut Check Time For Value
May 31, 2016
There’s no denying that precision technologies and practices are more vibrant than ever. Equipment manufacturers have fine-tuned the hardware for Read More
ManagementWashington Visit and Bayer/Monsanto Deal Update
May 26, 2016
Editors Paul Schrimpf and Eric Sfiligoj discusses a recent trip to DC and the latest news on the proposed pairing Read More
Fertilizer closeup in hand
Industry NewsVerdesian: Striking A Balance Between Yield & ROI
May 26, 2016
Finely tuned nutrient management plans are helping farmers throughout the U.S. improve nutrient use efficiency, increase return on investment (ROI) Read More
Crop InputsLand O’Lakes Announces Minnesota Water Quality Pa…
May 25, 2016
Governor Mark Dayton and Land O’Lakes, Inc. President and CEO Chris Policinski today announced a new public-private partnership to protect Read More
Soybean Plant closeup
Industry NewsMonsanto Rejects Bayer Bid; Open To More Talks
May 25, 2016
Monsanto Co, the world’s largest seed company, turned down Bayer AG’s $62 billion acquisition bid as “incomplete and financially inadequate” Read More
Corn close up
Crop InputsArysta LifeScience Establishes Global Headquarters In R…
May 25, 2016
Arysta LifeScience has announced plans to relocate its global headquarters from West Palm Beach, FL, to Cary, NC, over the Read More
fertilizer blending and storage, Top 100
BlendersCHS Dakota Expansion Features AGCO’s GSI InterSys…
May 25, 2016
The continued growth of precision agriculture has increased farmer use of customized fertilizer blends best-suited for their soil conditions. Several Read More
ManagementAgriculture 3.5: A Bumpy Road Ahead
May 24, 2016
You may have read my article a few years ago on Agriculture 3.0, which is a term I coined to Read More
Topcon’s X30 display with CropSpec sensors
EquipmentGPS Autosteer Systems: Product Updates From Precision A…
May 24, 2016
Throughout 2015 GPS Steering solutions continued to evolve from what was once an after-market add on, to today’s cab where Read More