Since 2008 I have served as the Precision Nutrient Management Extension Specialist for Oklahoma State University. I work in Wheat, Corn, Sorghum, Cotton, Soybean, Canola, Sweet Sorghum, Sesame, Pasture/Hay. My work focuses on providing information and tools to producers that will lead to improved nutrient management practices and increased profitability of Oklahoma production agriculture

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Saline and Sodic Seep Renovation A potential Positive Impact of Drought

This article is written by Dr. Jason Warren, OSU Soil and Water Conservation State Extension Specialist. 

The drought has caused numerous negative impacts on Agriculture in Oklahoma.  However its impact on our ability to renovate some types of Saline and/or Sodic soils has been a positive.  Saline and sodic seeps are referred to by many names, including: salt spots, alkaline spots or slick spots.  They are all similar in that they contain excessive amounts of salt or sodium that prevent plant growth.  However there are various differences that influence how we renovate these sites.

These areas are classified by the amount and type of salt present.  Saline soils are those that contain an EC greater than 4000 μmhos/cm and less than 15% Exchangeable sodium.  A Saline/sodic soil contains an EC greater than 4000 μmhos/cm and greater than 15% exchangeable sodium. Lastly, the Sodic soils contain less than 4000 μmhos/cm and greater than 115% exchangeable sodium.  Given these differences it is important to have soils from these barren areas tested before a renovation plan is developed.  The soil tests will provide recommendations for renovation and more detail on these strategies can be found in factsheet PSS-2226.

Beyond the classifications briefly mentioned above there are different ways in which these saline and sodic soils form.  Some of these soils are formed from parent material that contained excessive salt or sodium.   Others are formed when ground water moves to the surface through evaporation and deposits salt as the water is lost to the atmosphere.   The drought conditions we are current experiencing can impact our ability to renovate the latter.




Figure 1: The upper picture was taken in Feb. 2011 and the bottom picture was taken in April 2013.

Hydraulic seeps, those formed from the movement of groundwater to the surface, are often found in low lying areas of the landscape where the groundwater is close enough to the soil surface that water can be conducted through capillary force to the soil surface.  These forces are similar to those that allow use to suck water up through a straw but in the case of a saline seep evaporation from the soil surface provides the hydraulic gradient that pulls water from the water table.  The drought has caused the water table in many areas to subside and become too deep for these force to pull water to the surface and deposit salts.

Figure 1 shows a saline/sodic soil in 2011 and again in 2013.  This site had been treated with Gypsum as described factsheet PSS -2226 in 2007.  However, because of a shallow water table that persisted until the onset of drought in 2011 the renovation effort was not successful because there was insufficient movement of water through the profile to leach the salts down out of the soil surface.   These soils are in proximity to Stillwater Creek and Lake Carl Blackwell.  The water table has declined which allows limited rainfall experienced at this site in 2012-13 to move the salts down out of the soil surface.  This in turn has allowed crop establishment further improves water infiltration by protecting the soil from crusting.

The drop in most water tables across Oklahoma, particularly western Oklahoma where these salt spots are most common, provides for a unique opportunity to renovate hydraulic salt spots.  Again the first course of action is to collect a soil sample to determine what types of salts are present.  You can also make an effort to determine how the salt spot was formed.  This information can be found on the soil survey at http://websoilsurvey.sc.egov.usda.gov/App/HomePage.htm.  Your county extension educator or local NRCS can help to interpret this information.

We have observed that our success in renovating a hydraulic seep near Stillwater was greatly improved during this period of drought.  However, given the fact that our sub soils are generally dry throughout Oklahoma, which improves our ability to leach salts, the drought should improve our ability to renovate those formed from parent material as well.

Time to start topdressing wheat


My favorite part of the blog “Don’t have an N-Rich Strip? It’d be a lot cooler if you did.”

Originally posted on World of Wheat:

There are few crop inputs that deliver as much return on investment as nitrogen fertilizer. It takes approximately two pounds of nitrogen, costing approximately $1.00, to produce one bushel of grain worth about $5.00. Of course, nitrogen is not the only yield determining factor in a wheat crop. Also, the law of diminishing marginal returns eventually kicks in, but nitrogen fertilizer is still one of the safest bets in the house.

Top dress nitrogen fertilizer is especially important because it is applied and utilized at a time when the plant is transitioning from vegetative to reproductive growth. Several things, including the number of potential grain sites, are determined just prior to jointing and it is imperative that the plant has the fuel it needs to complete these tasks. Jointing also marks the beginning of rapid nitrogen uptake by the plant which is used to build new leaves, stem, and the…

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Agriculture Apps, 200 strong and growing

It was just 11 months ago when I wrote my last blog on Ag apps.  Since that time I have presented on the topic several times, added nearly 100 new apps, have filmed several designated segment on sunup featuring apps (these can be seen at http://www.youtube.com/osunpk), and released two (soon to be three) apps myself.  Below is the introductory slide I have been using in all of my app talks, on this slide you can see how the number of apps have been increasing overtime. In this update I wanted to share some of the new sections I have added to manage the vast number apps and go through some of my favorite apps in each of the sections.


Finding the right app has not changed as I still just give an app 3 minutes before a keep or drop decision is made, however since a year ago some of the key words are now less useful.  For example a search for wheat will bring up droves of gluten free diet apps.  None of these fit the bill for what I am looking for. Though out the blog you can click on pictures screenshots to get a better view of the app buttons.

Ag News and Weather

Ag News

Still a very large section with little change for my recommendations, just go with what suits you in layout and reporting.  I personally use RonOnRON (Ron Hays, the voice of Oklahoma Agriculture), DTN/PF, AG/Web, and AgWired.


Ag Resources

Ag Resources

This includes peer review publications, resource guides and extension materials.




The majority of the Calculator apps preform relatively simple functions without the need of cellular or wifi connectivity. The Ag PhDs have two apps in the section I want to highlight, HarvestLoss and Fert. Removal. Both apps are useful tools in making management decisions. HarvestLoss allows the user to calculate the economic loss of a poorly set combine while Fert. Removal allows the user to select from a wide range of crops and see an exit ate of nutrient removal based upon selected yield level. Other useful apps are Growing Degree which allows the user to see cumulative heat units a crop has received anywhere in the US, Corn Yield Calc estimates corn yield based on ear girth and length, Canola Calc is a great apps produced by Pioneer which calculates the proper planting rate of canola based upon several factors and the Kansas Wheat Yield Calculator KWYC, uses growth stage stalk counts, height and/or NDVI to estimate potential grain yield.


Crop Tools

Crop Tools

This section is filled with University Extension handbooks such as Purdue’s Field Guide ($12.99), University of Arkansas Corn Advisor, University of Kentucky Corn Production, and one private groups MFA Agronomy. Each of these guides are quality apps and should be chosen based upon geography or personal preference. The university apps mirror their respective hard copies however UK’s app added a nice update section highlighting local Ag news. MFA’s app is strong in pesticides with good herbicide performance data.




For any producer who regularly applies animal waste the Manure Calc by the University of Nebraska is a great tool. The University of Wisconsin has a nice app in N Price Calculator and the Saskatchewan Soil Conservation association (SSCA) has created a nice fertilizer blend app. Oklahoma State University has Ammonia Loss Calculator which uses soil pH and environmental conditions to estimate N losses from surface applied urea.



I am also getting into the app game with two recently released apps the Canola Starter and Field Guide. Canola Starter provides a recommendation for safe starter rates based on row width and fertilizer source. Field Guide is app version of my Nutrient Management Field Guide, this app includes a nutrient removal calculator, nutrient deficiency ID tool, and fertilizer rate calculators. Along with these I have several in the wings with titles like Crop Nutrients in Irrigation, GDDs>0, and Wildlife FoodPlot.

ID Tools

ID Tools

As mentioned in my first two blogs the University of Missouri’s IDWeeds app was the first taxonomy based weed identification tool. I still use it regularly but both BASF and Monsanto have brought products to the table, both named WeedID, that are very user friendly and effective. Plant Images ($5.00) is a library of nutrient deficiency photos from a large selection of crops. Years and Ag PhDs also have apps available with deficiency images named Yara Checkit and Crop Nutrient Deficiencies. Cereal Disease ID app by BASF is intended for the UK and DuPonts Pestbook for Australian cotton farmers but I find that both can be very useful even in Oklahoma.

Pay to Play, Registrations

Pay To Play

I have heard several good things about many of these apps.  However they reguire the user to either be an employee or patron of the company or online registration. In a pay to pay app I would expect an all inclusive tool that could replace several free apps and preform record keeping duties.



To be honest this is not a section I use much as I do not have an operation to maintain records on. However just by walking through the apps Crop Calculator by the University of Wisconsin and Pesticide Recordkeeping (PeRK) by University of Nebraska.



This section has apps that I classify as decision aid tools that could be used by someone scouting crops and apps that can be used to map and or collect field notes. South Dakota State has two great tools in Soy Diseases and NPIPM Soybean Guide.    Scout and Sirrus.

Seed Select


Company based, Pioneers app products are some of the best with Plantability and Estimator

Sprayer Chemical


Some things haven’t changed I still use Tank Mix Calc and Spray Select on a very regular basis. But over the past year a few companies have added product finders and Clemson University has released a very nice sprayer calibration app named Calibrate.



The last two apps are Mesonet and Climate Corp Basic. You will notice the background on the screen shot is slightly different. That is because neither of these apps is kept Ina folder, both are on my home screen. Whether it is rain, temp, or wind weather impacts all aspects of agriculture therefore these two apps are always within one tap. For any producer in Oklahoma the Mesonet is an amazing system with 120 automated weather stations spread evenly across the state. This app just provides this data with just a few swipes of the finger. For those outside of Ok Climate Basic allows producers to first save field of interest and then monitor rainfall and environmental conditions of each field. While not extremely accurate it is defiantly close enough for those with a wide territory to be a very handy app.
For more information and some screen shots of the apps in action either visit my website http://npk.okstate.edu/presentations or my YouTube site http://www.youtube.com/osunpk under the playlist OSU_NPK on Sunup.

How to make $100,000 in a day


This is a familiar soap box. SOIL SAMPLE, SOIL SAMPLE, SOIL SAMPLE.

Originally posted on World of Wheat:

No, this blog post is not about a get rich quick scheme, but there is a way for the average wheat farmer in the southern Great Plains to add $50,000 to $100,000 to the bottom line in a single day. Most soil tests I have pulled this summer have shown 50 to 90 lb/ac of NO3-N in the top 18 inches of soil. Ninety pounds of N equates to about $45 of N fertilizer, and this knowledge could save a 2,500 acre wheat farmer in excess of $100,000 in fertilizer cost. Soil testing is laborious, but the potential economic returns for spending a day or two soil sampling are outstanding.

There is still time to soil sample. Soil samples only take a few days to process once they are in the OSU lab. It is not unusual for transit time to the lab to the slowest part of the process…

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Nutrient Products: Stabilizers, Enhancers, Safeners, Biologicals and so on.

In this blog I am not going to tell you what to use or what not to use. In fact I will not mention a single product name. What I will do is hopefully provide some food for thought, new knowledge and direction.

First I want to approach a topic I have been called out on several times. I believe there is a stigma that University researchers and extension specialists do not want products to work.  It may seem that way at times but it is far from the truth. The reality is that all of us are scientists and know someone may be inventing the product that changes nutrient management as we speak.  The issue is that most of us have been jaded. While I may be younger I have over 11 years experience, testing “products” in the field, and that includes dozens of products. I have sprayed, spread, tossed, drilled, mixed and applied everything under the sun, with  hopes that I will see that one thing I am always looking for, MORE GRAIN…

The truth is Everything works Sometimes yet Nothing works ALL the time. I and others in my profession do not expect anything to work 100% of the time, I am personally looking for something that will provide a checkmark in the win column 50% of the time. A win is the result of one of two things, more money in the producers pocket or less nutrients in the water or air.  Products can increase vigor, nutrient uptake, chlorophyll concentration, greenness but not yield. What Co-op or elevator pays for any of those attributes?  Grain makes green.


snake-oil snake_oil_ad 60-60168_MECH










So many safeners, stabilizers, enhancers, biologicals, and on and on are available, so what should a producer do?  Here are few things to think about. Ask yourself “ what part of my nutrient management plan can I get the most bang from improving”?

If the answer is Nitrogen (N) there are three basic categories: Urease inhibition, Nitrification inhibitor, and slow release. All are methods of preventing loss; the last two are preventing loss from water movement.

Urease inhibitors prevent the conversion of Urea to NH3 (ammonia). This conversion is typically a good thing, unless it happens out in the open.  Ideally any urea containing product is incorporated with tillage or rain. However, in No-till when urea is broadcast and no significant rainfall events (>0.5”) occur, N loss is likely. The urea prill starts dissolving in the presence of moisture, this can be a light rain or dew, and urease starts converting urea into NH3. As the system dries and the day warms, if there was not enough moisture to move the NH3 into the soil the wind will drive NH3 into the atmosphere. Nitrogen loss via this pathway can range from 5% to 40% of the total N applied.


Graphic of Urea's conversion to plant available ammonium.

Graphic of Urea’s conversion to plant available ammonium.

Wet Soil

Urea placed on a wet soil under two different temperatures. Number in white is hours after application.

Dry Soil

Urea placed on a dry soil, on top no water added, bottom left is moisture from the subsurface, and bottom right is simulated rain fall of 1/2″. Number in white is hours after application.












Nitrification inhibitors prevent the conversion of NH4 into NO3.  Both are plant available N sources but NH4 is a positively charged compound that will form a bound with the negatively charged soil particles.  Nitrate (NO3) is negatively charged and will flow with the water, in corn country that tends to be right down the tile drainage.  Nitrate will also be converted to gasses under wet water logged soil conditions. Nitrate is lost in the presence of water, this means I do not typically recommend nitrification inhibitors for western OK, KS, TX dryland wheat producers.

Slow release N (SRN) comes in a range of forms: coated, long chain polymer, organic and many versions in each category.   Again, water is the reason for the use of SRN sources. Slow release N whether coated or other have specific release patterns which are controlled by moisture, temperature and sometimes microbes.  The release patterns of SRNS are not the same and may not work across crops and landscapes. For instance in Oklahoma the uptake pattern of nutrients for dryland corn in the North East is not that same as irrigated corn in the West. The little nuances in the growth pattern of a crop can make or break your SRN.

While N products have been on the market for decade’s phosphorus enhancers and stabilizers are relatively new, resulting in many of my peers holding back on providing recommendations until field trials could be conducted. At this point many of us do have a better understanding of what’s available and are able to provide our regional recommendations.  Phosphorus products are not sold to prevent loss like their N counterparts; they are sold to make the applied P more available. On a scale of 1 to 10, P reactivity with other elements in the soil is a 9.9.  If there is available Ca, Mg, Fe, or Al, phosphorus is reacting with it.  In the southern Great Plains it is not uncommon for a soil to have 3,000-5,000 lbs of available Ca, a soil with a pH of 4, yes we have many of those, will have approximately 64,000 lbs of Al in the soil solution.  That’s a lot of competition for your fertilizer P and for any substance that is trying to protect it.

I have been testing “biologicals” of all shapes and forms since 2003.  While I have not hit any homeruns I have learned quite a bit.  Many of these products originate from up north where the weather is kind and organic matter (OM) is high.  Where I work the average OM is 0.75% and soil temp is brutal and unforgiving.  Our soil does not have many reserves to release nor is it hospitable to foreign bodies.

Soil temperature for Stillwater OK under sod and bare soil conditions.  Graph from www.Mesonet.org.

Soil temperature for Stillwater OK under sod and bare soil conditions. Graph from http://www.Mesonet.org.

I hope you are still hanging on as this next topic is a bit of a soap box for me.  Rate, Rate, Rate this aspect is missed both by producers and academia and it drives me crazy.  If your crop is sufficient in any growth factor adding more will not increase yield.  It goes back to Von Liebig’s LAW of the Minimum.  I see too many research studies in which products are tested at optimum fertilization levels.  This is just not a fair comparison.  On the other hand, time and again I see producers sold on a product because they applied 30% less N or P and cut the same yield.  If you let me hand pick 100 farms in Oklahoma I could reduce the N rate by 30% of the average and not lose a bushel on 75 of the farms.  Why? Because the rate being used was above optimum in the first place, there is no magic just good agronomy.  The list of products that increase the availability of nutrients is a mile long. Increasing nutrient availability is all well and good if you have a deficiency of one of those nutrients.  If you don’t, well you have increased the availability of something you did not need in the first place.

University researchers and extension professionals seem to live and die by the statistics, and are told so regularly. We do rely upon the significant differences, LSD’s, and etc to help us understand the likely hood of a treatment causing an effect.    However if I see a trend develop, or not develop, over time and landscape regardless of stats I will have no problem making recommendations.    The stats help me when I do not have enough information (replications).

Too wrap up, have a goal.  Do not just buy a product because of advertised promises or because a friend sells it.  There is a right time and place for most of the things out there, but you need to know what that is and if it suits your needs.  I also recommend turning to your local Extension office.  We do our best to provide unbiased information in hopes of making your operation as sustainable as possible.  If you are looking at making sizable investments do some reading, more than just Google.  Testimonies are great but should but should not be enough to cut a check. Google Scholar www.google.com/scholar is a good resource for scientific pubs.  I have done my best to put together a list of peer reviewed publications and their outcomes.  To make the review work I had to be very general about outcome of the research.  Either the product increased yield or decreased environmental losses or it had no impact.   This was not easy as many of the papers summarize multiple studies.  I did my best to make an unbiased recommendation but some could be argued.    http://npk.okstate.edu/Trials/products/Product_Peer_Review.8-21-2014.pdf


2013 Wheat and Canola preplant soil test results

Every few years I request the results of all soil samples submitted to OSU Soil, Water, & Forage Analytical Labs (www.soiltesting.okstate.edu) under the crop codes of winter wheat and winter canola.   Within this data set I can look at trends occurring across the state over time.  In this report I will focus on the 2013 results but make some comparison with the 2011 sample values.

As it pertains to mobile nutrients such as N, S, and B there is little that can be applied from the previous year’s soil samples because their levels in the soil change rapidly.  Samples must be collected every year to determine the current status.  However the soil test levels of immobile nutrients, P, K, Mg, ect are relatively stable over time and the recommendation is to take a close look at these values every three to five years.

In 2013 the number of sample submitted increase.  There were nearly 1000 more wheat soil samples (2733 to 3574) and 200 more canola soil samples (33 to 231).  If the distribution of nutrient levels of the two years are compared the only significant change is that the soil test NO3 level was significantly lower in 2013 (Tables 1 and 2).  This is attributed to the extremely dry 2012 spring and summer which delayed the breakdown of wheat straw and immobilization of residual N.


Table 1 and 2. Summary from all samples submitted to SWFAL under the wheat and canola crop codes in 2001 and 2013.

Table 1 and 2. Summary from all samples submitted to SWFAL under the wheat and canola crop codes in 2001 and 2013.


Reviewing the 2013 values the most concerning aspect is that 72% of the 3800+ soils samples had a Mehlich 3 P value below optimum soil test phosphorus (STP) of 65 (Figures 1 and 2). That adds up to 109,000 acres needing phosphorus, if you assume each sample represents 40 acres.    There is no way to determine how much P2O5 if any was applied to these particular fields.  However, an estimated impact of not fertilizing can be calculated.   Based on the Oklahoma typical average yield of just below 40 bpa, it would cost the state approximately 575,000 bushels if the land went unfertilized.  At $5.00 a bushel that is $2.8 million in revenue.  To remedy the low STP it would take approximately 2.76 million lbs P2O5 at a cost of $1.5 million ($0.50 per lb).

In the NPKS response study wheat fields across the state were evaluated for a response to additional (in addition to producer’s standard practice) nitrogen, phosphorus, potassium, and sulfur.    Phosphorus was the most limiting nutrient at 7 of the 59 harvest locations.  A response to P occurred more often than any of the other nutrients tested.   It is important to note at all seven fields had been fertilized with P that season, however each time it was below the OSU recommended rate.   The response study was a great reminder that it is important to have a good soil test and to follow the recommendations.



Figures 1 and 2. 1)Range of soil test P levels (Mehlich 3) for all samples submitted to SWFAL in 2013 under the wheat and canola crop codes. 2) Range of Soil Test P level for all samples with STP<65.

Figures 1 and 2. 1)Range of soil test P levels (Mehlich 3) for all samples submitted to SWFAL in 2013 under the wheat and canola crop codes. 2) Range of Soil Test P level for all samples with STP<65.


Soil pH on the other hand showed a slight improvement from 2011. The percent of samples under 5.5 decreased by 4%, 25 to 21. Of the samples <5.5 the majority fall within the 5.0-5.5 category, which for winter wheat is still within the optimum growth window (Figures 3 and 4).  These numbers are a good sign however two points should be made.  There is a significant amount of winter wheat acres that is not sampled; much of this is likely to fall below 5.5 soil pH.


Figures 3 and 4. 1)Range of soil pH levels  for all samples submitted to SWFAL in 2013 under the wheat and canola crop codes. 2) Range of soil pH levels for all samples with pH<5.5.

Figures 3 and 4. 1)Range of soil pH levels for all samples submitted to SWFAL in 2013 under the wheat and canola crop codes. 2) Range of soil pH levels for all samples with pH<5.5.


Additionally grid soil sampling and variable rate lime should consider on any field which the composite soil sample pH ranges from the high 4’s to the high 5’s.  For example a 75 ac field near Deer Creek had a composite soil sample test pH of 5.3 and buffer index of 6.5.  The OSU lime recommendation, for a wheat crop, was 2.2 ton per acre for a total of 166 tons to lime the entire field.  However the producer grid soil sampled the field himself at a 2.5 acre resolution (31 samples).  Figure 5, shows that the pH of the field ranged from 4.4 to 7.9.  Only 33 tons of lime would be required if the field were limed using a variable rate technologies.   Cutting the total amount applied by 133 tons would save the producer approximately $4000.


Figure 5. Soil pH results from a 75 acre field that was grid soil sampled at a 2.5 ac resolution.

Figure 5. Soil pH results from a 75 acre field that was grid soil sampled at a 2.5 ac resolution.


Oklahoma wheat and canola producers must take advantage of the weather when it goes their way.  Yet if the crop does not have the proper soil pH and nutrients under it, it will never reach its potential.  Take the time to collect a soil sample and send it in to a lab. The hour it takes to collect the sample a few dollars you spend on analysis will help ensure that crop you are producing has the best chance of hitting maximum yield in the most economically and environmentally sound manner.


Related Factsheets

OSU Soil Test Interpretations


Fertilization Based on Sufficiency, Build-up and Maintenance Concepts






2014 Harvest has wrapped up.

The last of the Precision Nutrient Management winter crop harvest was wrapped up in Chickasha June 25.  Across the trial locations (Lahoma, Perkins, Chickasha, and Stillwater) the yields came in across the board in the high teens low twenties, bushel per acre.  For most of the trials there was very little treatment difference, often the check ( Zero N) was not far from the fertilized plots.  At this time the students are processing the grain.  Some will be sent to a NIR Spectrophotometer for protein analysis the rest will be ground and analyzed for nitrogen and mineral content.  The response to fertilizer was so low this year many of my trial areas have a double crop sorghum growing, in hopes to take advantage of the recent rains and harvest the residual nutrients.  While I am processing the data and the students are running the samples I thought I would share a few of the images from the 2014 harvest.  I will post results on the npk.okstate.edu as the become available and share the information on this blog.   The best way to learn when results are posted are to follow me on Twitter @OSU_NPK or subscribe to our Extension news list serve (send me an email at b.arnall@okstate.edu to be added to the listserv).

This harvest was spent watching the radar and going where the weather allowed.

This harvest was spent watching the radar and going where the weather allowed.

Even a new machine needs a few in field "Modifications"

Even a new machine needs a few in field “Modifications”

In this you can see the impact of fertility on freeze damage.  The dark plots survived the freeze, the light did not and were full of smaller tiller heads.  In the end no major yield differences.

In this you can see the impact of fertility on freeze damage. The dark plots survived the freeze, the light did not and were full of smaller tiller heads. In the end no major yield differences.

The view from the driver seat of the Massey 8XP, with the Harvest Master on the right.

The view from the driver seat of the Massey 8XP, with the Harvest Master on the right.

Even with a 5 ft header residue management is important.

Even with a 5 ft header residue management is important.

While all plots are cut with the 8XP, for cleanup we borrowed a few Gleaners when available.

While all plots are cut with the 8XP, for cleanup we borrowed a few Gleaners when available. I liked to say we started with Young and Cute and finished with Mature and Efficient.

To beat the rains all of us at OSU ran late nights and weekends.

To beat the rains all of us at OSU ran late nights and weekends.

When possible we like to let students get as much experience as possible.  In this a Brazilian intern Luciano is learning to run the 8XP.

When possible we like to let students get as much experience as possible. In this a Brazilian intern Luciano is learning to run the 8XP.

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