July 31, 2019

Feed for Thought

The weather conditions in the Midwest has been a challenge for all of agriculture, including those in the livestock industry and forage producers. Wet weather, small harvest windows, and severe winters have all had a profound effect on the availability of and the quality of forage products available to livestock producers.

Forage crops are a cornerstone of many livestock feeding programs. However, to get the most benefit from the forage, it is critical to know the nutritional value of the material so that a proper nutritional program can be developed around that forage. Forage testing can provide this valuable information. However, a good forage analysis begins with proper sampling technique.

A quality feed sample should be as representative of the lot as possible, and that lot should be constituted of relatively uniform materials. For example, it is best to sample each cutting of hay separately, as the quality and composition of the feed can be affected by a number of factors, such as weather, moisture content at harvest, and maturity of the crop. To collect a forage sample, collect sub samples from different bales within the lot and combine them together to make up your sample. More detailed information on how to collect samples from different types of forages can be found in our sampling guide, available on our website or by clicking here.

A question that we often get here at the lab is "is my hay any good?" Different things make a good quality hay to different people in different situations: what one person considers good is not necessarily what someone else would consider good. Analyzing your forages gives you the information necessary to see how that forage fits into an overall feeding program. By working with an animal nutritionist, you can then tailor a feeding program to meet the needs of your particular operation.

July 31, 2019

Compost Seal of Testing Assurance (STA)

Compost analysis has become an integral part of our testing business.  It is an area that has consistently grown over the years mainly because of the U.S. Composting Council’s (USCC) Seal of Testing Assurance (STA) program and the fact that compost utilization is increasing as users discover the benefits of composting and using compost.  



What is “STA”?
The Seal of Testing Assurance Program is a compost testing, labeling and information disclosure program designed to provide information to compost producers or users so that they can get the maximum benefit from the use of compost.  The program was created in 2000 and is the consensus of many of the leading compost research scientists in the United States.  A&L Great Lakes Laboratories, Inc. has been working with the USCC for many years, and we were one of two independent laboratories who worked with the United States Department of Agriculture (USDA) on the validation of the USCC testing methods.
We are a certifying laboratory for the Composting Council’s Seal of Testing Assurance (STA) program.  We analyze composts from throughout the United States, and have had the opportunity to analyze compost samples from Mexico, Central America, Europe and some Caribbean islands. 

What Methods Are Used?
In order to keep quality consistently high, it is important to have standardized test methods that all certifying laboratories adhere to. The United States Composting Councils’ Test Methods for the Examination of Composting and Composts (TMECC) are the standard methods used for compost testing in both the United States and Canada and are jointly published by the USDA and the USCC.  They were selected to help both compost producer and purchaser to determine if the compost they are considering is suitable for the use that they are planning, and to help them compare various compost products using a testing program that can be performed by a group of independent, certified labs across the country and in Canada. TMECC provides protocols to sample, monitor, and analyze materials at all stages of the composting process.   

It is also important to know that although the TMECC methods are primarily what we follow for compost testing, we can also perform some analyses by ASTM methods as well.  ASTM methods are often requested by engineering firms, landscape architects etc.

What Is The Process?
Compost manufacturers in the STA program will send our laboratory samples of their compost products based on the volume they produce annually.  The laboratory then analyzes the compost for a defined set of tests and produces an analytical report as well as a Compost Technical Data Sheet.  The Compost Technical Data Sheet includes directions for product use, a list of product ingredients and analytical test results.  It is really advantageous for a compost producer to be able to hand a prospective customer a Technical Data Sheet produced by an independent lab.  It really lends validity to the product.  Another benefit of the STA program is that the compost producer has the rights to use the STA logo in their marketing or promotional activities.  Some may choose to print the logo on a label, marketing materials or display it on their web site.

The STA program has a list of “approved laboratories” on its web site http://compostingcouncil.org/labs/

Did You Know? (For Compost Customers)


  • Whether or not you are an STA participant, if you are sending in compost samples to the lab, make sure you send enough sample to us.  With our C10 compost test packages we normally ask for 2-3 sealable gallon Ziploc bags of material.  Not having enough sample can also affect turnaround times.  Germinations take quite a bit of material and if we don’t have enough, we have to complete all the other analyses first before starting the germination test.


  • If you are analyzing for fecal coliform, the EPA holding time is 24 hours, so please ship the sample on blue ice packs to us in a cooler using overnight shipping for compliance. Samples should be shipped overnight Monday - Thursday to avoid weekend delays.


  • A&L Great Lakes Laboratories has a cooler exchange program.  We will automatically ship you back the cooler to you so that you are ready for your next sampling event.

  • We have a dedicated Customer Service Representative who ensures your compost sample is processed correctly.  For any sample processing, handling or turnaround time questions, feel free to contact Mandee Muñoz (260) 483-4759 mmunoz@algreatlakes.com

  •  For further questions about the STA program, pricing, test packages or requirements, account creation or compost testing in general, contact Greg Neyman (260) 483-4759 gregn@algreatlakes.com

July 16, 2019

Looking Back on Crop Removal

We have all seen the news headlines and experienced the challenges of the 2019 planting season first hand. Successful crop advisors will evaluate how the 2019 planting season impacted growers’ operations and look for ways to improve profitability while further mitigating risk. This maybe more profitable than simply hoping for better weather patterns and improved commodity prices.

Soil fertility recommendations have two key parts that are added together to arrive at a final nutrient application rate. Part one is crop removal. How much fertilizer do I need to apply to account for or replace the nutrients removed by harvesting a crop? The second part is how much fertilizer above crop removal do I need to apply to increase soil test levels from where they are to a target level over a given period of time. Most recommendation sets are built to move from the current soil test level to a target in 4 years, that time frame could also be extended to reduce application rates. Likewise, how much less than crop removal do I apply to reduce soil test levels to target levels over a given period of time.

Traditional soil fertility recommendations take the approach of predicting or forecasting crop yields for the coming year or two. That may be as accurate as forecasting the weather. When it comes to determining the amount of fertilizer needed to replace the nutrients removed by harvesting a crop, the 2019 planting season may show us that there maybe a more cost-effective way to approach this value that requires a shift in perspective.

Rather than forecasting yield using a 10-year average or a yield goal for future yield, and applying fertilizer in advance, shift your mindset to replace the nutrients that past crops have removed. For example, you may have forecasted a 200 bu/ac corn crop for 2019 sometime before planting the 2019 crop, spread fertilizer, and now due to late planting that yield may only reach 170-180 bu/ac. So effectively this leads to a 9-15% over application of fertilizer in 2019 by incorrect forecasting. The use of yield monitor data, storage structure estimates, and scale tickets of past yield values are significantly more accurate than forecasting future yields. Due to low yields in 2019, producers maybe looking for an agronomically wise place to cut fertilizer costs by 10-15% in 2020, here might be an option.

When forecasting yields these overages are often not accounted for in the subsequent years. In years when yield is higher than expected we can actually short for the following crops. While routine soil sampling can catch these variances, there maybe an economic or agronomic impact until the next sampling cycle, or longer.

The main questions. So, what’s in it for the producer? And what’s in for the fertilizer retailer?  The producer’s key to future stability will be through better management. This process allows a producer to follow a low yielding year with an input reduction and hopefully be able to effectively maintain strong soil fertility after an exceptional yield year. The ag retailer that takes the effort to work through this transition building a stronger partnership with the producer in these tighter times will differentiate themselves in the marketplace. Better management is often the key to better profitability for both parties. Contact your ALGL agronomy representative with any questions you may have on this topic.

June 20, 2019

Collecting Plant Tissue Samples

We put a great deal of effort and resources into ensuring quality with our analyses here at A&L Great Lakes Labs. We want the data that you receive from us to be of the highest quality so that it is of the most benefit to you and your operation. However, quality analysis is only one piece of the puzzle. Good quality data begins with a good quality sample, and how the sample is collected and handled after collection goes a long way to ensuring its usefulness.

Plant tissue testing can be a very valuable tool to use in your fertility program. However, there are a number of guidelines that should be followed to ensure that this information is useful to you.

  1. Sample the correct part of the plant. The interpretations of plant tissue analysis have been developed based on a particular part of the plant, and that part can vary based on the crop and growth stage of the crop. For more information, please refer to our Plant Analysis Sampling Guide, available from our website.


  1. Collect enough sample for analysis. The amount of sample to collect can also be found in the Plant Analysis Sampling GuideThe amount of material listed is generally a guideline to help ensure that the sample is representative, but is not a minimum requirement.


  1. If the samples are extremely dirty, shake off any excess dirt or gently wipe the samples off. Washing of samples is generally discouraged, as this can affect the potassium (K) content of the material. If you do choose to wash the samples, do so soon after sampling and before shipping to the lab to reduce these losses as much as possible.


  1. Place the samples into PAPER bags, never plastic! Paper bags allow the samples to breathe and preserve the integrity of the sample.


  1. Include a completed Corn and Soybean Plant Submittal Form or Plant Tissue Submittal Form (for all other crops) with your samples. Complete the form as thoroughly as possible to ensure that your report is accurate. Be sure to indicate the plant type and growth stage on the submittal form.


  1. Pack the samples loosely into a box, and ship them to the lab as soon as possible. It is generally best to ship the samples so that they arrive at the lab within 2 days (samples shipped via UPS Ground generally arrive within two days when shipped from anywhere in the Great Lakes region). It is best to ship samples Monday-Wednesday, to reduce the possibility of samples being in transit over the weekend.

If you have any questions about plant tissue analysis, please contact your A&L Great Lakes regional agronomist or call the lab at 260-483-4759 and we will be happy to assist you!

June 20, 2019

Making Sense of Soil Nitrate and Ammonium Values

We have been fielding a wide variety of questions around soil nitrate and ammonium soil test levels. Many soil nitrogen levels from fall manure applications are indicating the need for supplemental nitrogen. Wet weather, and brief periods of warm weather, have led to nitrogen loss. When manure was applied later in the spring, the results are looking much more positive, often above the 25 ppm nitrate level that is universally considered adequate to produce a corn crop. There are some soil tests near or just below the 25 ppm nitrate threshold and may need to be reevaluated later in the season for a possible late season nitrogen application. This re-evaluation later in the season should allow time to evaluate nitrogen loss due to weather the remainder of the season and provides the opportunity to determine a realistic yield expectation. More information on interpretation of Presidedress Soil Nitrate Testing (PSNT) for Corn can be found on our website.

The traditional PSNT interpretations can be challenging to relate to. Providing that the samples were collected to a depth of 12” there is a simple “rule of thumb” to help make sense of a soil nitrate and ammonium value. Add the ppm of the nitrate and ammonium together and multiply by four. This is a relative nitrogen application rate available in the soil at the time of sampling. For example, sample 1 below would be 20 ppm nitrate + 10 ppm ammonium = 30 ppm x 4 = 120 pounds nitrogen. More on this concept can be found at https://www.agry.purdue.edu/ext/corn/news/timeless/AssessAvailableN.html.

While the traditional PSNT interpretations assume a continuous release of nitrogen to the soil from the mineralization of manure organic materials during the growing season, this calculation helps relate to a nitrogen level in the soil today. The difference between the estimated pounds of nitrogen, and a total nitrogen program for the season, is about the same as the PSNT interpretations would recommend.

May 31, 2019

2019 - Where Do We Go from Here?

It would be an understatement to say that the 2019 planting season has had its challenges, and has likely set the stage for a challenging growing season. Prolonged wet weather can be a factor in a number of critical stresses for the crop, including enhanced disease pressures, the prolonged impact of the standing water, and the potential for rooting impacts from possibly planting in less than ideal soil conditions. This newsletter contains a few articles that address questions that we have been receiving and those that we expect may arise in the new few weeks.

With so many factors that can cause crop stress, there will be an increased need to scout fields and diagnose problems during the 2019 growing season. Be sure to take a soil probe, shovel, soil sample bags, and plant sample bags with you to scout fields. A soil or tissue sample that comes back with an abnormal value is usually seen as valuable information in determining a cause, but it may be incomplete,  as tissue or soil samples that comes back normal can also provide valuable information.

It is recommended that soil and plant tissue samples are collected together, as the relationship between these types of analyses can provide great insight.

  • If both come back normal, then the issue is likely not fertility related. Instead, the focus should be on cultural and environmental factors. Be sure to dig the plant and evaluate the roots and seedbed for additional clues that may be pertinent to the diagnosis.
  • If the tissue samples indicate a deficiency while the soil sample indicates sufficient levels of nutrients, then the soil likely has the capacity to provide the needed nutrients, but the plant is not accessing them. In this case your focus should be to identify why the plant was not able to access the nutrients. Digging plants to access root distribution, density, and architecture can help to identify restrictions due to compaction or restricted rooting due to soil saturation. Restricted roots can play a big role in limiting a plants ability to access nutrients.
  • If the tissue sample comes back near normal to low, and the soil test is low, then a nutrient deficiency should be suspected. Often, less than ideal soil conditions can exacerbate underlying issues that have not presented themselves in the past. Keep in mind some of these nutrient issues may be addressed with an in-season application. However, others may be a project to begin working on for subsequent cropping years.

If you can, be sure to brush up on crop physiology! That knowledge can be very helpful when diagnosing environmental and cultural crop challenges. For example, for the first few weeks the roots of a plant are prominently providing water to the growing seedlings and the nutrients are coming from the seed, so the information provided by a plant tissue analysis must be taken in context with many other factors. For more information check out our newsletter article “Get the Most from Early Plant Tissue Analysis”. Please call your ALGL agronomist if you have any sampling questions.

May 31, 2019

Get the Most from Early Plant Tissue Analysis

Early season field scouting is essential to ensure good emergence, detect potential weed and insect pressure, and monitor the effectiveness of your fertility program. The earlier an issue is detected, the better chance there is to correct the issue. One tool to help detect potential fertility problems is plant tissue analysis. However, to get useful results back from the lab, the proper plant part must be collected for the current growth stage of the crop.

The proper method for collecting early season corn tissue samples is to collect 15 or more whole plants to comprise a single sample. This is only referring to the above ground portion of the plant. This method is appropriate for corn up to 12 inches tall, or approximately V4 to V5. However, corn can be sampled too early to provide useful data for making decisions. During the first three weeks after emergence, much of the nutrient content of the young plant is not coming from the soil, but from the embryotic tissues within the seed. The young plants also have a very small seminal root system during the first few weeks which are not able to access the nutrients in a large volume of soil; the main role of this root system is to get water to the seed and new leaf tissues. Nutrient deficiencies during the first few weeks are likely caused by environmental conditions and do not necessary reflect low nutrient levels in the soil. An example of this situation is young corn plants turning purple. Purpling of young corn plants can be a symptom of a phosphorus deficiency, but can also occur on soils with adequate phosphorus levels when nighttime temperatures are low. Cool spring nights slow metabolic processes in the plant resulting in the buildup of anthocyanins, which appear purple. Tissue sampling of corn should be delayed until 3 to 4 weeks after emergence, or until the plants have developed a functional nodal root system in order to ensure that the tissue analysis is representative of the nutrients that are available to the plant.

V4 corn plant showing purpling

Image 1: V4 corn plant showing purpling. Source: purdue.edu

Similar to corn, soybeans can also be sampled too early. Proper tissue sampling for all growth stages for soybeans is collecting 25 or more of the most recently mature trifoliates without petioles. The first leaves to appear on a recently emerged soybean plant are unifoliates, or cotyledons. The nutrient content of the cotyledons, sometimes referred to as seed leaves, does not accurately represent the nutrients available in the soil. Tissue sampling in soybeans should be delayed until the V2 growth stage. The V2 growth stage is reached when the second trifoliate has completely unrolled. It will generally take a minimum of 3 to 4 weeks after emergence to reach this stage. At this point, the first trifoliate is considered mature, and can be collected for tissue analysis.

V2 soybean plant


 Image 2: V2 soybean plant. Source: clemson.edu

Spring tissue sampling of winter wheat can be a very useful management tool. The timing of wheat sampling does not correspond to a specific growth stage though. The important factor when determining the appropriate time to sample wheat is that the wheat has broken dormancy and is actively growing again. Generally, wheat will be at a growth stage of Feekes 3 or 4 when this occurs. The appropriate method for collecting wheat samples at this stage is to collect 25 or more whole plants from ½ inch above the soil surface. One of the benefits of early season wheat sampling is to fine tuning a “green-up” nitrogen applications based on the nitrogen content of the plant at Feekes 5 (please visit the Purdue Extension News Release for more information). 

Feekes 5 wheat

Image 3: Feekes 5 wheat. Source: Kansas State University

Accurate plant tissue testing begins with proper sample collection and handling. Make sure to collect the proper plant part for the current growth stage of the crop, and collect the proper number to make the sample. This information can be found on the plant analysis page at algreatlakes.com. Always avoid soil contamination in your plant samples. Package samples in paper bags. If shipping is delayed, store samples in a cool location, but do not freeze. Never include roots with a plant sample. If you have any questions on proper plant tissue sampling, please contact the lab for assistance.



May 31, 2019

Emergency Forage Options

Many livestock and hay producers are dealing with forage stands, particularly alfalfa, that have been extensively damaged by this past winter and exceptionally wet conditions over the last 2 growing seasons. The following article from OSU provides timely information for producers to consider when determining their options for the upcoming growing season.



April 25, 2019

Effective Herbicide Use Starts at the Tap

Herbicide resistant weeds are an ever-growing concern in production agriculture. One of the quickest ways to encourage weeds to develop resistance to a herbicide chemistry is to use less than the labeled rates of that herbicide. Knowing this, very few applicators will use less than labeled herbicide rates. However, what if an applicator is effectively applying less than labeled rates unknowingly due to the quality of their spray water?


This University of Florida extension article discusses how spray water chemistry impacts the performance of flumioxazin, a key ingredient in the effective control of herbicide resistant marestail. We offer two spray water analysis packages to help you identify the challenges with your spray water so you to make the most effective applications possible.


April 25, 2019

Soil Testing in a Tough Ag Economy

Anyone who has worked in the agricultural industry in the last few years has heard someone say, “the days of $7 corn and $17 beans are gone.” You may have even seen “In memory of…” decals on truck windows commemorating those commodity prices. The truth is prices are down and most agricultural economists predict that lower prices are going to be the norm for several more years. In these tight times, producers must critically evaluate every crop input from seed selection to herbicide program to fertility program. However, these decisions cannot be made with a short-sighted mentality of getting though the current season and hoping for better prices next year. These decisions have to be made with consideration of how it will impact their operation for the next three, five, or even ten years, especially if commodity prices remain low.

When selecting which seed to plant, it can be tempting to simply go with the highest yielding variety from the previous year’s variety trials. Yield is obviously important, but be sure to purchase a variety appropriate for your operation. For example, do not pay extra for traits to protect against diseases or pests that are not an issue in your region. On the other hand, when selecting an herbicide program, glyphosate alone has a very attractive price tag, but it is necessary to utilize herbicides with other modes of action occasionally to prevent glyphosate resistant weeds from taking over. It may cost a few more dollars per acre at the time, but will certainly be worth it in future years when glyphosate is still an affordable option for most of your weed control.


Soil fertility inputs can represent one of the highest costs in row crop production. In addition to the cost of the fertilizers, there are additional costs for soil sample collection, laboratory analysis, soil mapping and prescription software, and variable rate application. To help reduce costs, some producers may choose to reduce the intensity of soil sampling by using larger grids, fewer management zones, or only collecting a single composite sample from each field. Others may choose to reduce the frequency of sampling or completely abandon sampling all together. While these decisions will initially reduce input costs, how will they impact the productivity and profitability of the operation in the future?

The goal of any fertility program should be produce the greatest yield with the least amount of fertilizer. The most effective way to reduce fertilizer inputs is to identify the areas that require additional inputs and those that do not need any. Soil fertility levels and soil pH can vary greatly in a single field whether it is from natural soil variation or past fertility practices. Collecting a single sample from a field and making a flat rate application of fertilizer or lime based on that single sample is likely to result in an over application in some areas and under application in others. The smaller the area that a soil sample represents, the more confident you can be that the laboratory results accurately represent the area. Maintaining an intensive sampling program, whether grid or zone, is essential to assure the greatest return on your fertilizer investment. 

Too often soil test results are used to make a fertilizer prescription and then discarded. There is a lot to be learned from reviewing previous soil test results. By evaluating the impact of a fertilizer or lime application on the soil test levels, future application rates and timing can be adjusted to better suit your soil type. For example, lime applications are intended to last for three to four years, but on some soils a lime application may only last one to two years and others soils it may last six or seven years. Soils that do not respond to fertilizer or lime applications as expected can only be identified with routine sampling frequency. It takes at least three sampling cycles to begin to identify trends such as this. If a field is sampled on a 4-year cycle, it will take eight years before any adjustments to the soil fertility program can be made with any confidence. By sampling more frequently, every two or three years, these trends can be more quickly identified and addressed.

Managing a successful farming operation means minimizing risk whenever possible. Maintaining a routine intensive soil sampling program is the best option for minimizing the possibility of excessive fertilizer application or losing yield from under application.

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