Stalk Lodging in Potassium Deficient Corn

In July we had over 60 mph winds at our Walcott Iowa research farm and I noticed some stalk lodging.

As you may know, corn with lower than optimal potassium levels, yield less grain. On top of that, potassium deficiency also reduces stalk strength, causing both root and stalk lodging.


How to Spot Potassium Deficiency in Soybeans

Potassium deficiency in soybean plants can be confusing. Typically in corn we see signs of deficiency worst at the bottom of the plant. This is because the nutrient is very mobile and potassium will prioritize leaves at the top of the plant. However, in soybeans, we often see the deficiency towards the middle to top of the plant with yellowing edges and necrotic leaf margins, while lower leaves can remain healthy and green.

Quarterly Newsletter: October 2019

Top Banner of Corn


Agronomy Research Book

Hidden Genetic
Potential in Seeds

Potassium Deficiencies in Soybeans, 2019


Owner's Update

Liqui-Grow is committed to sourcing farmer crop input financing on your behalf. We know that you have many choices when making your 2020 input partner decision. We have diligently worked on our customer’s behalf to line up options for 12-15 mo. financing choices at VERY LOW APR’S.

Many of these are through John Deere Financial & Rabobank, but there are also other options available. Liqui-Grow is able to offer fertilizer financing as well as Crop Protection & Seed. Ask us for further details.

-Scott, Hov & Bruce Tinsman

photo of owners


Agronomy Research Book Coming Soon

Cover of Agronomy Research Book

Since the spring of 2015 I have been conducting research on new products and management practices farmers can potentially use to increase both corn and soybean yields and profitability. By now I have amassed a bunch of results that are finalized and ready to share.

I will share these results in the form of a book, which will contain research on fertilization products and practices, seed treatments for soybeans, fertilizer additives and much more. These research summary books will be available later this fall at any of our Liqui-Grow locations. You can also request a book by calling the main office (563-359-3624) or via email by emailing Tammie Suhl at tjs@liqui-grow.com.


Hidden Genetic Potential in Seeds

photo of Katie Hess
Katie Hess
Seed & Seed Treatment Manager










"A kernel of corn or a soybean still appears to be the same as it was 30-50 years ago. What potential seed has, is what has changed."

Technology can come in many forms. Most of the time it looks and feels new. Seed is not that way. A kernel of corn or a soybean still appears to be the same as it was 30-50 years ago. What potential seed has, is what has changed. More precise research and development has brought us more yield potential, 2019 is proof of that. As farms are being harvested, and in areas not lost completely to Mother Nature’s dealt hand, yields are meeting or exceeding expectations. So, as I continue to get the question, “Why does this seed cost so much?” I will continue to answer with, “Because of the genetic potential and technology suppliers are putting into it.”

Seed is the first decision to make when setting yield goals. It can’t be the only decision. There has to be a solid fertilizer, weed management, and plant health program put together to help seed reach its genetic capabilities. Our staff at Liqui-Grow is fully trained to help you reach yield goals and the return on your investment. Over the past year we have been training on hybrids and varieties more than ever to help you make the right decision on your own acre.

Unfortunately, we lost some planned plots to the spring weather events. The remaining plot results will be posted once again on our website: www.liqui-grow.com. It’s a great start to see the genetic potential these hybrids and varieties have.


Potassium Deficiencies in Soybeans - 2019

photo of Dr. Jake Vossenkemper
Dr. Jake Vossenkemper
Agronomy Research Lead    









"While higher than normal soybean yields are clearly a good thing, high soybean yields also remove large amounts of potassium from the soil."

In the summer of 2019, I observed more potassium deficiencies in soybeans than I have ever seen in my 12 years as an agronomist. Why? These deficiencies in 2019 could be explained by a number of factors, including poor root development from early saturated soils, the dry soil conditions that most of us experienced from mid-June to mid-August or that potassium soil test levels are well below the optimum in some fields.

Dropping soil test potassium levels could be a key culprit given many of us have had exceptional soybean yields over the past few years (2016, 2017 and 2018). While higher than normal soybean yields are clearly a good thing, high soybean yields also remove large amounts of potassium from the soil.

Many may be surprised that a 65 bu/ac soybean crop removes nearly 80 lbs of potassium per acre from the soil. Ramp that up to 80 bu/ac and removal increases to nearly 100 lbs of potassium per acre. While it’s hard to complain about above average soybean yields in the not so distant past, it’s also important to replenish your soils with fertilizer potassium so that high soybean yields can be maintained.

Potassium Removal Chart

Yellow tinted soybean leaves showing potassium deficiencies.

Potassium deficient soybeans near Morning Sun, IA in 2019. Potassium deficiencies in soybeans are indicated by yellowing and or necrotic leaf margins often in the upper half of the canopy.


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