All Posts from June 2017

Time to start watching for potassium deficiencies in soybeans

Soybeans require a whole lot of potassium (K) and remove a whopping 1.4 pounds of K2O per bushel. The application rate for a 60-bushel per acre soybean crop is 84 pounds of actual K2O or 140 pounds of potash (0-0-60) per acre. As we strive for 70- and 80-bushel beans that amount increases.

The first place to look for a potential potassium deficiency is a soil test....

Controlling problem weeds post-emerge in soybeans begins with pre-emerge planning.

The past few days have been filled with many service calls on both waterhemp and marestail control. These weeds are becoming major challenges in our crops and this season has proven to be one of the tougher one I have encountered in my career. The task of killing these weeds is already a challenge, but this season has been especially challenging. Here’re...

Editor’s note: This is the second in a series of three articles on the role of hormones in soybean plants.

Soybean reproduction is all about supporting and increasing cell division. Cell division drives flower fertility and survival, pod set, beans per pod and, ultimately, seed size and weight.

Soybean plants have a unique trigger which occurs at R1, but often goes unnoticed. The first flowers appearance triggers a...

Weird spring—wet and cool early, followed by hot and dry. What diseases will prevail?

In early planted soybeans many were worried about Pythium root rot, thanks to the cool, wet weather.  However, what root rot diseases can we expect in soybeans that were planted later?  I recently evaluated a soybean research plot planted May 10 near Jacksonville, Illinois, and found a patch of Rhizoctonia root rot. 

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PPO herbicides + cool, wet conditions = herbicide damage

With the recent spate of hot, dry weather it’s hard to remember that only a few short weeks ago we were inundated with rain—delaying planting and causing replants, stand loss and even crop damage. One symptom of the rainy spell was protoporphyrinogen oxidase (PPO) herbicide damage.

Growers usually apply residual herbicides before or...

Sporadic emergence of soybeans this spring could cause headaches for farmers all season long.

What exactly happened to emergence this season? To answer this question, it’s important to understand factors affecting seed germination.

Generally, the soil will dry out to the depth of tillage passes, usually the top 3 to 4 inches of soil. Without rainfall, by the time the planter reaches the field no moisture remains in the seedbed...

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