Agronomy Talk

Agronomy Update

How Much Yield Am I Leaving On The Ground?

Published on Monday, October 13, 2014

How Much Yield Am I Leaving on the Ground?
It is easy to do a quick estimate behind the combine of how much yield is left in the field. Carefully remove residue in a square foot area and count how many seeds are lying on the ground.



2 corn kernels per square foot = 1 bushel per acre
3 soybeans per square foot = 1 bushel per acre.

More importantly is to determine if the loss is pre-harvest, header loss, coming out the back of the combine, or a leak on the machine.

The amount of loss that is considered acceptable is up to you and your experience with your machine, but in normal conditions it is possible to keep loss under a bushel per acre.

Ag Lime Rate
How much lime to put on a field does not have to be complicated or as simple as put 3000# on whether it needs it or not. Here is a simple way to decide which fields need lime, how much, and what kind.

Field pH as shown on a soil test: Shoot to have your pH between 6.5 – 6.8. A pH of 5.5 is 10 times more acidic than a pH of 6.5. So it gets to be serious business when your pH is below 6.

Buffer pH: Clays will have a lower buffer value and sands a higher buffer value. Clays will need a larger amount of lime to change pH and need adjusted less frequently. Sands will need pH adjusted more frequently than clays but require less lime to budge pH.

Calcitic vs. Dolomitic: 50 PPM or more is an adequate level of Magnesium on your soil test. Dolomitic limestone consists of Magnesium and Calcium whereas Calcitic (Hi-Cal) lime has a very low Magnesium percentage. Talk with your Beck’s Sales Agronomist, crop consultant , or extension agent about what lime source may be best for you. View different analysis of lime available in Ohio at 

ENP: Effective Neutralizing P ower is a value associated with a given lime source that takes into account fineness of grind, percent moisture, and total neutralizing power. This makes it a comprehensive value useful for calculating pounds of lime needed for a desired pH level.

How Much? Use the below chart to determine how much lime is necessary based on you current pH and buffer pH. Next, adjust for your lime source’s ENP. For example: My soil pH is 6.2, buffer pH is 6.8 and I am using Piqua Lime with and ENP of 1812 lb/ton. The chart value is 0.9 tons; 1812/2000lb tells me my lime source is 90.6% effective so 0.906 : 0.9 = 1 ton per acre.




Any application of over four tons should be split applied. No-till fields can cut the recommendation in half if not plowed. Do not surface apply urea where lime was surface applied recently.



**** All considerations are for corn, beans, and wheat rotations grown in mineral soils (less than 20 percent organic matter). Organic soils are allowed a pH around 5.3. Aflalfa requires slightly higher pH.

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Alex Johnson

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