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Calcium Product 98G


SuperCal SO4M on Field Corn Yield


• Planted field Corn (Novartis 2555 Bt) on May 8, 1998 at 33,000 SPA
• 10 acre field
• 5 Replications
• 2 Treatments



Statistical Treatment Comparisons


Project Code: 98-61015

Location: Hollandale, MN

Sponsor: Calcium Products, Inc.

By: Agri-Growth, Inc.



Yield bu/A

SuperCal SO4M

300 lbs/A

156.7 a

Untreated Control


144.3 b


Means followed by the same letter do not significantly differ (P=.05 Duncan's MRT)
Field corn (Novartis 2555 Bt) planted on May 8, 1998 at 33,000 SPA
SuperCal SO4M applied prior to planting
5 replications


SuperCal SO4 with Field Corn

Project Code: 99-61240
Location: Hollandale, MN
Sponsor: Calcium Products, Inc.
By: Agri-Growth, Inc.



• Field corn (Novartis NK3030) planted May 29, 1999 at 35,000 SPA
• Treatments applied prior to planting
• Treatments:
       o SuperCal SO4 at 50 lbs/A (banded 6" deep) and Urea at 30 lbs/A actual N
       o SuperCal SO4 at 50 lbs/A (banded 6" deep) (only)
       o Urea at 30 lbs/A & actual N (only)
       o Untreated control
• Five replications




Yield bu/A

SuperCal SO4 and

50 lbs/A
30 lbs/A actual N

151.2 a

Urea (only)

30 lbs/A actual N

148.7 b

SuperCal SO4 (only)

50 lbs/A

145.5 bc

Untreated Control


141.3 c

Yield means followed by the same letter do not significantly differ (P=.05 Duncan's)


SO4 on Corn and Soybean

A two treatment trial where two treatments are paired together in adjoining strips is a type of a randomized complete block design. This trial had ten paired strips, each containing one strip each of the two treatments.





Corn Harvest Analysis

This type of trial can be analyzed using a t-test, which determines if numerical difference between treatments are legitimate. Following is a "cookbook" approach to analyzing the data from a trial with up to ten double strips, each containing one strip each of the two treatments. The second and third columns are labeled "yield," but any type of data can be analyzed this way.


The difference between the two treatments is given in Cell 3. The number in Cell 8 is called the "t value" (be sure to record it without the negative sign, if Cell 3 us a negative number, that is, if treatment B has a higher yield than treatment A). We assess whether the difference between treatments (Cell 3) is real or whether it's due to random chance using the following test:

We're 90% sure the treatments really differ if Cell 8 is larger than: 1.860

We're 95% sure the treatments really differ if Cell 8 is larger than: 2.306

Therefore, the statistical confidence that there is a difference between these treatments is greater than 95%. So, the plots treated with  SO4 produced a significantly higher corn yield than those that were not treated.


Soybean Yield Analysis


For the soybean analysis, the statistical confidence appears to be less and the resulting conclusion is that the difference is not explained by the statistical model, meaning that there is not a real difference between the two yield values, despite the roughly 3 bu/A increase when using gypsum.



SuperCal SO4 on Alfalfa Yield

SuperCal SO4 on Alfalfa Yield

Location:          Hollandale, MN - 20 Acre Field

Date:               1999

Crop:               Alfalfa - 99-64220

                       Planted @ 16 lbs/acre

Treatments:      SuperCal SO4 applied at 300 lbs/acre

                       Applied March 16, 1999

                       Six replications



SO4 vs. Cal-Sul on Soybean

The 'SO4 versus Cal-Sul broadcast on soybeans' study evaluates these products' ability to enhance soybean seedling vigor, stand establishment and yield response. An 80-acre field was planted with soybean variety Pioneer 92BO5 (141,000 seeds per acre) and  SO4 at 300 lbs/A and 500 lbs/A versus Cal-Sul at 300 lbs/A and 500 lbs/A applied broadcast in 44 foot wide strips, 1,200 feet long. Strips were alternated in six replicates and comparisons were tracked throughout the growing season until harvest.



An update on the Iowa State University recreational soccer project

In the fall of 2012, I was still working part time with Iowa State and the newly seeded athletic fields built the previous year were in need of attention for weak, spotty growth. Dr. Dave Minner, myself, and Brent Cunningham (of rec services at ISU) all went over what took place during field construction (an outside contractor built the fields) to try and determine why the newly seeded grass wasn’t growing like it should. The one thing that stuck out to us was the use of compost from the ISU dairy farms that hadn’t been tested prior to application. Using compost is a great way to build soil structure and organic matter, however, if it isn’t completely composted, it can contain high levels of soluble salts harmful to turfgrass growth.

We took a handful of soil samples and sure enough, there were high levels of K, Mg and Na, some of which can hinder plant growth if in high enough amounts. Further, if Mg is found in high enough amounts (> 12%), it can have negative, dispersive impacts on soil due to molecular differences when compared with Ca. We think of Ca as the main building block and Mg as a secondary structural component, required in much lesser amounts.

I was also working part time with Calcium Products during this time knew this field would be a perfect fit for a SuperCal SO4 pelletized gypsum application to reduce the levels of K, Na and Mg in the soil, restore proper cation balance and allow the harmful salts to be leached out. Calcium Products donated gypsum to the school to be applied at a rate of 10 lbs/1000 sq ft. to the two fields.

Recently I was able to visit ISU to see how the fields were progressing after the SO4 was applied this spring. Brent has been very happy with how the fields have progressed after the SO4 application and a modification to his fertility program, which included mostly nitrogen applications since other nutrients were in sufficient amounts, according to our soil tests. I almost couldn’t believe they were the same fields I was on last fall!

Thanks to Brent for cooperating with us on this project. We will take soil samples again this fall and see how the soil chemistry is progressing and likely continue with maintenance applications of SuperCal SO4 in the coming years. Take a look at some photos ‘before’ and ‘after’ the SuperCal SO4 application and modification of fertility.

poor grass growth at ISU Fig. 1. A picture taken 6/13/12 showing more spotty growth and areas with no grass growing.

lush turf at ISU from SuperCal SO4
Fig. 2. A picture taken one year after the previous picture, 6/26/13, showing healthy, lush turfgrass, almost ready for play.
beautiful turf from SuperCalSo4
Fig. 3. A picture taken 7/11/13 showing how healthy the grass looks, thanks to the SuperCal SO4 application and modified fertility program.
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