Calcium Products - Andrew Hoiberg, Ph.D.

Calcium Products - Andrew Hoiberg, Ph.D.

Andrew Hoiberg, Ph.D.

Andrew Hoiberg, Ph.D.

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 Zn and N on Corn

SuperCal SO4 has been shown to increase nitrogen uptake as sulfur in SuperCal SO4 aids in the nitrification process. Calcium helps to stabilize nitrogen by decreasing volatilization loss. Calcium is essential to the biochemical process of plants to absorb nutrients. Adding SuperCal SO4 to your fertility program will make your expensive nitrogen and zinc work better.


SuperCal SO4 on Soybeans with White Mold

Plot Map


• Planted soybeans (Stine 2500) on May 16, 1998 at 50 lbs/A
• 20 acre field
• 5 Replications
• 2 Treatments

CaSO4 Soybean with White Mold Yield Map 1998



The average of the areas receiving SuperCal SO4 yielded 48.4 bushels, the areas that did not get treated averaged 38.6 bushels, which was a difference of 9.8 bu/A. At $10 soybeans that is a return of over $65 per acre.


SuperCal SO4 and Nitrogen Utilization on Corn

SuperCal SO4 was applied to a high pH 7.5 field with corn at Cedar Falls, Iowa in 2002. Four replications of six treatments were arranged in a randomized complete block design. This was an excellent year for corn and good yields were noted throughout the area. A moisture stress period was noted in midsummer, but timely rains contributed to good yields.

Yields increased from 207.6 bu/A for control to 221.8 bu/A with 300 lbs/A SuperCal SO4 applied at planting. A base rate of 140 lbs/A nitrogen (N) was applied as anhydrous ammonia to soybean ground, considering a rough credit 50 lbs. N/A for the contribution of soybeans in the rotation. However, the addition of 80 lbs N/A at sidedress time resulted in only a 2.1 bu/A yield increase over the 140 lbs N/A areas. One could speculate that the maximum nitrogen response rate had been reached with 140 + 50 + 80 = 270 lbs/A N with soybean credits. Yields did not increase with 300 lbs/A SuperCal SO4 plus 80 lbs N/A at sidedress time, and it is speculated the plants may have grown too much prior to the moisture stress period. Early application of SuperCal SO4 at planting may have contributed to promoting plant growth at the right time, and resulted in increased partitioning of photosynthates into the kernel.


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