Calcium Products - Test Plots
Calcium Product 98G

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Influence of Gypsum on Crop Yields at South Dakota State University

Gypsum, calcium sulfate (CaSO4 . 2H20), is naturally occurring mineral mined for many purposes. Gypsum has calcium content of 23% and sulfur content of 19%. In agriculture it is used for treating sodium affected soils. The calcium in the applied gypsum will displace sodium on the soil cation exchanged capacity. This is a mass action process; therefore large amounts of calcium are required.
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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…
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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…
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SuperCal SO4 with Field Corn

Project Code: 99-61240Location: Hollandale, MNSponsor: 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   Treatments Rate Yield bu/A SuperCal SO4 and Urea 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 0 141.3 c Yield means followed by the same letter do not significantly differ (P=.05 Duncan's)
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