PROVEN PERFORMANCE, AGAIN AND AGAIN.
2025 Indiana Corn Experiment – Site 1
Key Results: SUL4R-PLUS increased corn yields by 16 bu/acre (9.4%) when applied at 100 lbs/acre and by 7 bu/acre (4.1%) when applied at 200 lbs/acre.
Trial Details: Each treatment was replicated twice. The lowercase letters above each bar indicates statistically significant differences. Bars with different letters are significantly different from each other, while bars with the same letter are not different from each other. Significant differences were detected using Fischer’s LSD at p < 0.10.
Indiana – 2025
2025 Indiana Corn Experiment – Site 2
Key Results: SUL4R-PLUS increased corn yields by 14 bu/acre (4.5%) when applied at 100 lbs/acre and by 13 bu/acre (4.1%) when applied at 200 lbs/acre.
Trial Details: Each treatment was replicated twice. The lowercase letters above each bar indicates statistically significant differences. Bars with different letters are significantly different from each other, while bars with the same letter are not different from each other. Significant differences were detected using Fischer’s LSD at p < 0.10.
Indiana – 2025
2023 Application Rate Corn Trials
KEY RESULTS: Applying SUL4R-PLUS increases grain yield at a variety of application rates. The highest observed yield increase in the trial was 23 bu/ac more than the untreated check.
TRIAL DETAILS: In these trials, SUL4R-PLUS was applied at rates of 100, 150, 200 and 250 lbs/acre and compared to an untreated check.
Indiana – 2023
2023 Application Rate Soybean Trial
KEY RESULTS: Applying SUL4R-PLUS increases grain yield at a variety of application rates. Yield increases up to 11.4 bu/ac were observed in this trial.
TRIAL DETAILS: In this trial, SUL4R-PLUS was applied at six different rates ranging from 100 lbs/ac to 350 lbs/ac.
Grain Yield
2022 Application Rate Corn Trials
KEY RESULTS: Applying SUL4R-PLUS increases grain yield at a variety of application rates. The highest observed yield increase in the trial was 23 bu/ac more than the untreated check.
TRIAL DETAILS: In these trials, SUL4R-PLUS was applied at rates of 100, 150, 200 and 250 lbs/acre and compared to an untreated check.
Indiana – 2022
2022 Nitrogen Reduction Corn Trials
KEY RESULTS: SUL4R-PLUS works in tandem with nitrogen reduction treatments while also increasing yields.
TRIAL DETAILS: Each treatment had 100 lbs/acre of SUL4R-PLUS applied in addition to a nitrogen reduction treatment relative to the amount of nitrogen applied in the check that had no SUL4R-PLUS applied.
Kentucky 2022
2021 SUL4R-PLUS vs. AMS Corn Trial
KEY RESULTS: Even with 7 lbs S/acre more and additional N from AMS, SUL4R-PLUS yielded 10.1 bushels more per acre.
TRIAL DETAILS: In this trial, AMS and SUL4R-PLUS were both applied at 100 lbs/ac in seven comparisons at a site in Shelbyville, IN.
2021 SUL4R-PLUS vs. AMS Corn Trial
2021 SUL4R-PLUS vs. AMS Soybean Trial
KEY RESULTS: Even with 7 lbs S/acre more and additional N from AMS, SUL4R-PLUS yielded 2.7 bushels more per acre.
TRIAL DETAILS: In this trial, AMS and SUL4R-PLUS were applied to soybeans at 100 lbs/ac at a site in Shelbyville, IN.
2021 SUL4R-PLUS vs. AMS Soybean Trial
2021 Indiana Wheat Trial
Key Results: Winter wheat yield increased 13.4 bushels/acre (10.9%) with SUL4R-PLUS B+Z compared to AMS.
Trial Details: SUL4R-PLUS B+Z and AMS were applied at equivalent nutrient rates and supplied 16 lbs S/acre.
Greensburg, Indiana – 2021
4.25 BU/A YIELD ADVANTAGE
97% of our soil samples (were) coming back as low to deficient in sulfur…Since using SUL4R-PLUS fertilizer, our trials have shown a better stand and healthier soybean plant early on. In three of three comparisons, it has translated to an average of 4.25 bushels/acre yield advantage where we applied SUL4R-PLUS’ patented fertilizer.
— RALPH E. HART, CROP PRODUCTION SERVICES
CALCIUM CLARIFIED
Although calcium is a secondary plant nutrient, it supports vital plant functions contributing to top-end yield potential. Today’s high-yielding crops require more calcium than those planted even five years ago. Generally, less than 5% of measured calcium in a soil sample is plant-available. SUL4R-PLUS helps bridge the gap by providing 100% plant-available calcium.
- Critical for plant cell wall structure and integrity for stronger plant structure.
- Essential for early root growth and leaf development.
- Critical for nodule formation in legume crops.
- Regulates nutrient uptake and movement throughout the plant.
- Activates enzymes and transmits signals that coordinate cellular activities.
- Stimulates soil microbial activity.
- Improves soil structure and flocculation.
- Protects plants against stress and disease.
Granular Analysis
| Calcium | 21% |
| Sulfur | 17% |
| pH | 7–8 |
| Granular Range (SGN) | 250–280 |
| Crush Strength | 8 lbs. |
| Uniformity Index (UI) | >50 |
| Bulk Density | 58–60 lbs./Cubic ft. |
Rate of Application
| SUL4R-PLUS | Calcium | Sulfur |
| Bu/Acre | Bu/Acre | Bu/Acre |
| 100 | 21.0 | 17.0 |
| 200 | 42.0 | 34.0 |
Optimum use rate varies according to crop need. As the chart above indicates, 100 lbs. of SUL4R-PLUS fertilizer per acre delivers 21 lbs. of calcium, and 17 lbs. of sulfur per acre.
SULFUR SIMPLIFIED
Sulfur used to be abundant in most soils, but over the past two decades, soil sulfur levels have declined, limiting crop yield potential. Most crops take up sulfur throughout the growing season, requiring a stable nutrient supply from planting through maturity. With its controlled-release formulation, SUL4R-PLUS ensures crops have the sulfur supply they need when they need it.
- Helps build amino acids and proteins to support vital plant physiological functions.
- Improves nitrogen uptake and utilization.
- Supports chlorophyll formation for efficient photosynthesis and maximum yield potential.
- Aids in seed production.
- Helps develop and activate vital plant enzymes and vitamins.
- Improves winter hardiness in overwintering crops.
- Supports optimal timing of glutathione (plant antioxidant) production, improving early-season stress tolerance.
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