Replenish Super KS: Potassium, Sulphur and a Functioning Soil
A healthy soil is not defined by one nutrient reading. It is a system in which minerals, organic matter, roots and soil organisms interact to sustain crop growth. Potassium and sulphur are part of that system, but so are the processes that make nutrients available when the crop needs them.
Replenish Super KS combines mineral sources of potassium and sulphur with activated compost in a granular fertilizer. We consider it a potential component of a soil-health program where the goal is to correct fertility limitations while maintaining the biological processes responsible for nutrient cycling.
Why potassium and sulphur matter to soil function
Potassium helps plants regulate water movement, enzyme activity and the transport of sugars produced through photosynthesis. It is particularly relevant to crop performance under moisture stress, although adding more potassium will not improve a field that already has an adequate supply.
Sulphur is central to protein formation and other plant processes. Its cycling is closely tied to soil biology: elemental sulphur must be oxidized to sulphate before roots can absorb it. The rate of that conversion changes with temperature, moisture, oxygen and microbial activity.
That relationship is important in the Peace Country, where cold soils can restrict early-season nutrient transformations. The objective is not to apply more sulphur indiscriminately, but to understand how much the crop needs and when that supply becomes available.
Activated compost and the biological approach
Super KS is made with mineral-sourced potash, sulphur and proprietary activated compost. The compost component contributes organic material and microbial communities alongside the mineral nutrients. It is part of Replenish’s broader approach to feeding the soil rather than viewing fertilizer solely as a soluble nutrient delivery system.
This formulation is a reason to study its effect on soil biology, not proof that each application improves organic matter, diversity or yield. Soil health responds to the whole management system—rotations, roots, residues, disturbance, moisture and nutrient balance over time.
Balancing nutrients instead of chasing a fertilizer rate
Super KS carries a 0-0-30-35 guaranteed analysis (N–P₂O₅–K₂O–S). The product is specifically focused on potassium and sulphur; it provides no guaranteed nitrogen or phosphorus.
A potassium deficiency cannot be diagnosed by the product analysis alone. Exchangeable K, crop removal, rooting depth, soil texture and interactions with other cations all deserve attention. Likewise, the sulphur supplied by Super KS should be compared with the crop’s actual needs and with any more immediately available sulphate already in the program.
We would rather identify the limiting factor from a soil test than recommend a fixed rate for every farm. If a field needs potassium but has sufficient sulphur, the combined analysis may not be the most efficient fit.
Soil health takes time and evidence
We are interested in whether Super KS can help address nutritional limitations while fitting into a more biologically informed fertility strategy. That means comparing soil chemistry, crop growth and nutrient-use outcomes through time, rather than treating one year’s appearance as proof of regeneration.
On-farm trials should compare equivalent field conditions and account for the total nutrient program. A useful result must make agronomic sense and economic sense; soil health improvements are not measured by yield alone.
What Do We Know About the Biology in Super KS?
One part of the Replenish approach that interests me is the biological community carried with its activated compost. In its January 2026 product portfolio, Replenish reports that microbial DNA profiling detected 1,240 species in Super KS, with Mucoromycota and Proteobacteria among the prominent groups listed. That is a useful look at the diversity found in a sample of the material.
A species count is not the same as the number of living microbes delivered to a field, and it doesn’t measure how many become established around crop roots. But the biological analysis gives us something concrete to look at as we evaluate the product alongside soil tests and field performance.
At this stage, I haven’t seen a standalone, publicly available Super KS crop trial with the same detail as the Farming Smarter comparisons for HESO and Rebuilder. I would rather say that openly than borrow yield results from a different formula. Super KS should be judged first on whether a field actually needs its potassium and sulphur, and then on any additional biological response we can measure.
Replenish 2026 product portfolio and microbial analysis summary (page 4). We will add the full laboratory report if Replenish makes it available.
Product information
Replenish Super KS product sheet (PDF) · Compare the Replenish range · Our soil-health consulting approach.
To discuss where Super KS might fit in your program, contact Peace Soil Works with your soil-test results and fertility goals.