Most growers focus on NPK ratios, but salt index is the hidden driver of root zone stress, soil EC buildup, and long-term yield decline. Here's what the data shows.
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Every grower knows nitrogen, phosphorus, and potassium. But fewer understand the number that quietly determines whether those nutrients actually reach the plant: salt index. High-salt fertilizers — most conventional synthetics — push soil EC up with every application, stressing roots and suppressing the microbial activity that makes nutrients available in the first place.
Field trials across Idaho potato operations showed measurable EC reduction within a single season of switching to OA-Ag's carbon-based program. Yield response followed: +43 CWT per acre average in replicated trials. The formulations are 100% water-soluble, compatible with drip and sprinkler fertigation systems, and designed to integrate as a partial replacement — no equipment changes required.
"We saw measurable improvement in our soil EC readings within the first season. The plants responded immediately to the carbon-based program." — California Berry Grower, Strawberry Operations
If you're building a fertility program for the long term, salt index belongs in every product comparison. OA-Ag provides full salt index documentation for all products. Contact us for a product spec sheet or free soil analysis to see where your field stands.
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