Products
Every formula combines slow-release organic nutrients, humic acids and beneficial biology. Filter by product line, or open any product for its guaranteed analysis, application rates and documents.
Large-granule organic biofertilizers for broadcast spreading, soil incorporation and dry blending.
OMRI LISTED
Large Grade
Sigma’s base formula containing 100% organic and natural ingredients plus twice the concentration of biological additions compared to other dry formulas. Organic minerals such as carbon and humic acids work together to strengthen root growth and overall plant health. Apply “as is” or dry blend with conventional fertilizers to maximize performance.
OMRI LISTED
Large Grade
A balanced formula containing all the macronutrients plants need all season long. This premium-grade organic granular fertilizer contains nutrient-rich ingredients infused with value-added biologicals. Proprietary GranCORE Technology combines humic acid and essential nutrients such as NPK, Ca and Fe into a slow-release, easy-to-spread granule.
OMRI LISTED
Large Grade
A blend of fast and slow-release organic nutrient sources and value-added biologicals to fuel plants and recharge depleted soils, wherever a steady supply of nutrients is needed. Humic acids enrich the soil without burning roots, strengthening root growth and overall plant health. Apply as is, or dry blend with conventional fertilizers to maximize performance.
OMRI LISTED
Large Grade
Made with 100% organic and natural ingredients for applications that need higher nitrogen and potash with just the right amount of phosphorus. Beneficial microbes are granulated into a microbial food source for rapid nutrient cycling. Higher nitrogen, lower phosphorus and enhanced carbon make this multi-purpose fertilizer beneficial anywhere nutrients and biology are needed, with added potash for strong stem and root development.
OMRI LISTED
Large Grade
For higher organic nitrogen requirements, a value-added fertilizer functioning at the rhizosphere to fuel metabolic nutrient cycling and organic mineralization. Between the carbon-inducing and humic acid-rich content, your roots will have the nourishment needed for sustainable yields. Boost root growth and overall plant health with Sigma 7-2-1 true granular microbial fertilizer.
OMRI LISTED
Large Grade
Sigma's exclusive non-manure formula: an all-organic granular fertilizer made entirely from high-quality animal proteins, including meat, bone and blood meal. Designed for any application that needs higher nitrogen, it is enhanced with organic carbon minerals and humic acids for sustained, healthy growth, and releases nutrition slowly and completely over 8 to 12 weeks.
Micro-granular organic biofertilizers that spread evenly for consistent coverage.
OMRI LISTED
Fine Grade
This premium micro-granular fertilizer has a size grade number (SGN) of 110 and contains 100% organic, nutrient-rich ingredients infused with value-added biologicals. Humic acids and beneficial microorganisms work together to strengthen roots for greater absorption of water and nutrients, and the fine granule spreads evenly for consistent coverage.
Fine Grade
Sigma's 4-3-2 Bio formula with twice the concentration of value-added biologicals, produced in a fine (specialty) grade for even spreading. The label, SDS and full guaranteed analysis are available from Terra Elemental on request.
OMRI LISTED
Fine Grade
Sigma's 5-3-2 Bio in a fine (specialty) grade: a blend of fast and slow-release organic nutrients and value-added biologicals. Humic acids enrich the soil without burning roots, building strong, healthy plants through every season.
OMRI LISTED
Fine Grade
High nitrogen, high potassium and lower phosphorus make this a strong choice wherever phosphorus restrictions are in place. Produced in a fine (specialty) grade with value-added biologicals to build strong, healthy plants throughout the seasons.
High-performance turf blends: an organic base plus polymer-coated nitrogen for fast green-up and up to 10 weeks of steady feeding.
Bio Bridge · Turf Hybrid
A high-performance hybrid blend built specifically for turf. Sigma's 100% organic base fertilizer, with beneficial biologicals, is dry blended in a two-to-one ratio with polymer-coated sulfur-coated urea and other nutrients. The result is gradual, steady feeding for up to 10 weeks of plant response, while organic carbon and humic acids build healthier soil.
Bio Bridge · Turf Hybrid
Sigma 15-5-10 Bio Bridge provides fast green-up and recovery, while organic carbon and humic acids strengthen roots for greater nutrient absorption and add essential organic matter for soil microbes. Formulated for high performance turf.
Also available: Sigma 16-2-3 Bio Bridge. Another high-performance Bridge turf blend. Contact us for details and custom pricing.
Ask about 16-2-3Plant-available silicon from volcanic minerals to strengthen cell walls and plant resilience.
OMRI LISTED
Soil Amendment
Energize your soil with Sigma Si, a natural source of plant-available silicon that improves soil and strengthens plants, which can result in higher yields and more resilient growth. Mined from unprocessed volcanic tuff, it can be applied on its own or blended as a 10% inclusion with other Sigma granular products.
Start with our solutions guide for parks, athletic fields, landscapes and golf, or let us build a program around your sites.
Tell us about your sites and acreage. We'll recommend products and rates, send labels and SDS sheets for your files, and put together a formal quote.