N-Ext RGS vs Humic DG: Liquid vs Granular Soil Biostimulants
Product specs below are estimates for planning purposes. Always verify against the current product label and your supplier's current listing before buying.
RGS (Root Growth Stimulant)
N-Ext
Humic DG
The Andersons
| Active ingredient | Humic and fulvic acids, kelp extract, micronutrient blend | Humic acid 12% (derived from Leonardite), granular carrier |
|---|---|---|
| Coverage rate | One 32 oz bottle covers up to ~25,000-32,000 sq ft at label low rate | One 40 lb bag covers ~10,000 to 16,000 sq ft (estimated) |
| Best for | Quick root stimulation after seeding, aeration, or heat/drought stress | Long-term granular soil-building program, easy to broadcast with fertilizer |
| Application method | Liquid concentrate, mix with water, apply with a hose-end or pump sprayer | Granular, apply with a broadcast or rotary spreader |
| Applicable zones | cool, warm, transition | cool, warm, transition |
| Where to find | DoMyOwn.com | SiteOne, DoMyOwn.com |
| Buy online | Buy on Amazon | |
| Grass Type Compatibility | ✓ Safe for all grass types | ✓ Safe for all grass types |
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Which Should You Choose?
Choose N-Ext RGS when you want a fast-acting liquid boost right after a stress event like seeding, aeration, or heat, and you already have a sprayer. Choose Humic DG when you want a set-and-forget granular product to build soil organic matter over a full season, broadcast alongside your regular fertilizer rounds.
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