Agricultural Fertilizer Storage: Tank Selection and Installation Guide
Agricultural Fertilizer Storage
Liquid fertilizer storage is one of the highest-volume applications for polyethylene tanks in North America. UAN (urea-ammonium nitrate) solutions, liquid phosphorus, potassium solutions, micronutrient blends, and specialty crop nutrients all require chemical-rated polyethylene storage with specific gravity ratings matched to the solution density. Getting this right means your fertilizer is ready when you need it. Getting it wrong means corroded fittings, tank failures during peak application season, and thousands of dollars of lost product.
Why Tank Selection Matters for Agricultural Fertilizer Storage
Not every polyethylene tank works for every application. The wrong tank can mean chemical incompatibility, premature failure, regulatory violations, or simply wasted money on features you don't need. This guide walks you through the specific requirements for agricultural fertilizer storage and matches you with the right tank from our catalog.
Key Requirements
- Chemical Rating — UAN-28 has a specific gravity of 1.28, UAN-32 is 1.32. Both require a minimum 1.5 SG tank rating.
- UV Resistance — Outdoor storage in direct sun requires UV-stabilized resin rated for continuous exposure.
- Complete Drainage — Fertilizer residue at the bottom of a flat-bottom tank can crystallize and clog fittings.
- Volume — Size for peak application season. A 1,000-gallon tank covers approximately 25 acres at 40 gal/acre.
Recommended Tank Types
Vertical Chemical Storage
The standard for farm fertilizer storage. SG 1.5+ rating handles all common fertilizer solutions. Flat-bottom design sits on a gravel pad.
Shop Vertical Chemical Storage
Cone Bottom Mixing Tanks
For operations that mix custom blends or need complete drainage between different fertilizer types.
Shop Cone Bottom Mixing Tanks
Installation Considerations for Agricultural Fertilizer Storage
Secondary Containment
EPA requires secondary containment for aggregate above-ground storage exceeding 1,320 gallons. Even below that threshold, containment is strongly recommended for fertilizer — a spill near a well or waterway creates serious environmental liability.
Winter Storage
UAN solutions freeze at approximately 0-5°F depending on concentration. If your operation shuts down in winter, either drain the tank or ensure it is protected from extended freezing. Ice expansion can crack even a properly rated tank.
Sizing Your Tank
Tank sizing for agricultural fertilizer storage depends on your usage rate, refill frequency, and peak demand. The general formula is:
Required Capacity = Daily Usage × Days Between Refills × 1.2 Safety Factor
The 1.2 safety factor accounts for peak usage days, delivery delays, and the fact that you should never run a tank completely dry (the sediment at the bottom can clog fittings and pumps). If your application has seasonal peaks, size for peak demand rather than average demand.
Maintenance Specific to Agricultural Fertilizer Storage
Standard polyethylene tank maintenance applies: quarterly visual inspection, fitting checks, foundation verification, and vent maintenance. For agricultural fertilizer storage specifically, pay extra attention to:
- Chemical compatibility: If you change chemicals or suppliers, verify the new formulation is compatible with polyethylene and within the tank's specific gravity rating before adding it to the tank.
- Residue buildup: Some liquids leave residue on tank walls over time. Annual interior inspection and cleaning prevents buildup from affecting liquid quality or reducing effective capacity.
- Fitting condition: Applications with frequent connect/disconnect cycles wear fittings faster. Replace threaded fittings at the first sign of thread damage — a cross-threaded or stripped fitting is a leak waiting to happen.
- Secondary containment: If required by your local regulations, inspect containment berms, dikes, or trays during each tank inspection. Secondary containment only works if it's intact.
Frequently Asked Questions
What size tank do I need for agricultural fertilizer storage?
Start with your daily usage rate and multiply by the number of days between refills, then add 20% for safety margin. For example, if you use 50 gallons per day and refill weekly, you need: 50 × 7 × 1.2 = 420 gallons minimum. Round up to the next standard size — in this case, 500 gallons.
Do I need a chemical-rated tank or a water-only tank?
If you are storing anything other than clean water, choose a chemical-rated tank (SG 1.5 or higher). The thicker walls and higher material rating provide safety margin for chemical exposure, and you won't need to replace the tank if you switch liquids later. Water-only tanks save money but limit your future options.
What permits do I need?
Permit requirements depend on your location, the tank size, and what you are storing. Water storage typically requires no permits below 5,000 gallons. Chemical storage often requires permits, secondary containment, and fire marshal review. Agricultural exemptions may apply for farm chemical storage. Always check with your local building department and fire authority before installation.
Can I install the tank myself?
For tanks under 500 gallons, DIY installation is straightforward if you follow proper site preparation and plumbing practices. For larger tanks, we recommend professional installation — the weight involved creates safety risks, and improper placement can void the warranty. Either way, a proper foundation is non-negotiable.
How do I handle delivery and placement?
Small tanks (under 200 gallons) ship via UPS/FedEx ground. Mid-size tanks (200-1000 gallons) ship LTL on a pallet — you'll need a forklift or request liftgate delivery. Large tanks (1000+ gallons) ship via flatbed and require equipment for unloading. Call us to coordinate delivery logistics for your specific site conditions.
Need expert guidance on tank selection for agricultural fertilizer storage? Call (866) 418-1777 — we'll help you size, select, and plan your installation.