Metribuzin Triazinone Preemergence Tank Selection

Metribuzin Triazinone Preemergence and Early-Postemergence Herbicide — Bulk Tank Selection at Ag-Retailer Distribution, Custom-Applicator Operations, Potato + Soybean + Tomato Specialty-Crop Service, and Row-Crop Production Agriculture

Metribuzin (CAS 21087-64-9; trade names Sencor 4 + Sencor 75 DF at Bayer + Tricor 4F at UPL + Glory 4L at Loveland + Metri-4 at Albaugh + Metribuzin 75 DF at multiple post-patent registrants) is a triazinone-class selective preemergence-surface and early-postemergence herbicide registered at U.S. soybean, potato, tomato, sugarcane, asparagus, alfalfa (post-establishment), small-grain (winter wheat + winter barley fall + early-spring), and certain field-crop + specialty-crop applications for control of annual broadleaves (pigweed; lambsquarters; nightshade; carpetweed; common ragweed; smartweed; velvetleaf; jimsonweed) and certain annual grasses (foxtail; barnyardgrass; fall panicum; goosegrass). The active ingredient is supplied at 4-lb-a.i./gal flowable suspension (Sencor 4 + Tricor 4F + Glory 4L) or 75% dry-flowable formulation at typical commercial product. Application timing is preemergence-surface, preplant-incorporated, or early-postemergence at 0.25-1.0 lb a.i. per acre depending on soil texture + organic matter + crop tolerance + target weed.

U.S. metribuzin consumption is concentrated at the soybean-belt (Iowa, Minnesota, Illinois, Indiana, Ohio, Missouri, Kansas, Nebraska, Wisconsin, Michigan, Pennsylvania, Tennessee, North Carolina, Mississippi, Arkansas, Louisiana plus regional soybean producers) preemergence-surface application + the U.S. potato-belt (Idaho, Washington, Wisconsin, Maine, North Dakota, Colorado, Michigan, Minnesota, Florida, California) preemergence + early-postemergence application + the asparagus + tomato + sugarcane specialty-crop application. Active U.S. registrants include Bayer Crop Science (Sencor brand at Research Triangle Park NC; original DuPont registration acquired by Bayer through Monsanto-DuPont asset transfer), UPL (Tricor 4F), Loveland Products (Glory 4L; Helena Agri-Enterprises house brand), Albaugh, ADAMA, FMC, and post-patent generic specialists. Bulk technical material is shipped at 2,500-gallon stainless tote + 250-gallon shuttle + 30-gallon drum + 2.5-gallon jug + 5-lb dry-flowable bag to U.S. ag-retailer + farmer-cooperative + custom-applicator stocking points. Storage envelope at ag-retail + co-op + custom-applicator: 4-lb-a.i./gal Sencor 4 / Tricor 4F flowable-suspension product is buffered at HDPE atmospheric tank in the 500-3,000 gallon range serving spring + early-summer + fall application windows.

The eight sections below cite EPA FIFRA registration framework for triazinone herbicides, Federal Insecticide Fungicide and Rodenticide Act 7 USC 136 et seq. labeling and tolerance compliance, EPA OPP Reregistration Eligibility Decision (RED) for metribuzin, OSHA Worker Protection Standard 40 CFR Part 170, EPA Pesticide Container Containment Rule 40 CFR Part 165 Subpart E, ASABE / ASAE S472 + S327 sprayer-calibration and application standards, EPA Endangered Species Act Bulletins Live framework, state-DEP groundwater monitoring programs, USDA NRCS conservation-practice standards (Code 595), ASTM D6692 + D6754 polyethylene tank specifications, and routine operating practice at North American ag-retail + co-op + custom-applicator metribuzin handling.

1. Material Compatibility Matrix

Formulated metribuzin 4-lb-a.i./gal Sencor 4 / Tricor 4F / Glory 4L flowable-suspension product is a buff-tan aqueous suspension at pH 6.5-8.0, containing the active ingredient suspended via wetting + dispersing surfactants + antifreeze + antifoam at typical formulation. The aqueous-flowable-suspension form has excellent material-compatibility with HDPE + standard elastomers + PVC + CPVC + stainless steel.

The dominant industrial pattern at North American ag-retailer + farmer-cooperative + custom-applicator metribuzin storage is HDPE rotomolded vertical atmospheric tank in the 500-3,000 gallon range with PVC + EPDM + Viton wetted plumbing + stainless-steel or PVC fittings + air-operated diaphragm transfer pump. OneSource Plastics' 5-brand HDPE network (Norwesco, Snyder Industries, Chem-Tainer, Enduraplas, Bushman) is the standard atmospheric storage platform at ag-retail + co-op triazinone herbicide distribution.

2. Real-World Industrial Use Cases

Soybean-Belt Ag-Retailer + Cooperative Bulk Stocking. Soybean-belt ag-retailers (Helena Agri-Enterprises, Wilbur-Ellis, Nutrien Ag Solutions, Simplot Grower Solutions, GROWMARK FS member cooperatives, CHS Inc., Land O'Lakes Truterra/WinField United, plus regional co-ops) operate retail-distribution facilities receiving bulk + mini-bulk + tote metribuzin at 1,000-3,000 gallon HDPE atmospheric tank, dispensing to soybean-grower mini-bulk tote + 30-gallon drum + sprayer field-tender during the spring preemergence application window (March-June across U.S. soybean geography).

Potato-Belt Custom-Applicator Operations. Idaho, Washington, Wisconsin, Maine, North Dakota, Colorado, Michigan, Minnesota, Florida, and California potato-belt custom application services maintain 500-2,000 gallon HDPE day-tank stocking metribuzin at primary custom-applicator branch + nurse-truck mini-bulk + sprayer-tender refill during the spring preemergence + early-postemergence application window at potato production. Metribuzin is a foundational potato-belt preemergence chemistry.

Tomato + Asparagus + Sugarcane Specialty-Crop Service. California + Florida + Indiana + Michigan tomato production + Michigan + Washington + California asparagus production + Louisiana + Florida + Texas sugarcane production deploys metribuzin at preemergence + early-postemergence application; specialty-belt ag-retail at 250-1,500 gallon HDPE bulk + tote stocking serves these crops at regional vegetable + sugarcane ag-retail.

Winter-Wheat Fall + Spring Application. Winter-wheat fall preemergence + early-spring postemergence metribuzin application (Texas, Oklahoma, Kansas, Nebraska, Colorado, Wyoming, Montana, North Dakota, South Dakota, Washington, Oregon, Idaho) for control of mustard + chickweed + henbit + speedwell + downy brome deploys 500-2,000 gallon HDPE day-tank at ag-retail + custom-applicator at fall-application window (October-December) and spring-application window (February-April).

Bulk Pesticide Storage Facility State-DOA Compliance. Bulk pesticide storage (typically >500 gallons aggregate at single facility) triggers state-DEP + state-DOA pesticide-storage-permit requirements imposing secondary-containment + spill-response + employee-training requirements; HDPE atmospheric storage with engineered HDPE secondary-containment pan is the dominant compliance solution.

Aerial-Application Service Centers. Aerial-applicator service centers (helicopter + fixed-wing ag-aviation operators across the soybean + potato + sugarcane belt) load metribuzin at 200-1,000 gallon HDPE day-tank at the aerial-loading pad with closed-transfer + nozzle-purge per EPA + state-aerial-applicator + FAA Part 137 framework.

3. Regulatory Framework

EPA FIFRA Registration. Metribuzin was federally registered at EPA in 1973 (Bayer / formerly Mobay Chemical). Product labels detail use-rate, crop, geographic, and reentry specifications under FIFRA 7 USC 136 enforcement framework. Metribuzin is not a Restricted Use Pesticide at U.S. registration.

EPA OPP RED + Registration Review. EPA Office of Pesticide Programs published the metribuzin Reregistration Eligibility Decision (RED) in 1998 with subsequent supplements addressing groundwater-detection-driven use limitations + worker-exposure mitigation + soil-incorporation specification. Metribuzin is mobile in soil + has been detected at low levels in vulnerable groundwater sub-basins; state-specific use limitations + groundwater-protection-area + setback restrictions are imposed at high-detection counties.

40 CFR Part 165 Pesticide Container Containment Rule. EPA's bulk-pesticide-storage rule applies to metribuzin bulk + mini-bulk storage at 500-gallon-aggregate threshold, with secondary-containment + impervious-pad + spill-response + record-keeping requirements.

OSHA Worker Protection Standard 40 CFR Part 170. Reentry interval at treated fields is 12 hours under standard application; protective-equipment requirements at handler include long-sleeve shirt + long pants + chemical-resistant gloves (Viton, butyl, nitrile, or PTFE) + chemical-splash goggles + closed-toe footwear at mixing-loading + open-system handling.

EPA Endangered Species Act Bulletins Live. Metribuzin application is subject to county-by-county Endangered Species Act use limitations published at EPA's Bulletins Live! Two system; aquatic-species + critical-habitat restrictions apply at high-rate applications.

FDA Tolerance Framework. Metribuzin tolerances at food crops are established at 40 CFR 180.332 covering soybean, potato, tomato, sugarcane, asparagus, small-grain, and additional commodity tolerances; tolerance levels typically range 0.05-3 ppm depending on crop + commodity. State-DOA + USDA Pesticide Data Program monitoring confirms compliance at finished food + feed.

State Groundwater-Protection-Area Restrictions. Wisconsin DATCP, Iowa DALS, Minnesota MDA, Nebraska DEE, Kansas KDHE groundwater-monitoring programs detect metribuzin at vulnerable sub-basins; state-specific use-rate-reduction or seasonal-window restrictions are imposed at high-detection counties.

4. Storage System Specification

Bulk-Storage Tank. Metribuzin 4-lb-a.i./gal Sencor 4 / Tricor 4F / Glory 4L formulated product bulk storage at HDPE rotomolded 500-3,000 gallon scale: standard HDPE resin per ASTM D1248 specification; vertical flat-bottom or conical-bottom vessel; 4-inch ANSI flanged top fill or 3-inch threaded top at smaller sizes; 3-inch flanged bottom outlet with PVC or CPVC ball valve; atmospheric vent with insect-screen + dust-cover; 18-24-inch top manway for inspection + cleaning access; ultrasonic or radar level transmitter with high-high alarm + low-low alarm; sample valve at 12 inches above bottom outlet for QC sampling; HDPE bulkhead fittings at all penetrations rated for 1.20-1.25 SG (metribuzin 4F approx 1.22 SG) and 100 deg F maximum service temperature; UV-stabilized exterior at outdoor installations.

Anti-Settling + Recirculation. Metribuzin flowable-suspension product can develop a slight bottom-concentration gradient at extended quiescent storage; tank specifications include optional in-tank propeller mixer (slow-RPM agitator at 30-60 RPM) or recirculation-loop pump (1-2 hour cycle daily) for periodic homogenization at long-term storage. Pre-application agitation of mini-bulk + tote + sprayer-tank is standard practice per product label.

Secondary Containment per 40 CFR Part 165. Bulk + mini-bulk pesticide storage at 500-gallon aggregate threshold requires impervious secondary containment with capacity equal to 110% of largest single vessel. HDPE secondary-containment pan, concrete-bermed pad with chemical-resistant coating, or steel-framed concrete-walled containment basin are standard.

Closed-Transfer System. EPA closed-system transfer requirements at refillable-container service eliminate operator exposure during transfer; HDPE bulk tank dispenses through dry-disconnect coupler to grower mini-bulk tote + sprayer-tender via metering pump; air-operated diaphragm pump at 8-25 gpm transfer rate.

Heat-Tracing + Freeze-Protection. Metribuzin flowable formulation suspension stability degrades below 32 deg F; northern installations require heated + insulated storage building or heat-traced + insulated bulk tank to maintain product stability through winter dormant storage. Self-regulating electric heat-trace cable + 2-inch closed-cell polyurethane insulation is the standard cold-weather package.

5. Field Handling Reality

Handler PPE. Mixer-loader-applicator PPE per metribuzin product label: long-sleeve shirt + long pants + chemical-resistant gloves (Viton, butyl, nitrile, or PTFE) + chemical-splash goggles + closed-toe footwear at mixing-loading. Closed-system handling per WPS engineering-control reduces PPE.

Tank-Truck Receipt + Mini-Bulk Transfer. Bulk metribuzin delivery is by 5,500-7,000 gallon DOT-406 stainless tanker at large ag-retailer; smaller volume by 1,000-2,500 gallon mini-bulk tote at typical mid-size + small ag-retail receiving. Tanker offload via plant-side air-operated diaphragm transfer pump at 25-100 gpm; transfer pipe is 2-3 inch PVC or CPVC + camlock or dry-disconnect + manual ball-valve isolation.

Sampling + Quality Control. Each tanker delivery requires sample collection at receipt for internal QC + supplier-COA verification: active ingredient content by HPLC, water content by Karl Fischer, pH by glass electrode, density at 20 deg C by hydrometer, particle-size distribution by sieve or laser-diffraction, color + clarity + suspension stability. Records retained 2-3 years for state-DOA audit.

Spill Response. Metribuzin is FIFRA-regulated environmental-hazard product. Spill response: contain to floor + secondary containment, sweep liquid via wet-vac or absorbent pad + sock to HDPE drum, neutralize residual via large-volume rinse to closed-loop holding tank for licensed disposal at hazardous-waste-treatment-storage-disposal facility (Clean Earth, Veolia, Heritage, Stericycle). State DEP + EPA National Response Center notification at any spill exceeding RQ; state-DOA notification at any incident-of-concern.

Tank Cleaning + Inspection. Annual tank inspection per facility 40 CFR Part 165 + state-DOA framework: drain to recovery tank, triple-rinse with potable water + ammonia or alkaline cleaner, neutralize rinse waste at on-site holding for licensed disposal, inspect interior for residue + caking at fill-line + outlet, refill at next campaign. Confined-space entry per OSHA 29 CFR 1910.146.

Compatibility With Other Pesticide Storage. Metribuzin storage should NOT be co-located with strong oxidizers (calcium hypochlorite, sodium hypochlorite, hydrogen peroxide), strong acids, or strong bases at adjacent secondary containment. Dedicated triazinone storage at separate containment + clear labeling prevents cross-contamination.

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