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Back in the 1960s, agriculture wasn't a friend to weeds, but farmers didn't have the tools they wished for. Metribuzin came out of that frustration, dreamt up by chemists looking to spare crops and wipe out the most stubborn weeds. Over the years, the molecule found its way into the hands of growers across continents. They relied on it to knock down invaders in soybean, potato, tomato, and sugarcane fields, giving food producers a fighting chance against nature’s wild side. The story of metribuzin follows a wider shift in farm science: move away from brute force and broad sprays, focus instead on molecules that recognize the difference between crop and weed. That jump pushed food production forward, helping growers spend less on fuel and tillage, and putting food on more tables.
Metribuzin 97% offers a concentrated punch. It works as a selective, systemic herbicide, meaning it gets into the weed’s system and blocks photosynthesis, starving the plant from the inside. It stands out for tackling both broadleaf weeds and certain grasses, giving farmers room to breathe as their crops push up. Long after chemists first brought it to market, it remains an option in the modern grower’s toolbox, not just because it gets results, but because it’s shown resilience against weed resistance where some older products have faded out. Whether packaged as a granular product or as a suspension concentrate, it stays reliable season after season, and its legacy shapes weed-control strategies around the world.
Metribuzin in its technical-grade form shows up as an off-white to pale yellow crystalline powder, which doesn’t dissolve well in water but goes readily into organic solvents like acetone or methanol. Its moderate vapor pressure and thermal stability mean it can be stored without much fuss, a point that matters on the farm and in storage warehouses across climates. From a chemistry angle, this molecule brings together a triazinone structure that gives not only potency against weeds but also limits volatilization, keeping the product where the grower applies it. Beyond looks and chemical charts, these properties let the compound work its way through soil, reaching roots of weeds efficiently and breaking the grip of unwanted plants on precious land.
A jug or sack labeled “Metribuzin 97%” isn’t just regulatory red tape. Labels communicate more than a name and a number; they tell a grower how to protect workers, handle mixing and applications, and manage drift or runoff. Sealed containers carry batch codes, purity statements, net content, and explicit instructions for dilution, mixing, and safe storage. Current guidance doesn’t stop at language. It embeds QR codes and digital traceability for audits and recalls, ensuring a chain of responsibility back to the chemist’s lab bench. Local regulators check these details, but the grower – always – ends up with the last word: follow the label or risk crop loss, environmental harm, or tough scrutiny from authorities. Hardcore record-keeping and regular label updates keep the system fair, letting responsible users benefit and pushing out careless actors.
Synthesizing metribuzin follows a dance among triazine chemistry, starting with cyanuric chloride and methylthio derivatives. Industrial plants batch-react the ingredients under controlled heat and pressure, manage exotherms with cooling, and wash away impurities like unreacted starting materials or secondary byproducts. Purification leans on solvent extraction and crystallization, separating the technical-grade material from residues. In some places, spent solvents get regenerated for the next batch, supporting leaner operations and less environmental liability. Honest assessment of each step, from raw sourcing to final packaging, keeps the process robust and stops contamination before it turns into a farm or food chain problem.
While metribuzin follows a well-established synthesis route, chemists explore tweaks that alter side chains and ring structures. Different substituents change how the molecule interacts with specific enzymes in weeds, raising or lowering its impact on target species. Some modifications seek to reduce environmental persistence, making molecules that break down faster in soil. Others address regulatory headaches, with alternative derivatives aiming for lower toxicity profiles for non-target organisms. These minor bends in chemical structure come from lab work, field testing, and ongoing international conversations between makers and regulators. Chemical modification holds out hope for more tailored weed control, even as resistance patterns shift across agricultural landscapes.
Anyone who spends time in the field or reading shipment manifests sees more than one name for metribuzin. Chemists jot down “4-Amino-6-tert-butyl-3-(methylthio)-1,2,4-triazin-5(4H)-one.” In trade, it lands on shelves as Sencor, Lexone, and various generic identities, each carrying slight differences in formulation or packaging based on manufacturer and region. These synonyms reflect patent expiries, regional registration, and branding strategies, but the backbone molecule stays the same. Growers don’t lose sleep over chemical names, but knowing what’s inside matters every season, especially with look-alike or counterfeit products flooding some markets. Trusted naming systems help demystify the jumble of trade labels and keep things honest between seller and buyer.
Using metribuzin brings strict safety routines. Mixing and loading demand gloves, goggles, and fit-tested respirators in poorly ventilated sheds. The powder may cause skin irritation or respiratory discomfort if handled without care. Pesticide exposure stories are handed down among farmworkers: take shortcuts, pay the price later. Emergency protocols, Material Safety Data Sheets (MSDS), and spill kits cut down accidents, but only if everyone in the operation pays attention during training. National and international oversight – including the EPA in the United States, EFSA in Europe, and countless other bodies – tie together labeling, applicator licensing, runoff management, and drift reduction. Responsible handlers wash up after work and store concentrate under lock and key. Safety culture isn’t a bureaucratic burden; it’s the line between solid livelihoods and tragedy.
Metribuzin’s reach extends into nearly every region where soybeans, potatoes, tomatoes, sugarcane, or wheat set root. Each crop gives metribuzin its own rhythm: timing, rates, tank-mix partners, and the specifics of local weeds. In the North American Midwest, growers count on it for broadleaf control in soybean rotations. In India and Brazil, its role in sugarcane battles heavy weed pressure that could stunt yields. Australian tomato and potato regions prize it for consistent performance against species resistant to older herbicides. The molecule is versatile enough to enter pre-plant, pre-emergence, or post-emergence programs, supporting integrated weed control strategies that slow resistance and keep land productive year after year.
Inside university labs or agricultural tech companies, researchers return to metribuzin year after year. They test combinations with adjuvants that improve leaf uptake, soil binding, or consistency across unpredictable weather. Studies follow its movement in soil and water, asking tough questions about residue, crop safety, and risk to nearby waterways. Innovations now focus on formulations that reduce drift, lower volatility, and improve safety margins for both operator and bystander. In places where herbicide resistance looms larger every season, metribuzin appears in rotation trials, stacked with other chemistries to slow down the weed arms race. R&D never sleeps; even as the molecule ages, the need to tune it for changing crops, regulatory demands, and consumer pressure keeps the science active.
Toxicology remains at the core of public debate around crop protection. On the animal side, researchers have logged data for nearly fifty years: acute oral LD50s for rats hover in the moderate category, while skin absorption poses low risk except in rare, careless exposures. Fish and aquatic life see more sensitivity, especially if run-off follows heavy rainfall or over-application near water bodies. Human studies flag no strong carcinogenic or mutagenic linkage, but regulatory agencies still enforce strict drinking water limits to err on the side of caution. Modern risk assessments follow real-world data from field exposure and laboratory studies, giving a clearer picture than numbers in a table. Growers, advocates, and regulators continue to ask for lower impact on bees, birds, and the food web — and while metribuzin doesn’t top the toxicity charts, vigilance stays high. The call for alternative modes of action, lower application rates, and better runoff controls isn’t going away.
Metribuzin’s tomorrow doesn’t look like its yesterday. Weeds change, climates shift, and consumers grow more wary of every molecule touching their dinner plate. Chemical companies look to blend metribuzin with biologicals, pairing heritage chemistry with microbes and natural extracts to outsmart resistance and cut residues. Digital agriculture — with drones, sensors, and GPS mapping — aims to put just enough product, just where it’s needed, and zap waste to zero. Policy circles debate phasing out synthetic actives, but real-world yields and economics keep pushing for balanced, science-based decisions. Future prospects rest on earning public trust, showing transparency in research, supporting stewardship among users, and pressing for ongoing improvement in safety. The big picture: crops must feed billions, but the method matters as much as the harvest. Open minds, rigorous science, and farmer experience shape the next steps for this tried-and-tested herbicide.
Anyone involved with row crop farming runs into herbicide decisions every season. Metribuzin 97% has built a reputation as a reliable tool for controlling broadleaf weeds and some grasses. But I’ve seen many operations run into trouble after guessing at application rates, often leaving money on the table or risking crop damage. The right rate keeps weeds under control without stunting what you worked so hard to plant.
According to federal and state guidelines, the recommended application rate for Metribuzin 97% usually falls between 0.33 to 0.75 pounds of active ingredient per acre for pre-emergence use in soybeans. That covers most soil types and weed pressures but does not fit every situation perfectly. On lighter soils, lower rates often do the job; heavier soils or high-residue fields can require those higher amounts. Years in the field have taught me that testing small patches or working with your agronomist before going over a hundred acres saves headaches down the road.
Corn demands even more care. Many soil-applied corn herbicide programs recommend using as much as 0.5 to 1.3 pounds per acre, all depending on the specific product formulations and weed spectrum. Each crop label gives a tight window for timing and rate. Reading and following label directions does more than keep fields safe—it keeps you within the law. The Environmental Protection Agency (EPA) and state ag departments run spot checks, and misuse can cost your farm more than just one year’s profit.
Soil texture, moisture, organic matter, tillage, and previous weather patterns all steer how well Metribuzin works. In my experience, sandy soils let Metribuzin move quickly, which can hurt seedlings if rates run too high or if there’s a heavy rain right after spraying. High organic matter ties up herbicides, letting some weeds slide through unless you bump the rate—not too much, though, since rates over the cap can burn crops. Fields left with lots of residue after last harvest need extra care. Cover crops and no-till add more variables, sometimes pushing for split applications so Metribuzin works without hurting seedling roots.
Adding Metribuzin to tank mixes with other herbicides has saved me from multiple flushes of weeds later in the summer, but tank mixing always means checking compatibility. One slip in calculation leads to antagonism, crop injury, or ineffective weed control. Scale and calibrate equipment for each field; one size never fits all.
Facts back up what many in agriculture already know: resistant weed populations increase when rates are too low or applications are irregular. University of Illinois research points to a surge in waterhemp and Palmer amaranth resistance tied to suboptimal rates or single-mode herbicide programs. The solution sits in adopting an integrated weed management program—rotating herbicides, rotating crops, and never relying on one chemistry year over year. Keeping updated on extension bulletins and joining conversations with other farmers helps everyone stay ahead of changing resistance patterns and environmental rules.
The right application rate for Metribuzin 97% doesn’t start and end with the label. It comes from working with local experts, learning from past seasons, and keeping detailed records. With herbicide prices climbing, spraying less seems tempting, but skipping best practice often leads to even higher costs later. Relying on trusted guidelines, careful measurement, and a willingness to adapt creates the best shot at a clean, productive field every time.
Plenty of farmers ask themselves: what should I spray Metribuzin 97% on? Folks see this herbicide in shops, and the label lists a handful of crops, but the best fit usually comes down to potatoes, soybeans, tomatoes, and sugarcane. Wheat and certain types of beans also get added to the mix in some places. Each crop handles Metribuzin’s touch a little differently—and that all boils down to the way their roots and leaves process chemicals in the soil.
You run across two kinds of advice with weedkillers: chemical reps pitching promises and old timers recalling seasons when careless spraying gave them twisted leaves and light yields. My neighbor once lost half a potato run after pushing the dose to “really clean up.” The label says don’t do that. Years of watching plots across three counties tells me potatoes and soybeans are safe bets if you follow label rates and keep an eye on the weather. Heavy rain soon after application can move the chemical down where roots get a bigger dose than they like.
Why do soybeans and potatoes make the list while crops like lettuce or corn don’t? Some plants break down Metribuzin fast, turning it harmless before it messes with growth. Soybeans, for one, come built with enzymes that slice through Metribuzin, so the roots and shoots stay unaffected. Tomatoes and sugarcane handle it about the same way—if they’re not stressed to start with. I’ve worked with tomato growers who’ve learned that, in sandy soils without much organic matter, a little too much product burns young plants. Getting rates dialed in right looks simple but often takes a couple seasons of trial and error.
Rain, soil type, and temperature shape success. In heavy, clay-rich soils, Metribuzin lingers near the roots, so rates need dialing back. Light soils or unexpected cold snaps can push sensitive varieties over the edge. In my patch, fields with good drainage and plenty of organic matter offer a safety net. Sandy soils demand extra care or even skipping a plot some years.
One thing that’s clear: spraying Metribuzin as a catch-all leads to trouble. Young crops or stressed fields risk injury. Careful rotation matters—a soybean patch sprayed one year can hurt next year’s sweet corn or celery if leftovers hang around. Reading local herbicide guides pays off; they’re filled with region-tested advice. Crop advisers suggest pairing Metribuzin with other weed control strategies—cover crops or mechanical cultivation—to spread out risk and keep weeds guessing. Over-reliance on one herbicide can raise resistance in weed populations within a few years.
Sustainability counts for more every year. Careful use of Metribuzin on the right crops—sticking to potatoes, soybeans, tomatoes, wheat, and sugarcane, picking fields with compatible soils, and respecting crop rotation windows—guards both yield and soil health. When you ask experienced growers what built trust in a product, it’s usually the seasons of slow learning, not just what’s written on a label.
Sticking to proven crops, reading up on local extension bulletins, adjusting rates for the field in front of you, and rotating between herbicides are practical ways to get strong weed suppression and keep the soil in shape for years ahead. The future hangs on these small decisions, not just what’s shipped in the jug.
Any grower who’s spent a season managing broadleaf weeds knows how stubborn certain plants can get. A field starts clean, seeds hit the ground, then lambsquarters and pigweed take over before your crop gets a chance. Metribuzin 97% doesn’t guarantee miracles, but it levels the playing field. I’ve watched neighbors rely on old standbys, only to see waterhemp shoot up like it owns the place. Bring in metribuzin, and the story changes — suddenly, those problem species don’t look so tough.
Real control comes from understanding which weeds give in to metribuzin and which laugh it off. Common ragweed, velvetleaf, and foxtail get knocked back reliably. Metribuzin takes broad aim at purslane, wild mustard, shepherd’s purse, smartweed, and the always-resilient chickweed. I’ve seen pretty consistent results on nightshade, tansy mustard, and wild radish as well.
Pigweed remains a standout — especially redroot and smooth pigweed. Goosegrass and crabgrass also shrink fast after metribuzin. In my experience, annual bluegrass and barnyardgrass show significant injury; you get real, season-long relief if application hits that preemergence window. It’s not just annuals: henbit, mallow, and catchweed bedstraw also check out early, making room for your crop.
No one tool handles every job. There’s frustration when aiming at tough perennials like Canada thistle or field bindweed — results turn spotty. Yellow nutsedge grins at anything less than a multi-mode approach. Resistance gets more press these days, with waterhemp and Palmer amaranth populations adapting. My region started seeing this shift before many folks believed the problem was real. The best answer isn’t to double down on any one product, but to rotate and stack modes of action. Tank mixes with glyphosate or other herbicides beat back survivors.
Timing makes or breaks herbicide action. I’ve noticed preemergence use of metribuzin brings the most predictable results, especially before weeds break above the soil line. In soybeans and potatoes, growers see better crop safety by sticking to recommended rates. Newcomers sometimes hope for magic by pushing higher doses, but sensitive crops don’t bounce back fast from mistakes.
Soil type shifts the story. Lighter soils allow more movement and easier uptake, which boosts control but also raises risk for crop injury. In heavier soils, results slow down. Organic matter ties up active ingredients — too much residue and your window for action shrinks. Farmers who scout and adjust plans to match their soils’ quirks walk away with healthier fields.
People trust what works. University extension specialists, long-time consultants, and fellow farmers agree — rotating chemistry and respecting label instructions protect not just this year’s crops, but the future of the land. Metribuzin still has a seat at the table, but relying on it alone leads down the same road glyphosate traveled. County weed boards and agronomists hammer home: know what’s in your fields, apply the right rate for your soil, and always have a backup plan. With every planting season, farmers stack up their own evidence on what works, making weed management as much art as science.
Most people working the land pay attention to what chemicals touch their crops. Pre-harvest interval (PHI) isn’t a buzzword—it's a key to putting safe, market-ready food on the table. The PHI stands for the time between spraying a chemical like Metribuzin 97% and harvesting that crop. Ignore it, and there’s a risk of sending produce with residue levels above legal limits. For growers with even one season under their belt, watching this interval protects not only the end consumer but also their business reputation and future market access.
Metribuzin 97% acts as a selective herbicide commonly used in soybeans, potatoes, tomatoes, and wheat. Judging from the field advice passed down to me by my neighbors and seen in extension bulletins, this active ingredient knocks out problem weeds before they steal moisture and nutrients. The catch is that its residue can stick around inside plant tissue. That’s where the PHI comes into play.
For soybeans, the pre-harvest interval sits at about 60 days. In potatoes, 60 days also marks the safe window. Tomatoes usually require 7 days, and wheat goes up to 20 days. These numbers aren't suggestions. They come from real-world residue trials and food safety testing done by regulators including the Environmental Protection Agency (EPA). Nobody wants to send off crops with pesticide levels above the maximum residue limit—this can lead to destroyed shipments and legal fines.
Field work happens on a clock, not a calendar. Rain, heat, and plant growth all play a role in timing. Applying Metribuzin at the right crop stage shoots down early weeds before they get established, but plan poorly and a late spray can push harvest dates back or worse, mean skipping a market window altogether. My own family managed a potato farm for years, and crop buyers demanded we hand over spray records at every pickup. A crop tested with residue above the legal threshold brings real consequences.
Farmers aren’t the only ones invested. Food processors, distributers, and consumers each have a stake. Unsafe food damages trust and can lead to recalls or illness. Good agricultural practice urges everyone to keep spray logs, cross-check chemicals and application rates, and work within the recommended timings. Local extension offices and regulatory agencies offer free advice and easy-to-read charts for keeping PHI compliance front and center.
The challenge isn’t just following the rules, but also squeezing out the best yield possible without cutting corners. Starting with a detailed field calendar, growers can plan ahead—applying Metribuzin after weeds emerge but well before the plant matures. Rotating herbicides helps keep weed resistance in check, and scouting fields every week after application gives growers a heads-up of any surprises. Nobody likes discovering a chemical drifted into the wrong crop, or that residue testing at the elevator puts an entire load in question.
Digital apps now provide reminders for PHI countdowns, taking some stress off already busy hands. Still, the most important habit remains checking the product label every season. Regulations change, and skipping this step risks more than profits. Putting food safety first protects the farm, the reputation, and the community at large.
Metribuzin 97% pushes up yields by knocking down weeds, but this product brings risks. I’ve walked through plenty of farm sheds where chemical jugs gather dust, and the rule stands: even trusted products can go wrong in a hurry if you don’t take care. It sits among the more potent herbicides, with enough muscle to irritate the skin or eyes, and breathing in dust isn’t a small matter either. The label isn’t just legalese. Every step, from mixing to spraying, can bite back if you get careless. It only takes one splash to understand why gear matters.
On the farm, I learned to respect every chemical, no matter how familiar. We had a neighbor who thought gloves slowed him down. That habit lasted until he caught a rash that stuck around for days. Facts back that up. Direct contact with metribuzin powder or spray risks eye irritation and can burn skin. Breathing in the dust may hit the lungs and bring headaches, coughing, or even nausea. Reports from health agencies make it clear: protection isn’t just a line on the label—it’s how you keep yourself healthy year after year.
The right gear creates a real barrier between farm chemicals and your body. Strong, chemical-resistant gloves—nitrile or neoprene—not only last through the job but keep the powder from soaking through. Plain rubber dishwashing gloves won’t cut it here. Coveralls, preferably disposable or easy to wash, mean less chance of sneaky splashes clinging to jeans and shirts. Long sleeves and pants cover skin—not just for show, but because skin absorbs chemicals more than people realize.
Splash-proof goggles or a face shield guard your eyes. A regular pair of prescription glasses won’t offer real protection, and it’s hard to focus on the field when your eyes are watering from chemical dust. If the instructions mention it, a half-face respirator with organic vapor cartridges helps keep fine particles and vapor out of your lungs, especially in messy, windy conditions or enclosed spaces.
Mixing powders like metribuzin easily stirs up dust. Pour with care, away from the wind, and always below eye level. I always washed gloves before taking them off, over a bucket, never at the kitchen sink. That small detail means dirty runoff stays outside and out of the water system. If a spill happens—and eventually it will—you deal with it right then, using granulated absorbent, then sweeping up and bagging the waste, not spraying it into a ditch.
Clothes and gear touched by metribuzin need a wash separate from household laundry. Machinery and sprayers run with clean water after every job. Storing metribuzin straight up on a concrete floor with a drain is asking for trouble. It belongs in a locked cabinet, away from feed and where kids don’t roam. Labels on jugs spell out details for a reason; outdated or unlabeled containers should go straight to hazardous waste disposal.
Wearing the right protective equipment takes a few extra minutes, and those minutes add up to years of work without skin problems or lung trouble. Skipping gear for a “quick job” is a bet against the odds, and sooner or later, the odds win. Every extra step—gloves, goggles, coveralls—turns a risky job into a routine one. That habit outlasts a spray season and keeps folks farming for the long haul.
| Names | |
| Preferred IUPAC name | 4-amino-6-tert-butyl-3-(methylthio)-1,2,4-triazin-5(4H)-one |
| Pronunciation | /ˈmɛtrɪbjuːzɪn/ |
| Identifiers | |
| CAS Number | [21087-64-9] |
| 3D model (JSmol) | `C1=NC(=O)C2=NC(=S)N(C)N=C2N1` |
| Beilstein Reference | Beilstein Reference 2401261 |
| ChEBI | CHEBI:47913 |
| ChEMBL | CHEMBL16314 |
| ChemSpider | 5449 |
| DrugBank | DB08357 |
| ECHA InfoCard | String: "03b0e0df-4e71-488f-afb1-88d9d90a7f0a |
| EC Number | 210-406-1 |
| Gmelin Reference | 83492 |
| KEGG | C06587 |
| MeSH | 'D016692' |
| PubChem CID | 5086 |
| RTECS number | **PB6125000** |
| UNII | D0X3L670MY |
| UN number | UN3077 |
| CompTox Dashboard (EPA) | EPA CompTox Dashboard (DSSTox) ID: DTXSID3020516 |
| Properties | |
| Chemical formula | C8H14N4OS |
| Molar mass | 215.21 g/mol |
| Appearance | White to off-white crystalline powder |
| Odor | Odorless |
| Density | 1.30 g/cm³ |
| Solubility in water | 0.98 g/L (20 °C) |
| log P | 1.7 |
| Vapor pressure | 2.2 × 10⁻⁷ mmHg (25°C) |
| Acidity (pKa) | pKa = 1.0 |
| Basicity (pKb) | 11.1 |
| Magnetic susceptibility (χ) | -9.46 x 10⁻⁶ cm³/mol |
| Dipole moment | 2.95 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 0.329 kJ/mol·K |
| Std enthalpy of formation (ΔfH⦵298) | –31.8 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -4596 kJ/kg |
| Pharmacology | |
| ATC code | herbicides |
| Hazards | |
| Main hazards | Harmful if swallowed or inhaled. Causes eye and skin irritation. May cause damage to organs through prolonged or repeated exposure. Toxic to aquatic life with long lasting effects. |
| GHS labelling | GHS07, GHS08, GHS09 |
| Pictograms | SGH07, SGH09, SGH05 |
| Signal word | Warning |
| Hazard statements | H319: Causes serious eye irritation. H351: Suspected of causing cancer. H411: Toxic to aquatic life with long lasting effects. |
| Precautionary statements | P261, P264, P270, P271, P273, P280, P301+P312, P302+P352, P304+P340, P305+P351+P338, P308+P311, P330, P332+P313, P362+P364, P391, P403+P233, P405, P501 |
| NFPA 704 (fire diamond) | 2-1-1 |
| Flash point | Not classified |
| Autoignition temperature | 190°C |
| Lethal dose or concentration | LD₅₀ oral rat: 2100 mg/kg |
| LD50 (median dose) | LD50 (median dose): 2100 mg/kg |
| NIOSH | PC94577 |
| PEL (Permissible) | 1 mg/m³ |
| REL (Recommended) | 50 g/acre |
| Related compounds | |
| Related compounds |
Ametryn Prometryn Simazine Terbuthylazine Atrazine |
