Glyphosate 41% SL Herbicide Uses

Glyphosate 41% SL (isopropylamine, or IPA, salt of glyphosate) is a non-selective, systemic herbicide of the glycine (phosphonomethyl-glycine) group, registered for use in India under the Insecticides Act, 1968, formulated as a soluble liquid (SL) concentrate. It is registered for post-emergence control of Johnson grass and other broadleaf and grassy weeds in non-cropped areas, and of grasses such as Cynodon dactylon, Imperata cylindrica and Paspalum in tea plantations. This page lists its mode of action, key benefits and the recommended dosage as per the Central Insecticides Board & Registration Committee (CIB&RC) official list of approved herbicide uses (Government of India).

Which Weeds Does This Control? (Field Identification Guide)

Not sure whether the weeds in your field match this herbicide's use case? This guide helps match weed identification to this herbicide's approved crop-wise uses.

Mode of Action

Glyphosate is an EPSP synthase inhibitor (HRAC Group 9, formerly Group G). Sprayed onto green foliage, it is absorbed through the leaves and moves with the plant's food stream (phloem) to the growing points, roots, rhizomes and underground runners. There it blocks the enzyme EPSPS, which plants need to make essential aromatic amino acids, so growth stops and the whole plant — including its underground parts — slowly dies. Symptoms are gradual: yellowing first appears on new growth within about a week and the weeds brown and die over 2–3 weeks. Glyphosate is quickly bound and inactivated on contact with soil, so it has no pre-emergence or residual soil action — it only works on weeds that are already up and green.

Features & Benefits

• Broad-spectrum, non-selective control of grasses, broadleaf weeds and sedges in non-cropped areas.
• Systemic action reaches the roots and rhizomes of hard-to-kill perennial grasses such as Johnson grass, Bermuda grass (doob) and cogon grass, reducing regrowth.
• No residual soil activity — it is inactivated on contact with soil, so it does not carry over in the soil to affect later sowings.
• The soluble liquid (SL) formulation mixes readily with water.
• Group 9 (EPSPS inhibitor) mode of action is a useful rotation partner with herbicides of other groups in an integrated weed-management program.

Recommended Usage of Glyphosate 41% SL Herbicide

The table below gives the recommended dose, water volume and waiting period per acre for each crop, converted from the CIB&RC-registered per-hectare rate — see the note below the table for conversion details. Always spray in the recommended water volume for uniform coverage, and confirm against the current product label before use.

Figures above are converted from the CIB&RC-registered per-hectare rates (1 ha ≈ 2.47 acres): Non-cropped area — 0.820–1.230 kg a.i./ha, 2.0–3.0 L formulation/ha, 500 L water/ha, PHI not stated by CIB; Tea — 0.820–1.230 kg a.i./ha, 2.0–3.0 L formulation/ha, 450 L water/ha, waiting period 21 days. Where CIB does not specify a PHI, no figure has been assumed — always confirm the current product label before use.

How to Use

1. Confirm the area matches this herbicide's approved use — a non-cropped area or a tea plantation — and identify the weeds present using the guide above.
2. Spray only when weeds are actively growing and green, with enough leaf area to absorb the spray; glyphosate does not act on weeds that have not yet emerged.
3. Measure the dose, add it to a partly filled spray tank and top up to the full volume with clean water while stirring; avoid muddy or turbid water, as soil particles bind and weaken glyphosate.
4. Use a knapsack sprayer fitted with a flat-fan or flood-jet nozzle and spray the weed foliage uniformly, using a hood or shield where needed to keep spray off desirable plants.
5. In tea, direct the spray at the weeds on the ground between and around the bushes, keeping it off the green leaves, stems and young shoots of the tea plants.
6. Spray in calm, dry weather; a rain-free period of several hours after spraying is needed for good uptake.
7. Do not cut, graze or cultivate the treated weeds for about a week after spraying, so the herbicide has time to move down to the roots and rhizomes.

Precautions & Safety

• Wear appropriate PPE — mask/respirator, gloves, goggles and full-sleeved clothing — while mixing and spraying, and avoid inhaling the spray mist.
• Glyphosate is non-selective and will damage or kill any green crop plant it is sprayed or drifts on — never spray over a standing crop and avoid drift onto neighbouring fields.
• Respect the 21-day waiting period (PHI) in tea before plucking leaf from the treated area; for non-cropped areas CIB does not state a PHI — do not graze animals on or cut fodder from treated areas, and follow the current product label.
• Glyphosate belongs to herbicide Group 9; avoid relying on it alone season after season, and rotate or combine with other weed-control methods to slow resistance development.
• Do not let spray, spray-tank washings or leftover solution reach ponds, canals, streams or drinking-water sources.
• Store in the original, tightly closed container in a cool, dry place away from direct sunlight, food and feed, and out of reach of children and livestock.
• Wash hands, face and any exposed skin thoroughly with soap and water after spraying, and change out of contaminated clothing before eating, drinking or smoking.

Brand names mentioned on this page are registered trademarks of their respective owners and are referenced here for identification purposes only; FarmMate is not affiliated with or endorsed by these brands. This page is for general information only — always consult your local agricultural extension office and confirm the current product label before use.