HPM Penpyr-32 Herbicide - Pendimethalin 30% + Imazethapyr 2% EC for Soybean Weed Control

HPM Penpyr-32 is a selective, pre-mix herbicide designed specifically for Soybean crops. It contains two powerful active ingredients — Pendimethalin 30% and Imazethapyr 2% — in an Emulsifiable Concentrate (EC) formulation. This unique combination targets a wide range of annual grasses, broadleaf weeds, and tough sedges (including Motha) that commonly affect Soybean fields during the critical early growth stages.

Penpyr-32 works as a pre-emergence herbicide that must be applied within 0 to 3 days after sowing, before the crop or weeds emerge. It creates a chemical barrier on the soil surface that stops weed seeds from germinating and also provides some early post-emergence control of very young weeds. By keeping the field weed-free during the first 45 days, the Soybean crop gets full access to soil nutrients, moisture, and sunlight — leading to healthier plants and better yields. The product is available in 500 ml and 1 litre pack sizes.

What makes Penpyr-32 especially valuable for Soybean farmers is its dual mode of action. Pendimethalin stays in the top soil layer and prevents weed seeds from sprouting, while Imazethapyr is absorbed by roots and foliage to block essential protein production inside the weed. Together, they provide broad-spectrum control that single-ingredient herbicides cannot match, and also help reduce the risk of weed resistance.

Key Benefits

• Dual-action weed control: Two active ingredients with different modes of action work together to stop both germinating and early emerged weeds.
• Broad-spectrum coverage: Controls annual grasses, broadleaf weeds, and difficult sedges (Motha/Cyperus species) in a single spray.
• Long-lasting residual protection: Remains active in the topsoil for several weeks, preventing new weed germination and reducing the need for repeat sprays.
• Safe for Soybean crop: Specifically formulated to be selective — it targets weeds without harming the Soybean plants.
• Reduces weed resistance risk: Two different modes of action (K1 + B) make it harder for weeds to develop resistance compared to single-ingredient herbicides.
• Saves labour and time: One effective pre-emergence spray replaces multiple manual weeding rounds during the critical early crop stage.
• Weather-resilient performance: Pendimethalin binds tightly to soil particles, reducing leaching and maintaining effectiveness even with light rain.

How It Works

Penpyr-32 uses a "Double Attack" strategy to ensure no weed escapes. The first active ingredient, Pendimethalin (Group K1 - Microtubule Assembly Inhibitor), belongs to the Dinitroaniline chemical group. When sprayed on the soil, it forms a thin chemical layer on the surface. As weed seeds try to germinate and sprout, Pendimethalin stops cell division (mitosis) in the growing tips of roots and shoots. This kills the weed seedlings the moment they attempt to emerge from the soil — before they ever see sunlight.

The second active ingredient, Imazethapyr (Group B - ALS Inhibitor), belongs to the Imidazolinone chemical group. It is absorbed by both roots and foliage of weeds and moves systemically through the xylem and phloem (the plant's transport system). It accumulates in the meristematic regions (growing points) and blocks the ALS enzyme, which is essential for producing certain amino acids. Without these amino acids, the weed cannot make proteins and slowly starves from the inside out.

The synergy between these two ingredients is what makes Penpyr-32 so effective. Pendimethalin handles the grasses and stops them at the soil surface, while Imazethapyr targets broadleaf weeds and sedges that might escape the soil barrier. This combination provides complete protection across all weed types and also delays the development of herbicide resistance in the field.

Technical Specifications

Parameter	Details
Product Name	Penpyr-32 (HPM)
Active Ingredients	Pendimethalin 30% + Imazethapyr 2%
Formulation Type	EC (Emulsifiable Concentrate)
Chemical Group	Dinitroaniline + Imidazolinone
IRAC Mode of Action Code	Group K1 (Microtubule Assembly) + Group B (ALS Inhibitor)
Target Crop	Soybean
Pack Sizes Available	500 ml, 1 litre
Brand	HPM Chemicals

Recommended Dosage & Application

Crop	Dose (ml per Acre)	Water (L per Acre)	Dose (ml per Litre of Water)	PHI (Days)
Soybean	1000 - 1200 ml	200 - 240 L	~ 5 ml	90

Note: Using high water volume (200+ litres per acre) is critical for creating an even chemical barrier on the soil surface. Always follow the dose per acre for accurate results.

When to Use

Penpyr-32 must be applied strictly as a pre-emergence herbicide within 0 to 3 days after sowing (DAS). This is the most critical timing — the spray must be done before the Soybean crop emerges from the soil and before weeds begin to germinate. Do not wait for weeds to appear in the field, as the product works best as a preventive measure.

At the time of application, ensure the soil has sufficient moisture. Adequate soil moisture is essential to activate the herbicide and form an effective chemical barrier. Light irrigation or sufficient soil moisture from the last rain helps the product work properly. Avoid application on very dry soil or when heavy rain is expected immediately after spraying, as runoff may reduce effectiveness.

Step by Step Usage Instructions

1. Prepare the field: Ensure the Soybean field is properly leveled and has good soil moisture before sowing.
2. Sow the seeds: Complete sowing of Soybean seeds first.
3. Measure the dose: For one acre, measure 1000 to 1200 ml of Penpyr-32.
4. Mix with water: Fill the spray tank with clean water (200-240 litres per acre). Add the measured dose of Penpyr-32 and mix thoroughly.
5. Choose the right nozzle: Use a Flat Fan or Flood Jet nozzle for uniform soil coverage. Do not use hollow cone nozzles (which are used for insecticides).
6. Spray evenly: Apply the mixture uniformly across the entire field within 0 to 3 days after sowing. Ensure complete coverage of the soil surface.
7. Post-application: Do not disturb the soil after spraying, as this may break the chemical barrier. Avoid irrigation that causes runoff.

Precautions & Safety

• Personal Protective Equipment (PPE): Always wear gloves, a mask, and goggles during mixing and spraying.
• Handling: Avoid contact with skin and eyes. Do not inhale the spray mist.
• Hygiene: Wash hands and exposed skin thoroughly with soap and water after handling the product.
• Storage: Store in the original container in a cool, dry, and well-ventilated area away from direct sunlight and heat sources. Keep out of reach of children and pets.
• Environmental caution: This product is toxic to aquatic life. Do not use near fish ponds, water bodies, or aquaculture setups. Avoid contamination of water sources.
• Disposal: Follow proper disposal procedures for empty containers and unused product. Do not reuse containers for any other purpose.

Side Effects & Phytotoxicity

This product is specifically labeled for Soybean and is formulated to be safe for the crop when used as directed. Using it on other crops may cause damage. Follow the 90-day pre-harvest interval (PHI) before planting sensitive crops like mustard or vegetables in the same field after harvest. Due to the Pendimethalin content, the product is toxic to aquatic life — avoid runoff into water bodies.

PHI / REI & Storage

• PHI (Pre-Harvest Interval): 90 days for Soybean
• Shelf Life: Store in original container in cool, dry conditions away from sunlight