Weed Density Mapping
Weed map for spot spray 90% chem save
Mission briefing
Weed Density Mapping sits in the growth stage of the crop cycle. It runs on a m3m + ai / xag revospray carrying rgb 20mp + ai weed model, and in Bihar the window is 20-30 das at a frequency of 1-2x. Expect roughly 100ha/hr per sortie, and stand the drone down outside the wind <8m/s envelope — flying past it wastes chemical and risks drift onto neighbouring plots. Readings are interpreted through ExG Excess Green, so the payload has to output those bands rather than plain RGB. Weed map for spot spray 90% chem save On a medium-difficulty mission like this, the cost driver is not the drone — it is the number of return trips and the pilot hours around them, which is what the payback maths on the economics page turns on.
What you need
- Payload
- RGB 20MP + AI Weed model
- Drone class
- M3M + AI / XAG RevoSpray
- Vegetation indices
- ExG Excess Green
When to fly (Bihar)
- Timing
- 20-30 DAS
- Frequency
- 1-2x
- Coverage
- 100ha/hr
- Weather envelope
- Wind <8m/s
Chemicals commonly loaded
High-frequency CIBRC-approved products in Bihar — check PHI and re-entry before you schedule this pass.
| Product | Target | Dose/ha | PHI |
|---|---|---|---|
| Chlorantraniliprole 18.4% SC | Stem borer, Leaf folder, Fruit borer, Bollworm, Fall armyworm, Pod borer, Tobacco caterpillar | 150-200 ml/ha | 7d |
| Emamectin Benzoate 5% SG | Bollworm, Diamondback moth, Fruit borer, Shoot borer, Pod borer, Thrips | 150-250 g/ha | 3d |
| Imidacloprid 17.8% SL | Hopper, Aphid, Whitefly, Jassid, Thrips, Scale insect | 250-500 ml/ha | 14d |
| Bispyribac Sodium 10% SC | Barnyard grass, Echinochloa, Sedges, Broadleaf weeds, Purple nutsedge | 250-400 ml/ha | 75d |
| Metsulfuron Methyl 20% WP | Bathua, Senji, Broadleaf weeds, Sedges, Parthenium, Motha | 20-30 g/ha | 60d |
What this pass costs to buy in
Custom-hire rates operators actually charge for spraying work. Use these as the benchmark before you decide whether to own a drone or hire one for weed density mapping.
| State | Job | ₹/acre | ₹/ha |
|---|---|---|---|
| Bihar | Spraying Rice | ₹450 | ₹1111 |
| Punjab | Spraying Rice | ₹500 | ₹1235 |
| Haryana | Spraying | ₹500 | ₹1235 |
| Uttar Pradesh West | Sugarcane Spraying | ₹520 | ₹1284 |
| Madhya Pradesh | Soybean Spraying | ₹520 | ₹1284 |
| Maharashtra | Sugarcane Spraying | ₹600 | ₹1482 |
Before you fly this mission
- DGCA rules for agricultural flying →
Green-zone limits, 120 m ceiling and the paperwork a spray sortie needs.
- Kisan Drone subsidy 2026 →
Up to 100% support for FPOs and CHCs buying the drone that runs this pass.
- Drone spraying cost per acre →
Chemical, water, battery and pilot cost broken down per acre.
- Pilot licence cost & RPTO list →
You cannot fly this commercially without a DGCA remote pilot certificate.