Last reviewed 1 Oct 2026 · 6 min read
Farm power
Farm power is the rate of doing work in agricultural operations — tillage, sowing, irrigation, harvesting, threshing, transport and processing. Its level and source strongly influence productivity, timeliness and drudgery. A farm's power availability is often measured in kW per hectare of cropped area; in India it has risen from very low levels to about 2 kW/ha (indicative; check the latest ICAR/Ministry figures) as tractors, pumps and other machines have spread.
Units
- Power ; the SI unit is the watt (W); 1 kW = 1000 W; 1 horsepower (hp) = 746 W (0.746 kW); 1 metric horsepower (PS) = 735.5 W.
- Energy: joule, kWh (3.6 MJ).
- Drawbar power (drawbar pull × speed).
Sources of power
| Source | Typical power | Notes |
|---|---|---|
| Human | 0.05–0.1 kW (sustained 0.075 kW ≈ 0.1 hp) | Hand tools, light operations; women and men both |
| Draught animals | 0.3–0.75 kW (bullock ≈ 0.5 hp, buffalo 0.6–0.7, camel and horse 0.7–1.0, mule and donkey less) | Tillage, transport; low speed 0.5–1.0 m/s |
| Tractor | 15–75 kW (20–100 hp) in common use | The main mechanical source |
| Power tiller | 5–15 hp | Small farms, wetland rice |
| Stationary engines | 2–15 kW | Pumps, threshers |
| Electric motors | 0.5–15 kW | Pumps, chaff cutters, processing |
| Renewable | solar, wind, biogas, biofuel | Pumping, lighting, cooking |
1. Human power
- A healthy adult can deliver about 0.1 hp (75 W) for sustained work and up to 0.4 hp for short bursts; efficiency about 20–25 % of the food energy.
- Energy expenditure (about 8–10 MJ/day for moderate work) depends on the task; ergonomics and drudgery reduction are important (improved hand tools, correct handle height and weight).
- Applications: hand weeding, planting, harvesting, hand tools and small implements, pedal-operated devices (pedal threshers).
2. Animal (draught) power
- Draught animals (bullocks, buffaloes, camels, horses, donkeys, mules) provide power for ploughing, harrowing, planting, interculture, carting, lifting water (Persian wheel), oil ghani, sugarcane crusher.
- Draught capacity: an animal can pull a load of about 10–12 % of its body weight at a working speed of 0.7–1.0 m/s for about 5–6 hours a day. A pair of bullocks of total weight 800 kg therefore develops a draught of roughly 80–100 kgf (about 800–1000 N).
Worked ExampleExample — bullock power
A pair of bullocks of weight 900 kg pulls a plough with a draught of 12 % of body weight ( N) at 0.8 m/s.
Power kW for the pair (about 0.42 kW or 0.57 hp per animal). Working a plough of width 0.2 m at 0.8 m/s, with a field efficiency of 70 %, the area covered is ha/h, i.e. about 0.2–0.25 ha in a 5–6 hour day.
- Advantages: low capital cost, produce manure and calves, can be fed on farm by-products, reliable in small farms, fuel independence. Disadvantages: low power and speed, limited hours, feed and care throughout the year (even when idle), land for fodder, delays in tillage.
- India has about 60–70 million draught animals (declining as tractors spread; check the latest livestock census).
3. Mechanical power
- Tractors (see the tractor topics) — the main source on larger farms, giving high power, speed and flexibility (pto and drawbar); power tillers for small plots and wet land.
- Internal-combustion engines (diesel, petrol, kerosene) — stationary engines for pumps, threshers, sprayers, small machines; self-propelled combines and harvesters.
- Advantages: high power, timeliness, ability to do heavy work, lower cost per hectare at large scale; disadvantages: high capital and fuel cost, repair and skill needs, fuel dependence, emissions.
4. Electrical power
- Electric motors (single-phase 0.5–3 hp, three-phase up to 20+ hp) drive irrigation pumps (the largest agricultural use), chaff cutters, threshers, grain graders and dryers, dairy and cold storage, poultry and processing.
- Advantages: clean, efficient (80–90 %), easy to control, low running cost, quiet. Limitations: availability and reliability of supply, voltage problems, rural electrification and tariffs, capital for motors and wiring, portability.
- Agriculture takes a significant share of India's electricity (roughly a fifth of consumption, mostly for pumping; check the latest data).
5. Renewable energy sources
| Source | Uses |
|---|---|
| Solar PV | Solar pumps (PM-KUSUM), lighting, fencing, cold storage, dryers |
| Solar thermal | Dryers, cookers, water heating |
| Wind | Windmill pumps, small turbines (in windy regions) |
| Biogas | Cooking, lighting, engines (dual fuel) from dung and farm waste |
| Biomass and producer gas | Heat for processing, gasifier-driven engines |
| Biodiesel and ethanol | Blended or neat fuels for engines (jatropha, pongamia, sugarcane ethanol) |
| Micro-hydro | Hilly regions |
- These reduce fuel imports and emissions and give energy access in remote areas (see the Renewable Energy subject).