Objectives and Agronomic Importance of Primary Tillage
Following crop harvest, field soil is compacted by farm machinery traffic, livestock trampling, and irrigation wetting cycles. Primary tillage breaks this compacted surface layer.
Inverting the soil profile brings unexhausted deeper soil horizons to the surface, exposes overwintering insect pupae and fungal spores to solar heat and predatory birds, and incorporates surface organic matter into the root zone.
- Soil shattering: Opens dense, compacted soil down to 15-30 cm, facilitating rainwater infiltration
- Residue incorporation: Buries preceding crop stubble and weeds, accelerating microbial decomposition into humus
- Pest suppression: Exposes soil-borne insect grubs, pupae, and nematode cysts to scorching sun and birds
- Root penetration: Creates loose soil porosity that enables unrestricted taproot elongation in subsequent crops
Primary Tillage Implements and Mechanical Profiles
Tractor-drawn primary tillage implements are engineered to handle high soil draft forces, constructed with heat-treated high-carbon steel and boron alloy components.
Selecting the appropriate implement depends upon tractor engine horsepower, soil moisture content, and field stoniness.
- Mouldboard (MB) Plough: Inverts soil slices completely, burying top weeds and creating deep open furrows
- Reversible Hydraulic MB Plough: Features dual opposing mouldboard bottoms, allowing continuous back-and-forth ploughing without dead furrows
- Disc Plough: Heavy concave revolving discs suited for dry, hard, stony, or root-infested lands where standard MB shares would fracture
- Subsoiler & Chisel Plough: Deep chisel points operating up to 45-60 cm depth to shatter compacted hardpans without inverting subsoil horizons
Operational Soil Moisture and Power Matching
Performing primary tillage at the correct soil moisture content is critical: ploughing excessively wet soil destroys soil aggregate structure and causes severe puddling, while ploughing bone-dry soil produces massive unmanageable clods and strains tractor powertrains.
The ideal moisture window occurs when the soil is friable (at approximately 50 to 60 percent of field capacity), allowing soil slices to crumble smoothly off the mouldboard curve.
- Moisture check: Soil should hold a firm ball when squeezed in the palm but crumble easily when pressed with a thumb
- Horsepower matching: Ensure tractor draft capacity matches plough bottom count (e.g. 2-bottom plough for 40-45 HP; 3-bottom for 55+ HP)
- Speed control: Operate at 4 to 6 km/h in low-range gears to ensure steady draft and clean furrow inversion
- Safety and maintenance: Inspect shear bolts on plough standards and check share points for wear
Official source
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Common questions
What is the primary difference between primary and secondary tillage?
Primary tillage is the initial deep cut (15 to 30 cm) that opens and inverts hard ground, while secondary tillage (like harrowing or rotavating) pulverizes surface clods to prepare the final fine seedbed.
What is the benefit of a reversible hydraulic MB plough?
A reversible plough allows the operator to reverse furrow directions at headlands, maintaining a level field surface without creating center ridges or dead furrows.
Why is deep subsoiling performed once every 3 to 4 years?
Subsoiling shatters the dense plough-pan compacted by tractor wheels beneath the normal plough depth, restoring deep water drainage and root penetration.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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