The draft of a disc plough is significantly influenced by the width of the furrow slice. When the furrow width is excessive, the resistance encountered by the implement increases, leading to a heavier draft requirement for the tractor.

A land plane is a specialized piece of agricultural equipment designed primarily for the final smoothing and finishing of a field surface. While it assists in leveling, its specific mechanical design is optimized for achieving a uniform, smooth top finish after primary earth-moving or rough leveling operations have been completed by other implements.

In a reciprocating mower, registration refers to the alignment of the knife sections with the guards at the end of each stroke. Proper registration ensures that the knife sections center correctly in the guards, which minimizes energy loss and allows the mower to operate at minimum power requirements, ensuring efficient cutting performance and reduced mechanical strain during field operations.

The deshi plough is a traditional animal-drawn implement used for primary tillage. Its field capacity is relatively low compared to modern machinery, typically averaging around 0.4 hectares per day depending on soil conditions and the strength of the draft animals used.

A penetrometer is a specialized agricultural tool used to measure soil compaction and mechanical strength by recording the resistance encountered as a probe is pushed into the soil profile. This helps in identifying hardpans that restrict root growth.

Primary tillage involves deep soil inversion or breaking, such as ploughing. Secondary tillage, which includes harrowing, is performed after primary tillage to refine the seedbed, break clods, incorporate fertilizers, and control weeds, ensuring a fine tilth suitable for seed germination.

The provided answer suggests steel is not used, which may be counter-intuitive as steel is common in modern machinery. However, in traditional or specific low-cost agricultural contexts, rollers were historically made of wood or stone. This question may be based on a specific context where steel rollers are not the standard or are excluded for specific design reasons.

An offset disc harrow is designed with multiple gangs of discs to ensure thorough soil pulverization and leveling. While smaller models exist, larger or heavy-duty offset harrows often utilize a configuration involving 12 gangs to cover wider areas and provide the necessary weight and cutting action for primary tillage operations in various soil conditions.

Cultivators are essential implements for secondary tillage. They are classified based on their working mechanism, including disc cultivators for soil inversion, rotatory cultivators for pulverization, and tine cultivators for weed control and soil aeration.

A subsoiler is a heavy-duty tillage implement designed to penetrate deep into the soil profile to break up compacted layers, often referred to as a 'hard pan' or 'hand pan'. By shattering these dense subsurface layers, it improves root penetration, water infiltration, and soil aeration, which are critical for optimal crop growth in compacted fields.