Question

_____ is also known as Knife harrow.

• A. Acme harrow
• B. Patela
• C. Triangular harrow
• D. Spring tooth harrow

Hint:

Secondary tillage implements are often named after their cutting elements.
Harrows that use flat, curved steel blades to slice the soil are referred to as blade or knife harrows, of which the Acme harrow is a classic example.

Answer 1

The Correct Option is A

Harrows are secondary tillage implements used to pulverize, level, and prepare a clean seedbed after primary plowing.
They are classified based on the design of their working parts, which can be discs, tines, spikes, or blades.

Step 2: Detailed Explanation:
The Acme harrow is commonly referred to as a "knife harrow" or "blade harrow."
It consists of a heavy frame with curved, sloping steel blades or knives attached to it.
As the harrow is pulled across the field, these knives slice through the soil.
This action performs several key secondary tillage functions:
1. It cuts through clods, pulverizing and smoothing the soil surface.
2. It slices and destroys weed roots.
3. It levels the soil to prepare a uniform seedbed.
Let us compare this with the other options:
- Patela is a simple wooden plank or drag used primarily for leveling the soil and light surface compaction, rather than cutting.
- Triangular harrow consists of a triangular frame with fixed steel spikes (tines) used to break crusts and pull out weeds.
- Spring tooth harrow uses curved spring-steel tines that flex to bring clods to the surface and pull out deep-rooted weeds.

Step 3: Final Answer:
Therefore, the Acme harrow is the implement also known as the Knife harrow.