Subtopic: Functional requirements, principles of working, construction and operation of manual, animal, tractor and renewable energy operated equipment for tillage, sowing, planting, fertilizer application, inter-cultivation, spraying, mowing, chaff cutting, harvesting and threshing
Question Statement:
Which of the following furrow opener configurations is/are specially adapted for zero-till / direct-drilling seeders operating in heavy crop residue (such as standing paddy stubble)?
Options:
(A) Inverted-T type furrow opener
(B) Double disc furrow opener
(C) Shoe type furrow opener without rolling coulter
(D) Turbo-coulter followed by narrow-point tine
Answer Key:
A, B, D
Step-by-Step Solution & Explanation
- **A is correct:** Inverted-T openers create a narrow inverted-T slot that traps moisture and micro-climate while disturbing only minimal residue.
- **B is correct:** Double disc openers cleanly slice through surface mulch and trash without hairpinning or raking residue.
- **C is incorrect:** Blunt shoe openers have no cutting edge and drag trash, causing severe clogging in heavy paddy stubble.
- **D is correct:** Fluted/turbo coulters slice residue ahead of a narrow tine, allowing trash clearance without raking.