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:
A tractor-operated 9-row precision planter has 16 cells on the metering plates. The speed ratio of the metering plates to the ground drive wheel is 1:2; rolling diameter of the drive wheel = 40 cm. Assuming no skid, find the plant-to-plant spacing in rows (mm).
Options:
(A) 39
(B) 50
(C) 157
(D) 314
Official Answer Key:
C
Step-by-Step Solution & Explanation
For one revolution of the ground wheel (distance = πD = π×400 mm), the metering plate turns ½ revolution (1:2 ratio), dropping 16×½ = 8 seeds. Spacing = πD/8 = π×400/8 ≈ 157.1 mm.
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