Discussion
The angular speed ratio of metering disc to ground wheel for obtaining the desired plant population is
Answer: A
The speed ratio is 0.125 : 1.
Allowing for 84% germination, the seeds to be sown are 44800/0.84 = 53333 per ha. With rows 0.75 m apart, one metre of row serves 0.75 m2, so:
\[ \begin{aligned} \text{seeds/m} &= 53333 \times 0.75/10000 = 4.0 \\ \text{seeds/wheel rev} &= 4.0 \times 1.693 = 6.77 \\ \text{ratio} &= 6.77/54 = 0.125 \end{aligned} \]
The 1.693 m per wheel revolution includes the 10% skid from Q52, which is why the pair is linked. Ignoring germination or the skid lowers the ratio below 0.125, and the larger ratios would sow far too many seeds per metre.
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