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A 9 * 20 cm fluted roller type seed drill is operated at a forward speed of 3 km h^-1 in a field of size 120 m * 90 m. The effective ground wheel diameter of the seed drill is 0.5 m and the ratio of ground wheel rpm to the fluted roller rpm is 2. For one complete rotation of each fluted roller, 6.8 g seed is transferred from the seed box to the seed tube. The average time taken for each turn while operating length-wise is 50 s and the total time wasted in refilling the seed box for sowing the entire field is 40 min.

The actual field capacity of the machine in ha h^-1 is

0.30

0.32

0.36

0.40

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