Step 1: Separate the sowing methods by seed flow pattern.
Sowing methods differ mainly in whether seed is released continuously or in discrete groups, and whether it falls in a furrow or on the open surface.
Step 2: Eliminate the non matching methods.
Broadcasting scatters seed over the open field surface, not into a furrow, so it is ruled out. Dibbling and hill dropping both place a fixed number of seeds at a time at set intervals, which is an intermittent, not continuous, flow.
Step 3: Match the remaining description.
A method that drops seed into a furrow as a continuous stream, metered by the feed mechanism as the machine moves forward, is exactly how a seed drill operates, and this continuous furrow placement is called drilling.
\[ \boxed{\text{Drilling}} \]