A two-row horizontal plate potato planter with $0.6 \mathrm{~m}$ ridge spacing has 9 cups on each seed plate of $0.4 \mathrm{~m}$ diameter. For each revolution of the ground wheel, the seed plate makes half a revolution. The diameter of the ground wheel is $0.5 \mathrm{~m}$. If the planter uses cut tubers each of $25 \mathrm{~g}$ mass, the seed rate in $\mathrm{kg} \mathrm{ha}^{-1}$ is________________

A two-row horizontal plate potato planter with $0.6 \mathrm{~m}$ ridge spacing has 9 cups on each seed plate of $0.4 \mathrm{~m}$ diameter. For each revolution of the ground wheel, the seed plate makes half a revolution. The diameter of the ground wheel is $0.5 \mathrm{~m}$. If the planter uses cut tubers each of $25 \mathrm{~g}$ mass, the seed rate in $\mathrm{kg} \mathrm{ha}^{-1}$ is________________

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