SECTION 17. Separation of land to other use; liability for conveyance or roll-back taxes; continuing qualification of remainder

If, by conveyance or other action of the owner thereof, a portion of land which is valued, assessed and taxed under the provisions of this chapter is separated for a use other than agricultural or horticultural, the land so separated shall be subject to liability for conveyance or roll-back taxes applicable thereto, but such separation shall not impair the right of the remainder of such land to continuance of valuation, assessment and taxation thereunder; provided, that such remaining land continues to qualify under the usage, minimum acreage and other provisions thereof.