CLAY-Lands, those abounding with clay, whether black, blue, yellow, white, &c. of which the black and the yellow are the best for corn.
All clay-soils are apt to chill the plants growing on them in moist seasons, as they retain too much water: in dry seasons, on the contrary, they turn hard and choke the plants. Their natural produce is weeds, goose-grass, large daisies, thistles, docks, poppies, &c. Some clay-soils will bear clover and rye-grass; and, if well manured, will produce the best grain: they hold manure the best of all lands; and the most proper for them are horse-dung, pigeon's dung, some kinds of marl, folding of sheep, malt-dust, ashes, chalk, lime, foot, &c.