''[[Bottom-heat]]''. A term used to designate the condition that arises when the roots of plants, or the soil in which they grow, are exposed to a higher temperature than that of the air in which the aerial parts are growing. | ''[[Bottom-heat]]''. A term used to designate the condition that arises when the roots of plants, or the soil in which they grow, are exposed to a higher temperature than that of the air in which the aerial parts are growing. |