Exhaust air from a farrowing house used to heat a greenhouse

Abstract

Exhaust air from the Kansas State University swine farrowing house provides most of the heat needed in a greenhouse adjacent to it. The air apparently is not toxic to any of the vegetable plants tested. Tomato plants in the exhaust-air-heated greenhouse have grown faster and bigger, come into yield sooner, and produced several times more tomatoes than have plants grown in the control greenhouse heated by propane.