Abstract
For the purpose of promoting the use of the woody biomass as fuel for the greenhouse heating, it is necessary to know how to keep the thermal environment in the house at better conditions. In the case of hot-water heating, the temperature distribution in the greenhouse becomes uniform by increasing the heat transfer area of the hot-water supplying line. On the other hand, warm air heating has a possibility to give a stress to a plant locally. We consider that the hot-water heating is the easy heating method for a better thermal condition to the plant.