Abstract
Each one clone of orchadgraes, perennial ryegrass and timothy was grown under some combination of air-and soil-temperatures. Greatest growth, in terms of dry matter production, plant height, leaf number, leaf size and tiller number, was obtained under 17-24°C and 24-17°C conditions associated with less DM% and less LB/LS+stem ratio. It may be effective for the promotion of growth to raise or drop soil-temperature by some managemental way when air-temperature is unfavorable for the growth.
