Abstract
The present study was designed to clarify the changes in respiration of root of orchard grass, Italian ryegrass and Ladino clover by cutting. The results were as follows : 1. About the changes in the respiration of root of Italian ryegrass by the late fall cutting, it was showed that the respiratory activity was decreased rapidly, and thereafter continued a low level during the winter. 2. In relation to the seasonal fluctuation of root respiration by cutting treatment in orchard grass, it was showed that by repeating the cutting the respiratory rate was decreased considerably. By the first cutting the rate of respiratory activity of roots was depressed most severely and thereafter it maintained a low level untill the 2nd cut. Though the reduction by the 2nd cut was not so severe as that by the first cut, the respiratory rate of roots was lower than that in the time of the first cut, and it recovered a little before the 3rd cut. As the 3rd cut was conducted during mid summer, the respiratory activity showed considerable decline and regrowth was delayed because of the higher temperature. The decline in respiratory rate by the 4th cut was not so severe that the activity recovered rapidly, but it was obtained that the recovery of respiratory activity in the case of non-treatment of the 4th cut was better than that with the 4th cut treatment. 3. The respiratory activity of root of Ladino clover was depressed by the 3rd and 4th cutting treatments, but in general it recovered about two weeks after cutting
