Table 6. Changes in CER of a 100-year-old Platycladus orientalis tree compared with those of five healthy trees during the six years of rootage period. Each number is an average of 12 measurements (Unit: kΩ).

A transplanted tree			Healthy trees		t-test	Remark
Date of Measurement	Mean	St. Dev.	Mean	St. Dev.
2018. 5. 10	13.5	1.33	11.2	1.79	n,s p=0.229	Two weeks after the transplanting.
2018. 7. 26	17.4	0.58	12.1	1.75	p=0.00283	Hot summer induced some stress.
2018. 9. 18	15.1	0.76	12.5	0.96	p=0.0156	Heat stress was reduced.
2019. 5. 15	12.8	1.29	10.2	1.24	p=0.0301	New shoots improved the health.
2019. 10. 11	18.3	1.50	13.8	0.76	p=0.0014	The CER increased toward autumn.
2020. 5. 14	20.9	2.06	11.3	1.85	p=0.00006	The health became worsen. Frequent foliar sprays were performed.
2020. 9. 21	18.4	0.93	13.4	1.03	p=0.0005	The health was not improved.
2021. 5. 20	11.3	1.89	11.0	1.45	n,s p=0.830	New shoots improved the health.
2021. 10. 28	21.4	1.40	17.7	2.78	n,s p=0.104	The CER increased toward autumn.
2022. 5. 25	16.2	0.72	11.5	1.30	p=0.0211	The formation of new shoots was delayed.
2022. 10. 21	17.3	0.76	17.3	1.26	n,s p=0.982	The CER increased toward autumn.
2023. 5. 19	11.6	0.25	10.0	1.08	n,s p=0.275	The health was recovered in five years.
2023. 10. 13	12.1	1.01	15.3	1.17	n.s p=0.285	The health was recovered in five years.
2024. 6. 14	12.8	1.91	11.4	0.96	n,s p=0.370	Interpreted as successful rootage.