Table 5. The effect of drip irrigation treatment level on root morphological traits of 4 and 8-year-old Prunus×yedoensis containerized seedlings.

Irrigation treatment (L/year/tree)	Total root length (cm)	Root project area (cm2)	Root surface area (cm2)	Root diameter (mm)	Root volume (cm3)
4-year-old Prunus×yedoensis containerized seedling
232	11810.8±1216.7c	2571.5±407.0a	8078.5±766.5b	16.2±0.9a	537.6±31.3a
288	18981.1±1105.9a	3415.6±616.1a	10730.4±1305.5a	18.7±1.9a	636.6±81.9a
344	15058.1±607.2b	2722.9±552.8a	8554.4±1080.5b	18.0±1.7a	639.3±67.4a
F-value	37.8***	2.1NS	5.2*	2.2NS	2.5NS
8-year-old Prunus×yedoensis containerized seedling
360	30333.8±2238.8b	5737.8±145.0b	18025.9±3431.5b	32.0±3.3b	1056.4±57.6b
416	44389.7±2845.4a	7633.5±553.8a	23981.3±1317.9a	43.2±2.5a	1570.9±42.0a
472	44706.0±4121.3a	7328.6±568.1a	23023.4±1784.8a	33.2±4.2b	1154.1±89.0b
F-value	20.1**	14.3**	5.5*	9.9*	51.7***