Table 1.

L₉(3⁴) Orthogonal design of experiment.

Treatment	Strain	Dilution ratio	Inoculation method
T1	SSP2	1:30	IR
T2	SSP2	1:60	FS
T3	SSP2	1:90	IS
T4	JRP22	1:30	FS
T5	JRP22	1:60	IS
T6	JRP22	1:90	IR
T7	HRP2	1:30	IS
T8	HRP2	1:60	IR
T9	HRP2	1:90	FS
CK	–	–	IR

IR irrigation of the rhizosphere, FS foliar spray, IS irrigation of the rhizosphere + foliar spray.