Compost and Biochar to Promote Soil Biological Activities under Sweet Potatoes Cultivation in a Subtropical Semiarid Region

Table 1

ICP-OES parameters for the analysis of K⁺ and Na⁺ for the various soil treatments.

Parameter	Instrumental settings
λna	588.983 nm
λk	766.455 nm
RF power	1500 W
Nebulizer	GemCone (low flow)
Plasma flow	15 L/min
Auxiliary flow	0.2 L/min
Nebulizer flow	0.55 L/min
Sample flow	1.50 mL/min
Injector	2.0 mm alumina
Spray chamber	Cyclonic
Integration time	20 seconds
Replicates	3