Table 5.

Correlation coefficients to assess the relationships among the parameters of RT, biomass accumulation, NUE, PUE, KUE, soil fertility, and soil enzyme activity.

	RT	DMAL	DMAS	DMAP	DMAT	NUE	PUE	KUE	AN	AP	AK	SOM	URE	SUC	DHA	ALP
RT	1
DMAL	0.63*	1
DMAS	0.67**	0.49*	1
DMAP	0.16	0.05	0.26	1
DMAT	0.84**	0.71**	0.75**	0.3	1
NUE	-0.09	-0.41	-0.35	-0.50*	-0.50*	1
PUE	0.36	0.49*	0.19	-0.21	0.32	0.02	1
KUE	-0.63*	-0.62*	-0.61*	-0.39	-0.73**	0.59*	-0.26	1
AN	0.54*	0.69**	0.63*	0.08	0.76**	-0.62**	0.42*	-0.63*	1
AP	0.71**	0.75**	0.72**	0.15	0.77**	-0.46*	0.54*	-0.63*	0.80**	1
AK	0.81**	0.68**	0.75**	0.07	0.81**	-0.39	0.46*	-0.80**	0.81**	0.83**	1
SOM	0.77**	0.61*	0.87**	0.07	0.82**	-0.35	0.46*	-0.67**	0.75**	0.88**	0.89**	1
URE	0.64*	0.76**	0.67**	0.23	0.83**	-0.65**	0.34	-0.69**	0.83**	0.88**	0.78**	0.79**	1
SUC	0.65**	0.59*	0.73**	-0.12	0.61*	-0.17	0.50*	-0.53*	0.57*	0.83**	0.79**	0.87**	0.70**	1
DHA	0.80**	0.73**	0.72**	-0.03	0.74**	-0.23	0.58*	-0.59*	0.68**	0.93**	0.84**	0.89**	0.80**	0.92**	1
ALP	0.79**	0.78**	0.77**	0.2	0.81**	-0.49*	0.49*	-0.80**	0.81**	0.93**	0.92**	0.89**	0.85**	0.81**	0.89**	1

RT: root yield, DMAL: DM accumulation in leaves, DMAS: DM accumulation in stems, DMAP: DM accumulation in petioles, DMAT: DM accumulation in tuberous roots, NUE: N utilization efficiency, PUE: P utilization efficiency, KUE: K utilization efficiency, AN: alkali-hydrolyzable N content, AP: available P content, AK: available K content, SOM: soil organic matter, URE: urease activity, SUC: sucrase activity, DHA: dehydrogenase activity, ALP: alkaline phosphatase activity.