Table 5 Direct and indirect effects of soil P fractions and soil enzyme activities on grain yield.

Factors	Direct effect coefficients	Indirect effect coefficients
Factors	Direct effect coefficients	NaHCO₃-Pi	NaHCO₃-Po	NaOH-Pi	NaOH-Po	HCl-P	Residue-P	Total-P	Dehydrogenase	β-glucosidase	Acid phosphatase	Urease
NaHCO₃-Pi	0.32		−0.31*	0.33*	−0.02	0.61*	−0.53*	0.29*	0.22	0.46*	−0.08	0.38*
NaHCO₃-Po	−0.15	−0.27*		0.18	−0.01	0.09	0.10	0.22	0.45*	0.49*	0.16	0.04
NaOH-Pi	0.27	0.24	0.15		0.01	−0.28	0.17	0.11	−0.02	0.06	0.03	−0.02
NaOH-Po	−0.16	−0.23	0.03	−0.14		−0.04	0.32*	0.07	−0.02	−0.01	0.01	−0.09
HCl-P	−0.23	−0.09	−0.15	0.09	0.02		0.06	0.45*	−0.04	−0.01	−0.23	−0.39*
Residue-P	−0.11	−0.29*	0.06	0.12	−0.04	0.48*		0.08	0.33*	0.05	0.01	−0.01
Total-P	−0.43	0.48*	0.41*	0.27	0.01	−0.38*	0.24		0.08	−0.11	0.41*	0.26
Dehydrogenase	0.18	0.12	0.27*	−0.01	−0.02	−0.03	0.32*	0.02		−0.17	0.11	−0.13
β-glucosidase	−0.17	−0.32*	0.38*	0.06	−0.01	−0.02	0.06	−0.04	−0.22		0.07	0.08
Acid phosphatase	0.41	−0.05	0.09	0.02	0.00	0.02	0.01	0.13	0.11	0.06		0.23
Urease	0.35	0.23	0.02	−0.02	0.00	−0.14	−0.01	0.09	−0.14	0.07	0.26

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