TABLE 4.

Direct and indirect path coefficient values of soil and leaf factors on crop yields.

	Urease	Invertase	AP	Available K	Available P	SOM
Urease	−0.851	0.58	−0.01	0.24	0.28	0.46
Invertase	−0.66	0.761	0.00	0.35	0.10	0.35
AP	−0.10	−0.03	−0.058	−0.13	0.37	0.20
Available K	−0.44	0.56	0.02	0.469	−0.08	0.14
Available P	−0.45	0.15	−0.04	−0.07	0.532	0.14
SOM	−0.56	0.38	−0.02	0.09	0.11	0.704
	NR	GS	SPS	SS	soluble sugar	chlorophyll
NR	−0.167	−0.41	0.34	0.26	0.34	−0.04
GS	−0.08	−1.046	0.37	0.74	0.52	−0.07
SPS	0.01	0.67	−0.580	−0.06	−0.23	0.05
SS	−0.15	−0.66	0.03	1.183	0.45	−0.06
Soluble Sugar	−0.12	−0.80	0.20	0.77	0.683	−0.07
Chlorophyll	−0.09	−0.75	0.31	0.69	0.48	−0.096

Bold numerals are the direct effect values. AP, acid phosphatase; K, potassium; P, phosphorus; SOM, soil organic matter; NR, nitrate reductase; GS, glutamine synthetase; SS, sucrose synthase; SPS, sucrose phosphate synthase.