Table 5

Enzyme activity	Equation(s)	R²*
Amylase activity	= -0.5643 + 3.37 OC	0.927
	= -15.1584 + 0.89 OC + 2.23 MC	0.997
	= 1.958 + 0.00452 TN	0.918
	= -38.37 + 0.00327 TN + 6.3 pH	0.998
	= -8.853 + 1.367 Clay	0.582
	= -19.598 + 0.201 Clay + 2.702 MC	0.995
Invertase activity	= -104.1 – 236 OC	0.909
	= -1215.7 + 321 OC + 709 BD	0.985
	= 73.609 + 0.315 TN	0.888
	= -654.3 + 93 Clay	0.531
	= 441.3 – 78 Clay + 372 OC	0.984
Protease activity	= -27.5281 + 55.9 OC	0.830
	= -0.6948 + 15.7 OC + 0.581 EP	0.998
	= 11.3733 + 0.082 TN	0.984
	= -0.4019 + 0.0656 TN + 14.2 OC	0.998
	= -145.12 + 20.54 Clay	0.427
	= -27.35 + 4.47 Clay + 0.0754 TN	0.998
	= -181.99 + 10.45 Clay + 0.0727 TN + 71 BD	0.999
Urease activity	= -4.3476 + 15.46 OC	0.927
	= 0.1819 + 8.5 OC + 0.0109 TN	0.996
	= 7.205 + 0.02074 TN	0.921
	= -27.131 + 0.01473 TN + 3.43 Slit + 14.9 BD	0.998
	= -41.7 + 6.2 Clay	0.569
	= -91.41 + 0.8 Clay + 12.5 MC	0.990
	= -181.16 + 5.75 Clay + 11.24 MC + 44.8 BD	0.998
	= -398.68 + 63.94 pH	0.734
	= -172.3 + 28.05 pH + 0.01518 TN	0.996
	= -271.48 + 40.21 pH + 0.01404 TN + 14.772 BD	0.998
Phosphatase activity	= -73.644 + 11.4 Clay	0.757
	= 7.126 – 1.2 Clay + 27.5 OC	0.990
	= -149.561 + 5.9 Clay + 23.1 OC + 68 BD	0.996
	= 19.8 + 0.2692 EP	0.746
	= -77.1 + 0.1181 EP + 9.63 Slit	0.990
	= -155.86 + 0.0927 EP + 12.82 Slit + 32 BD	0.996
	= -252.88 + 0.1065 EP + 6.72 Slit + 86 BD + 9.3 Clay	0.999
	= -693.25 + 112 pH	0.891
	= 87.93 – 14 pH + 28.3 OC	0.990
Dehydrogenase activity	= -0.36384 + 1.0629 OC	0.910
	= -0.01734 + 0.5305 OC + 0.00084 TN	0.994
	= -1.95461 + 0.8176 OC + 0.00061 TN + 1.1754 BD	0.998
	= -15.52356 + 0.2734 OC + 0.00085 TN + 1.5362 BD + 2.1088 pH	0.999
	= -2.829 + 0.514 Clay	0.530
	= 2.123 – 0.355 Clay + 1.68 OC	0.988
	= -1.797 – 0.192 Clay + 0.93 OC + 0.426 MC	0.997
	= -7.26 + 0.053 Clay + 0.61 OC + 0.531 MC + 1.95 BD	0.999

*All R²-values are significant at p<0.001. BD: Bulk density; MC: Moisture content; OC: Organic Carbon; TN: Total Nitrogen; EP: Extractable Phosphorous.

Table 5: Stepwise multiple regression analysis of soil enzymes (amylase, invertase, protease, urease, phosphatase and dehydrogenase) on soil physicochemical characteristics.