Table 3.

Significance of regression coefficient of different methods used to estimate plant biomass from the plant area.

Model	Coefficient	Coefficient value	Std. Error	t	Sig.
Linear	a0[g]	-.043	.008	-5.517	.000
	a1[g/mm2]	.003	.000	80.412	.000
Quadratic	a0[g]	-.046	.011	-3.989	.000
	a1[g/mm2]	.003	.000	22.237	.000
	a2[g/mm4]	-1.002E-7	.000	-.347	.729
Cubic	a0[g]	-.065	.015	-4.231	.000
	a1[g/mm2]	.004	.000	11.123	.000
	a2[g/mm4]	-3.153E-6	.000	-1.911	.057
	a3[g/mm6]	4.458E-9	.000	1.879	.061
Power	a0[log(g)]	4.072E-4	.087	-89.243	.000
	a1[log(g)/log(mm2)]	1.348	.018	74.655	.000