TABLE 7.

Analysis of variance (ANOVA) for response surface quadratic model for the nematicidal activity of Trichoderma longibrachiatum T6 culture filtrates.

Source	Sum of squares	df	Mean square	F-value	p-value
Model	1032.59	9	114.73	71.93	< 0.0001*
A. pH	100.04	1	100.04	62.72	< 0.0001*
B. Inoculation volume	14.07	1	14.07	8.82	0.0208*
C. Incubation day	51.61	1	51.61	32.36	0.0007*
AB	0.000	1	0.000	0.000	1.0000
AC	2.500E-005	1	2.500E-005	1.567E-005	0.9970
BC	4.77	1	4.77	2.99	0.1272
A2	418.78	1	418.78	262.57	< 0.0001*
B2	248.22	1	248.22	155.63	< 0.0001*
C2	111.70	1	111.70	70.03	< 0.0001*
Residual	11.16	7	1.59
Lack of fit	4.79	3	1.60	1.00	0.4789
Pure error	6.38	4	1.59
Cor total	1043.76	16

F is Fisher’s function; probability *p < 0.05 corresponds to significance.