Table 12.

pH of the cactus pear silages with different levels of gliricidia addition during air exposure times and BC, temperature and aerobic stability (AS).

Variables	Gliricidia levels					Equation	R²	SEM
	0	25	50	75	100
pH
48 h	4.68 ± 0.25b	3.92 ± 0.06a	3.98 ± 0.04b	4.11 ± 0.04a	5.01 ± 0.04a	Ŷ = 4.7 − 0.04 × 0.0004x²	96.86	0.133
96 h	5.99 ± 0.13a	4.38 ± 0.15a	4.49 ± 0.12a	4.05 ± 0.01a	5.00 ± 0.01a	Ŷ = 5.9 − 0.06x + 0.001x²	88.40	0.183
BC	7.81 ± 0.91	25.69 ± 4.12	29.16 ± 3.91	37.35 ± 4.01	46.54 ± 5.51	Ŷ = 11.189 + 0.3684x	91.03	0.613
Max temp (°C)	32.77 ± 0.84	29.67 ± 2.86	29.63 ± 1.15	27.97 ± 0.78	27.07 ± 0.38	Ŷ = 32.04 − 0.0524x	65.36	0.072
AS (h)	26.67 ± 5.21	57.67 ± 7.57	65.33 ± 11.73	71.67 ± 14.04	83.33 ± 13.51	Ŷ = 36.067 + 0.5013x	63.77	20.07

SEM = standard error of the mean; R² = coefficient of determination.

Averages followed by lowercase letters on the same column do not differ among themselves by t-test (P < 0.05)