Table 10. Effects of spraying fulvic acid on reduction of malodor in composts based on measuring and calculating values

Item	Control	Fulvic acid	SEM	p-value
Measuring1)
Ammonia	126.3	107.2	-	-
Propionic acid	0.9	0.4	-	-
Butyric acid	0.7	0.6	-	-
I-Valeric acid	0.1	0.0	-	-
n-Valeric acid	0.1	0.0	-	-
Volatile organic compounds	2.6	1.5	-	-
Direct sensory method	5.7	3.7	-	-
Mean Calculating2)	19.5	16.2	1.9	0.265
Ammonia	5.4	3.8	-	-
Propionic acid	7.9	3.1	-	-
Butyric acid	5.7	3.8	-	-
I-Valeric acid	4.5	3.0	-	-
n-Valeric acid	6.5	3.8	-	-
Volatile organic compounds	8.3	3.6	-	-
Direct sensory method	5.4	2.7	-	-
Mean	6.3	3.3	0.4	0.001

The odors were measured by using gas chromatography with flame ionization detector.
The equations for the odors production were suggested by Nagata & Takeuchi (2003) [19].