Evaluation of preservation methods for improving biogas production and enzymatic conversion yields of annual crops

Table 3 Chemical composition of fresh faba bean before and after ensiling for 4 and 8 months without or with formic acid (0.5% of fresh material)

Components, percentage of dry matter	Fresh	Ensiled without additives		Ensiled with formic acid
	Month 0	Month 4	Month 8	Month 4	Month 8
Dry matter, %	24.4	24.7	25.7	25.8	24.8
WSC^a	5.9	3.3	3.7	8.2	18.3
Glucose	3.6	1.2	1.4	3.6	13.4
Fructose	1.8	X	X	2.0	2.0
Galactose	X	1.2	1.2	1.4	1.5
Arabinose	X	0.8	0.8	1.0	1.2
Glucans^b	29.1	24.0	28.0	33.4	30.0
Cellulose	16.8	8.5	13.4	15.2	16.9
Arabinoxylan	8.1	8.1	6.5	7.6	7.2
Galactan	1.9	1.0	0.8	1.3	1.1
Galacturonic acid	4.3	3.7	4.2	4.1	3.1
Lignin	12.5	12.6	13.8	13.2	13.2
Protein	18.8	18.8	18.8	19.4	19.4
Ash	7.0	5.9	6.0	5.4	5.1

Samples were extracted with acetone. Water-soluble carbohydrates (WSC) and fructose were determined from the filtrates of the blended crop.
^aNon-structural carbohydrates expressed as total monosaccharides.
^bGlucans from non-cellulose parts.
X = < 0.5% of dry matter.

ISSN: 2731-3654