Filter Cake and Vinasse as Fertilizers Contributing to Conservation Agriculture

Table 2

Concentrations of organic matter (OM) and mineral elements, pH values, and C/N ratios determined in filter cake calculated on dry weight basis. Data are taken from reports of different authors for contrasting pedoclimatic conditions.

Determinations	Filter cake
	(*)	[10]	[12]	[36]	Average
OM (%)	29.6	15	—	—	22.3
pH	8.2	—	7.1	—	7.7
N (%)	1.4	4.8	1.6	0.3	2.0
P (%)	1.2	1.8	1.3	0.1	1.1
K (%)	0.2	0.3	0.4	0.4	0.3
Ca (%)	2.7	1.6	2.5	1.7	2.1
Mg (%)	1.1	0.4	—	0.2	0.6
S (%)	0.2	0.3	—	—	0.25
C/N ratio	12	—	25	36	24

*: Data of the authors. —: Not determined.