Water-extractable organic matter and its fluorescence fractions in response to minimum tillage and organic farming in a Cambisol

Chemical and Biological Technologies in Agriculture

Table 3 Correlations between PARAFAC components of WEOM and soil characteristics for all treatments at varying soil depths (n = 12)

	SOC	Total N	WEOC	WEON	Clay
0–8 cm
C1	0.82^b	0.74^b	NS	NS	−0.72^b
C2	0.69^a	0.64^a	0.60^a	NS	−0.86^b
C3	0.81^b	0.73^b	NS	NS	−0.74^b
12–25 cm
C1	0.94^b	0.94^b	0.85^b	0.61^a	0.68^a
C2	0.94^b	0.91^b	0.95^b	NS	0.93^b
C3	0.95^b	0.95^b	0.84^b	0.60^a	0.68^a

SOC soil organic carbon, WEOC water-extractable organic carbon, WEON water-extractable organic nitrogen, C1, C2, C3 EEM-PARAFAC components with C1 and C3 are humic-like substance and C2 is tryptophan-like substance, NO ₃ –N nitrate, NH ₄ –N ammonium
^aCorrelation is significant at the 0.05 level (2-tailed)
^bCorrelation is significant at the 0.01 level (2-tailed)