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Chemical and Biological Technologies in Agriculture
Fig. 4 | Chemical and Biological Technologies in Agriculture

Fig. 4

From: Molecular characteristics of humic substances from different origins and their effects on growth and metabolism of Pinus laricio callus

Fig. 4

Biplot diagram generated by principal component analysis of the 13C-CPMAS–NMR spectra of the different humic materials. HA-C from Leonardite; HA-D from oak forest soil; HA-E from compost after 150 d maturation; HA-F from treated Lignite; HA-G from compost after 30 d maturation; HA-H from an oxidized coal; HA-I from fir and beech forest soil; HA-L from peat; HA-M from vermicompost; HA-N from a Lignite; FA-O from a loamy agricultural soil; FA-P a sandy loam agricultural soil; FA-Q from a volcanic forest soil

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