Effects of Organic Material Types on Temporal Changes in Characteristics of Humic Acids Extracted from a Chernozem

Shiji Chen, Xinhua Yin, Shuai Wang and Jinggui Wu
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Shiji Chen: College of Resource and Environmental Science, Jilin Agricultural University, Changchun 130118, China
Xinhua Yin: Department of Plant Sciences, The University of Tennessee, Jackson, TN 38301-3201, USA
Shuai Wang: College of Agriculture, Jilin Agricultural Science and Technology University, Jilin 132101, China
Jinggui Wu: College of Resource and Environmental Science, Jilin Agricultural University, Changchun 130118, China

Sustainability, 2019, vol. 11, issue 20, 1-11

Abstract: Returning organic materials to fields is an effective management practice for improving soil quality in agroecosystems. In the case of scarce organic material resources, choosing the optimal material type for improving the quality of a soil type is an urgent problem to be solved. The objective of this study was to evaluate the temporal variations in the spectroscopic characterization of humic acids (HAs) over a period of 90 days after applying biotechnologically extracted fulvic acid (BFA), well-decomposed sheep manure (M), corn stover pellets (Ps) and corn stover powder (Pr) at equal C amount to a chernozem under laboratory conditions, measured by Fourier transform infrared (FTIR) spectroscopy and ultraviolet-visible spectrophotometry (UV–Vis). The results indicated that the BFA and Pr with higher C contents (68.9 and 59.8 g kg −1 , respectively) were more beneficial to the C mineralization of HAs. M, applied in the largest amount, together with the highest available N, P, and K contents (575.4, 160.1, 478.9 mg kg −1 , respectively), and its more easily consumed carbohydrates as well as well-decomposed status, was more likely to promote the condensation of HAs. BFA carried more hydrophilic groups into the HAs, while Ps did not introduce high levels of adsorbed H 2 O molecules and aromatic C=C (or C=O) groups. Ps did not affect the molecular structure of HAs after incorporation into the chernozem. At the equal C input amount, M had the greatest benefit, whereas the beneficial effect of Ps was the least, in improving the chernozem quality.

Keywords: chernozem; organic material; humic acid; FTIR spectroscopy; E 4 /E 6 ratio (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
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