Effects of different types of humic acid isolated from coal on soil NH 3 volatilization and CO 2 emissions

Humic acid can improve soil nutrients and promote plant growth. Weathered coal and lignite can be used as agricultural resources due to high humic acid content, but their impact on soil NH volatilization and CO emissions are yet to be determined. In this study, a field experiment was carried out to...

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Bibliographic Details
Published in:Environmental research 2021-03, Vol.194, p.110711
Main Authors: Pang, Liuying, Song, Fupeng, Song, Xiliang, Guo, Xinsong, Lu, Yanyan, Chen, Shigeng, Zhu, Fujun, Zhang, Naidan, Zou, Jiacheng, Zhang, Penghui
Format: Article
Language:English
Subjects:
Agriculture
Ammonia - analysis
Carbon Dioxide - analysis
Coal
Fertilizers - analysis
Humic Substances
Nitrogen
Soil
Volatilization
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Summary:Humic acid can improve soil nutrients and promote plant growth. Weathered coal and lignite can be used as agricultural resources due to high humic acid content, but their impact on soil NH volatilization and CO emissions are yet to be determined. In this study, a field experiment was carried out to compare the effects of four types of humic acid isolated from coal (pulverized weathered coal (HC), pulverized lignite (HL), alkalized weathered coal (AC) and alkalized lignite (AL)) on NH volatilization, CO emissions, pH, the C/N ratio and enzyme activities in soil cultivated with maize. The effect of biotechnology humic acids (BHA) was also examined for comparison. HL, AC, AL and BHA all increased cumulative NH losses by 147.7, 278.5, 113.9, and 355.3%, respectively, compared with the control (chemical fertilizer only), and notably, BHA caused an increase of 90.71% compared with the humic acids isolated from coal. A significant increase in cumulative CO losses was observed only under AL treatment, by 14.44-24.90% compared with all other treatments. Soil urease activity was positively correlated with cumulative NH losses (P 
ISSN:1096-0953