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| Improvement effects of corn steep liquor and other organic materials on alkaline soil and the change in humus characteristics |
| Received:March 15, 2021 |
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| KeyWord:corn steep liquor;saline-alkali soil;improvement effect;humus composition;humic acid structure |
| Author Name | Affiliation | E-mail | | DUAN Hongmei | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | DOU Sen | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | dousen1959@126.com | | WANG Dehui | Globalbiochem Technology Group Company Limited (GBT), Changchun 130062, China | | | ZHENG Shuang | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | LI Shuangyi | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | ZHANG Yifeng | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | BAI Yue | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | |
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| Abstract: |
| The present study evaluated effects of corn steep liquor(CSL) and its mixture with different organic materials on the improvement of saline-alkali soil and the change in humus characteristics. Saline soils from Songyuan City were used as the research object, and the following treatments were established:the control group(CK), 1/2 times the amount of corn steep liquor(1/2CSL), 1 times the amount of corn steep liquor(CSL), 2 times the amount of corn steep liquor(2CSL), 1/2 times the amount of corn steep liquor mixed with straw(1/2CSL+C), 1/2 times the amount of corn steep liquor mixed with biomass charcoal(1/2CSL+B), and 1/2 times the amount of corn steep liquor mixed with peat(1/2CSL+P). The improvement effect of saline-alkali soil and the changes in humus composition and humic acid(HA) structure characteristics were studied. Three replicates per treatment were used. The results showed that compared with CK, except for 2CSL, the yield of corn after each treatment increased by 66.67%~193.65%, and the pH, total salt content of each soil increased by 9.80%~11.09%, and 12.2%~44.3%, respectively, the alkalinity increased 12.67~26.53 percentage points. The organic carbon content of the 1/2CSL treatment increased by 46.19%, HA, and humin(HM) increased by 48.59% and 47.32%, respectively, I2920/I1720 increased by 156.3%, H/C increased by 25.96%, and(O+S)/C decreased by 30.68%. The high/medium heat release ratio decreased by 48.6%, and the high/medium weight loss ratio decreased by 14.2%. This shows that the application of organic materials enhances the aliphaticity of the soil HA structure, reduces the degree of oxidation, condensation, and thermal stability, and tends to produce a younger structure. In addition, the 1/2CSL treatment is found to be the most suitable. |
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