| Effect of continuous application of biochar and organic fertilizers on saline\|alkali soil improvement |
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| DOI：10.7606/j.issn.1000-7601.2021.03.19 |
| Key Words: moderate saline-alkali soil biochar organic fertilizer soil improvement SAR ESP |
| Author Name | Affiliation | | WANG Shibin | School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255000, China | | GAO Peiling | School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255000, China
School of Resources and Environmental Engineering, Shandong University of Technology, Zibo, Shandong 255000, China | | ZHAO Yadong | School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255000, China | | XIANG Longkang | School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255000, China | | MENG Qingmei | School of Resources and Environmental Engineering, Shandong University of Technology, Zibo, Shandong 255000, China | | LIU Yue | School of Resources and Environmental Engineering, Shandong University of Technology, Zibo, Shandong 255000, China |
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| Abstract: |
| A contrast analysis of biochar and organic fertilizer on the improvement of saline\|alkali soil and the spatial\|temporal variation of basic ions in the Yellow River Delta was conducted under a field plot experiment with six treatments including CK （only fertilize with N 550 kg·hm-2·a-1,P2O5 120 kg·hm-2·a-1）, C1 (5 t·hm-2·a-1 biochar）, C2 （10 t·hm-2·a-1 biochar）, C3 （20 t·hm-2·a-1 biochar）, N1 （7.5 t·hm-2·a-1 organic fertilizer）, and N2 （10 t·hm-2·a-1 organic fertilizer）. The result showed: (1) The effect of biochar on soil moisture content improvement in 0~20 cm soil layer was better than the organic fertilizer, among them C3 increased the most while C2 was slightly less than C3, up to 17.98%. The soil moisture content of each treatment showed a decreasing trend in 20~40 cm soil layer, but the difference was not significant. The C2 treatment had the smallest variation range of soil moisture content and stable water held capacity. (2) Biochar was better than organic fertilizer in reducing soil salinity, reduced the soil salinity by 3.56% to 9.80%. The C2 treatment showed a significant decrease, up to 9.80% lower than CK did. (3) In the 0~40 cm soil layer, all treatments reduced Na content by 4.59% to 12.51% and sodium adsorption ratio (SAR) by 12.67% to 23.61%, exchangeable sodium percentage (ESP) by 16.05%~30.06%. (4) Biochar was better than organic fertilizer in inhibiting the toxicity of Na+. The C2 treatment was better, but it was less effective than organic fertilizer in increasing Ca2+ and Mg2+ contents, reducing SAR and ESP. (4) Biochar had better effect on the yield growth than organic fertilizer did. The yield increase rate of C2 was 20.97%. Biochar was superior to organic fertilizer in improving soil water holding capacity, increased crop yield and comprehensive improvement of saline alkali land, and C2 treatment had a best effect. So, it is recommended to add 10 t·hm-2·a-1 biochar to the saline-alkali soil in the Yellow River Delta for improvement. |
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