| Effects of nitrogen fertilizer combined with straw and bio\|char on soil organic nitrogen components in dryland farmland |
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| DOI：10.7606/j.issn.1000-7601.2020.01.13 |
| Key Words: straw biochar nitrogen dryland farmland soil acidolysis organic nitrogen Longzhong Loess Plateau |
| Author Name | Affiliation | | ZHANG Shihan | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WU Jun | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Renzhi | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Engineering Research Center for Agriculture Water\|saving, Lanzhou, Gansu 730070, China | | QI Peng | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Engineering Research Center for Agriculture Water\|saving, Lanzhou, Gansu 730070, China | | HE Yongyan | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | GUO Wanli | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to explore the effect of straw and biochar addition on the acidolysis organic nitrogen (N) components of dry farmland soil on Longzhong Loess Plateau under different N levels, an experiment of straw and biochar addition under different N levels (9 treatments in total) was conducted in Lijiabao, Anding District, Dingxi City in 2014. Bremner classification method was used to determine the soil organic N components after harvest in 2018. The results showed that in 0~30 cm soil layer (0~5, 5~10, and 10~30 cm), the contents of total organic N, ammoniac N, amino acid N and unknown N decreased with increase in soil depth, and the contents of amino sugar N increased with the soil depth; compared with the carbon free treatment (CN0, CN 50, and CN100), biochar was added (BN0, BN50, and BN100) treatments significantly increased the content of total organic N by 10.12%, 9.14% and 7.61% (from top to bottom), 15.02%, 16.25% and 17.19% (from top to bottom) and 13.31%, 11.84% and 8.74% (from top to bottom), respectively. Compared with the carbon free treatment (CN0, CN50, and CN100), straw addition treatment (SN0,SN50, and SN100) significantly increased the content of acid hydrolyzed amino sugar N by 26.46%, 26.51%, 25.78% (from the top to the bottom of the soil layer), respectively, of which SN100 treatment had the most significant effect; under different treatments, the distribution trend of various forms of organic N was acid hydrolyzed amino acid N > acid hydrolyzed ammonia N > acidolysis unknown N > acidolysis amino sugar N. In a word, BN100 treatment had the most significant effect on the increase of acid hydrolyzed amino acid N and acid hydrolyzed ammonia N, and then increased the potential of soil N supply. It can be selected as a reasonable fertilization method for spring wheat cultivation in this area. |
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