Effects of combined application of nitrification inhibitors and biochars on nitrogen transformation and nitrogen use efficiency in paddy soil
The effects of combined application of 3, 4-dimethylpyrazole phosphate (DMPP) and corn-stalk biochar on nitrogen transformation and nitrogen use efficiency in acid and neutral paddy soils were investigated by pot experiments. Four treatments were set up as follows: control (CK), DMPP, DMPP+300 ℃ bio...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2021-04-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2021.02.091 |
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| Summary: | The effects of combined application of 3, 4-dimethylpyrazole phosphate (DMPP) and corn-stalk biochar on nitrogen transformation and nitrogen use efficiency in acid and neutral paddy soils were investigated by pot experiments. Four treatments were set up as follows: control (CK), DMPP, DMPP+300 ℃ biochar (DMPP+300BC), DMPP+500 ℃ biochar (DMPP+500BC). The results showed that compared with the DMPP treatment, DMPP combined with 500 ℃ biochar significantly increased rice grain yield and nitrogen use efficiency in the neutral paddy soil by 8.5% and 10.6% (P＜0.05), respectively, but had no significant effect in the acid paddy soil. DMPP combined with biochar could effectively prolong the duration of nitrification inhibition. After 42 d of rice culture, the ammonium nitrogen (<inline-formula><alternatives><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M4"><mml:mi mathvariant="normal">N</mml:mi><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn mathvariant="normal">4</mml:mn></mml:mrow><mml:mrow><mml:mo>＋</mml:mo></mml:mrow></mml:msubsup></mml:math><inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/43C56AB2-4347-40ec-A968-18C889111740-M004.jpg"/></alternatives></inline-formula>-N) content in the two paddy soils was higher than that of the DMPP treatment. DMPP combined with biochar could effectively inhibit the transformation of <inline-formula><alternatives><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M5"><mml:mi mathvariant="normal">N</mml:mi><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn mathvariant="normal">4</mml:mn></mml:mrow><mml:mrow><mml:mo>＋</mml:mo></mml:mrow></mml:msubsup></mml:math><inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/43C56AB2-4347-40ec-A968-18C889111740-M005.jpg"/></alternatives></inline-formula>-N to nitrate nitrogen (<inline-formula><alternatives><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M6"><mml:mi mathvariant="normal">N</mml:mi><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn mathvariant="normal">3</mml:mn></mml:mrow><mml:mrow><mml:mo>－</mml:mo></mml:mrow></mml:msubsup></mml:math><inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/43C56AB2-4347-40ec-A968-18C889111740-M006.jpg"/></alternatives></inline-formula>-N), and the effect in the neutral paddy soil was better than that in the acid paddy soil, and the effect of 500 ℃ biochar was better than that of 300 ℃ biochar. After 21 d of rice culture, DMPP combined with 300 ℃ and 500 ℃ biochars reduced the denitrification activities of acid paddy soil by 45.4% and 80.9%, respectively, which were better than those of neutral paddy soil. Within 21 d of rice culture, DMPP combined with biochar had no significant effect on the abundance of ammonia oxidizing archaea (AOA) in the two paddy soils, but increased the abundance of ammonia oxidizing bacteria (AOB) in the acid paddy soil, while decreased the abundance of AOB in the neutral paddy soil, as compared with the DMPP treatment. In conclusion, DMPP combined with 500 ℃ biochar can inhibit nitrification by prolonging the duration of nitrification inhibition and reducing the abundance of AOB in the neutral paddy soil, thus improve rice grain yield and nitrogen use efficiency. |
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| ISSN: | 1008-9209 2097-5155 |