Evaluation of a crop rotation with biological inhibition potential to avoid N 2 O emissions in comparison with synthetic nitrification inhibition

Agriculture has increased the release of reactive nitrogen to the environment due to crops' low nitrogen-use efficiency (NUE) after the application of nitrogen-fertilisers. Practices like the use of stabilized-fertilisers with nitrification inhibitors such as DMPP (3,4-dimethylpyrazole phosphat...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2023-05, Vol.127, p.222
Main Authors: Bozal-Leorri, Adrián, Corrochano-Monsalve, Mario, Arregui, Luis M, Aparicio-Tejo, Pedro M, González-Murua, Carmen
Format: Article
Language:English
Subjects:
Agriculture
Crop Production
Crops, Agricultural
Dimethylphenylpiperazinium Iodide - pharmacology
Fertilizers
Nitrification
Nitrogen - pharmacology
Nitrous Oxide
Soil - chemistry
Triticum
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Summary:Agriculture has increased the release of reactive nitrogen to the environment due to crops' low nitrogen-use efficiency (NUE) after the application of nitrogen-fertilisers. Practices like the use of stabilized-fertilisers with nitrification inhibitors such as DMPP (3,4-dimethylpyrazole phosphate) have been adopted to reduce nitrogen losses. Otherwise, cover crops can be used in crop-rotation-strategies to reduce soil nitrogen pollution and benefit the following culture. Sorghum (Sorghum bicolor) could be a good candidate as it is drought tolerant and its culture can reduce nitrogen losses derived from nitrification because it exudates biological nitrification inhibitors (BNIs). This work aimed to evaluate the effect of fallow-wheat and sorghum cover crop-wheat rotations on N O emissions and the grain yield of winter wheat crop. In addition, the suitability of DMPP addition was also analyzed. The use of sorghum as a cover crop might not be a suitable option to mitigate nitrogen losses in the subsequent crop. Although sorghum-wheat rotation was able to reduce 22% the abundance of amoA, it presented an increment of 77% in cumulative N O emissions compared to fallow-wheat rotation, which was probably related to a greater abundance of heterotrophic-denitrification genes. On the other hand, the application of DMPP avoided the growth of ammonia-oxidizing bacteria and maintained the N O emissions at the levels of unfertilized-soils in both rotations. As a conclusion, the use of DMPP would be recommendable regardless of the rotation since it maintains NH in the soil for longer and mitigates the impact of the crop residues on nitrogen soil dynamics.
ISSN:1001-0742