| Autor: |
Dey D; Department of Soil Science, Punjab Agricultural University, Ludhiana-141 004, Ludhiana, India. debomitadey26@gmail.com., Mavi MS; Department of Soil Science, Punjab Agricultural University, Ludhiana-141 004, Ludhiana, India. |
| Jazyk: |
angličtina |
| Zdroj: |
Environmental monitoring and assessment [Environ Monit Assess] 2021 May 05; Vol. 193 (6), pp. 326. Date of Electronic Publication: 2021 May 05. |
| DOI: |
10.1007/s10661-021-09107-w |
| Abstrakt: |
Overuse of nitrogenous fertilizers especially urea has been considered a significant source of reactive N causing acute environmental impacts through leaching, volatilization, and N 2 O gas emission from fertilized crop fields. However, some recent studies have proposed that such environmental losses of N can be ignored by adapting an alternative way of combining nitrogenous fertilizer with pyrolyzed biomass (biochar). Therefore, the effect of co-application of rice-residue biochar (RB) or poultry manure biochar (PB) along with urea on N dynamics was investigated by conducting a 60-day incubation experiment. The results showed that urea led to greater N mineralization (0.2 µg N g -1 soil day -1 ) due to the easy availability of ammonical-N (NH 4 + -N) produced from hydrolysis that acted as a substrate for nitrification. Sole application of biochars (RB or PB) or their co-application with urea resulted in 38-45% and 19-28% lower N mineralization than the sole urea amended soil, respectively. The lower N mineralization in sole biochar or biochar plus urea amended soil was most likely caused due to (1) increased C:N ratio of the biochar amended soil, (2) adsorption of NH 4 + -N by biochar, (3) microbial immobilization of the nitrogen in the amended soil, and (4) lower urease activity in the treatments amended with biochar. Thus, it may be concluded that the co-application of biochar with urea can reduce N losses through moderation of N mineralization and make it available to plants for longer periods. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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