- Chinese Core Journal
- Chinese Science Citation Database (CSCD) Source journal
- Journal of Citation Report of Chinese S&T Journals (Core Edition)
| Citation: |
CHEN Sijing, LI Fusheng, NONG Mengling. Effect of nitrogen fertigation management on soil nitrogen fractions and N2O emissions from ratoon sugarcane fields[J]. Journal of South China Agricultural University, 2023, 44(2): 230-238. DOI: 10.7671/j.issn.1001-411X.202112032
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To study the effects of drip irrigation nitrogen (N) chasing management on soil N fraction and N2O emission in host cane fields, and reveal the soil factors affecting soil N2O fluxes.
Two water drip irrigation levels of W0.8 (70%−80% of field water holding capacity) and W0.9 (80%−90% of field water holding capacity) and three drip irrigation N chasing ratios (250 kg·hm−2 of equal N) were carried out in a mobile rain-proof shelter with the second generation host cane (Saccharum officinarum) as the research object. N0 was all the N fertilizer applied to the soil (referred to as soil-applied N); N5 was 50% soil-applied N and 50% applied by drip irrigation system (referred to as drip-applied N); N7 was 30% soil-applied N and 70% drip-applied N in the field trials. Soil N2O flux, pH and nitrogen fraction content were measured at each period of sugarcane growth, and the relationship between soil N2O flux and soil pH/nitrogen fraction content was analyzed.
Soil N2O flux was higher after two days of applying N fertilizer and water irrigation, and the soil N2O flux of W0.9N5 was significantly lower than other treatments at the late tillering stage and maturity stage. Under W0.9, the cumulative soil N2O emissions in N5 at the late tillering stage were 47.3% and 11.8% lower than those of N0 and N7, and 21.5% lower than those of N7 at the late elongation stage. Soil nitrate N content showed W0.9 > W0.8 for the same drip irrigation N rate, and increased with the increase of water irrigation. At the early elongation and maturity stage, the soil ammonium N content of N5 under W0.8 was 56.4% and 71.8% higher than those of N0, was 68.5% and 160.3% higher than those of N7. At the late tillering stage, soil microbial biomass nitrogen showed N5 > N7 > N0 under the same water drip irrigation level, and soil microbial biomass nitrogen of N5 was 120.0% and 100% higher than N0 under both water irrigation rates, respectively. There was a positive correlation between soil N 2O flux and ammonium N content (r=0.313) and a negative correlation with nitrate N (r=−0.391).
W0.9N5 treatment can reduce soil N2O emissions, and soil ammonium N content and nitrate N content affect soil N2O flux, i.e., higher soil ammonium N content is associated with higher soil N2O flux, while higher soil nitrate N content is associated with lower soil N2O flux.
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