| Simulation of water and nitrogen transport processes in cotton fields under mulch drip irrigation with reduced nitrogen application |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2026.02.07 |
| Key Words: cotton field nitrogen reduction drip irrigation under mulch water\|nitrogen migration simulation |
| Author Name | Affiliation | | YU Zhiruo | College of Water Conservancy ＆ Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003, China | | DING Ping | Xinjiang Institute of Water Resources and Hydropower Research, Urumqi, Xinjiang 830049, China | | WU Chentao | Pucheng Plant Protection and Quarantine Station, Weinan, Shaanxi 715500, China | | WANG Chunxia | College of Water Conservancy ＆ Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003, China |
|
| Hits: 427 |
| Download times: 35 |
| Abstract: |
| Through a drip irrigation micro\|plot experiment with four nitrogen application rates: normal nitrogen (100%N), 10% reduction (90%N), 20% reduction (80%N), and 30% reduction (70%N), this study monitored soil moisture and NO-3-N levels at key locations: below the dripper (irrigation core zone), below the cotton row (root\|dense zone), and below the wide row (root\|sparse zone). The HYDRUS-2D model was used to analyze the transport processes of water and nitrogen under reduced nitrogen drip irrigation in cotton fields. The results showed that the HYDRUS-2D model effectively simulated soil moisture and NO-3-N dynamics, with coefficients of determination R2 of water ranging from 0.31 to 0.98, and R2 of nitrogen ranging from 0.44 to 0.99, relative error of the mean absolute error (REMAE) varying between 6.00% and 20.00%, and relative root mean square error (RERMSE) varying between 6.50% and 23.33%. The simulation revealed significant spatial heterogeneity in soil moisture under drip irrigation: sufficient water replenishment occurred in the dripper zone, soil moisture in the cotton row zone was strongly influenced by root water uptake, and the wide row zone experienced persistent water deficit. Soil NO-3-N was primarily accumulated in the 0-30 cm soil layer, with peak concentrations following the spatial pattern: below the dripper (63.00 mg·kg-1) < below the wide row (68.42 mg·kg-1) < below the cotton row (63.4 mg·kg-1). The peak NO-3-N values in each zone decreased gradiently as nitrogen reduction increased. Both measured and simulated values of soil NO-3-N indicated that the 20% nitrogen reduction treatment achieved the best nitrogen regulation effect, reducing NO-3-N by 20.2%-22.7% compared to normal nitrogen application. This effectively minimized leaching without negatively affecting cotton growth. |
|
|
|