DOI: 10.1016/j.crm.2014.06.001
Scopus记录号: 2-s2.0-84906724897
论文题名: Tailoring wheat management to ENSO phases for increased wheat production in Paraguay
作者: Ramirez-Rodrigues M.A. ; Asseng S. ; Fraisse C. ; Stefanova L. ; Eisenkolbi A.
刊名: Climate Risk Management
ISSN: 22120963
出版年: 2014
卷: 3 起始页码: 24
结束页码: 38
语种: 英语
英文关键词: APSIM-Nwheat
; Climate variability
; ENSO-persistence-based forecast
; GCM-based forecast
; Paraguay
; Wheat modeling
英文摘要: Reported regional wheat yields in Paraguay vary from 1 to 3. t/ha from year to year, but appear not to be correlated with El Niño-Southern Oscillation (ENSO) phases. Historical weather data from two locations in representative wheat-growing regions of Paraguay, Encarnación-Itapúa and Ciudad del Este-Alto Paraná combined with crop modeling, were analyzed to optimize nitrogen (N) fertilizer application rates according to the ENSO phase of a growing season. The ENSO phase of a growing season was defined based on the average of the sea surface temperature (SST) anomalies in the Eastern Equatorial Pacific region for the period June-October using the El Niño region 3.0 index (Niño 3.0). Simulated average yields in Alto Paraná were higher in the drier and cooler La Niña wheat-growing seasons (average of 3.5. t/ha) compared to the other phases (average of 3.2. t/ha) and in Itapúa, in Neutral seasons (average of 3.8. t/ha) compared to the other phases (average of 3.7. t/ha). Accordingly, optimal N fertilizer applications ranged between 20 and 60. kg. N/ha between phases depending on the sowing date, soil type and initial amount of soil water content. Applying an ENSO or General Circulation Model (GCM)-based forecast for ENSO-season-type specific N fertilizer applications resulted in benefits of >100 US$/ha when compared with current farmers' practice of consistently low N fertilizer applications in Paraguay. When N management based on forecasts was compared with optimized N application without forecast, the benefits of the forecast was only up to 8 US$/ha. The ENSO-persistence-based forecast showed higher values than the GCM-based forecasts with two lead-times but lower skill. Using climate information can significantly increase current wheat yields and gross margins in Paraguay by tailoring N fertilizer applications to the Niño 3.0-defined ENSO phases, which can be forecasted with moderate skill at the beginning of the growing season. © 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59070
Appears in Collections: 气候变化与战略
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作者单位: University of Florida, Department of Agricultural and Biological Engineering, Gainesville, FL, United States; Florida State University, Center for Ocean-Atmospheric Prediction Studies, Tallahassee, FL, United States; Universidad Nacional de Itapúa, Departamento de Agronomía, Itapúa, Paraguay
Recommended Citation:
Ramirez-Rodrigues M.A.,Asseng S.,Fraisse C.,et al. Tailoring wheat management to ENSO phases for increased wheat production in Paraguay[J]. Climate Risk Management,2014-01-01,3