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| DC Field | Value | Language |
|---|---|---|
| dc.creator | Cavero Campo, José | - |
| dc.creator | Beltrán, Ángel | - |
| dc.creator | Aragüés Lafarga, Ramón | - |
| dc.date | 2008-06-04T09:59:39Z | - |
| dc.date | 2008-06-04T09:59:39Z | - |
| dc.date | 2003 | - |
| dc.date.accessioned | 2017-01-31T01:33:54Z | - |
| dc.date.available | 2017-01-31T01:33:54Z | - |
| dc.identifier | Journal of Environmental Quality 32:916-926 (2003) | - |
| dc.identifier | 0047-2425 | - |
| dc.identifier | http://hdl.handle.net/10261/4793 | - |
| dc.identifier.uri | http://dspace.mediu.edu.my:8181/xmlui/handle/10261/4793 | - |
| dc.description | Nitrate contamination of surface waters has been linked to irrigated agriculture across the world. We determined the NO3–N loads in the drainage waters of two sprinkler-irrigated watersheds located in the Ebro River basin (Spain) and their relationship to irrigation and N management. Crop water requirements, irrigation, N fertilization, and the volume and NO3–N concentration of drainage waters were measured or estimated during two-year (Watershed A; 494 irrigated ha) and one-year (Watershed B; 470 irrigated ha) study periods. Maize (Zea mays L.) and alfalfa (Medicago sativa L.) were grown in 40 to 60% and 15 to 33% of the irrigated areas, respectively. The seasonal irrigation performance index (IPI) ranged from 92 to 100%, indicating high-quality management of irrigation. However, the IPI varied among fields and overirrigation occurred in 17 to 44% of the area. Soil and maize stalk nitrate contents measured at harvest indicated that N fertilizer rates could be decreased. Drainage flows were 68 mm yr-1 in Watershed A and 194 mm yr-1 in Watershed B. Drainage NO3–N concentrations were independent of drainage flows and similar in the irrigated and nonirrigated periods (average: 23–29 mg L-1). Drainage flows determined the exported mass of NO3–N, which varied from 18 (Watershed A) to 49 (Watershed B) kg ha-1 yr-1, representing 8 (Watershed A) and 22% (Watershed B) of the applied fertilizer plus manure N. High-quality irrigation management coupled to the split application of N through the sprinkler systems allowed a reasonable compromise between profitability and reduced N pollution in irrigation return flows. | - |
| dc.description | This research was supported by the government of Aragón (DGA, Spain). | - |
| dc.description | Peer reviewed | - |
| dc.format | 17906 bytes | - |
| dc.format | application/pdf | - |
| dc.language | eng | - |
| dc.publisher | American Society of Agronomy | - |
| dc.publisher | Crop Science Society of America | - |
| dc.publisher | Soil Science Society of America | - |
| dc.relation | Technical reports - Landscape and Watershed Processes | - |
| dc.rights | closedAccess | - |
| dc.title | Nitrate Exported in Drainage Waters of Two Sprinkler-Irrigated Watersheds | - |
| dc.type | Artículo | - |
| Appears in Collections: | Digital Csic | |
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