| 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 |
|