The impact of transition from flood to sprinkler irrigation on water district consumption

Nogues, J. P.; Herrero, J.

doi:10.1016/s0022-1694(03)00022-2

Cited by 20 publications

(6 citation statements)

References 16 publications

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“…However, it decreased sharply in 1994 due to EC restrictions obliged farmers not only to sow the fields but also to harvest the crop in order to receive the subsidies. As alfalfa, maize and rice are highly sensitive to fluctuations in water availability, they have a moderate association with the crop-specific or average suitable areas (Feijóo et al, 2000;Nogués and Herrero, 2003). This means that in years in which water shortages are expected, because of dry winters and low water storage in dams, those crops are not sown in lands that are suitable for them, thus reducing the degree of association between crops and land suitability.…”

Section: Resultsmentioning

confidence: 99%

“…These results indicate that these crops are usually located on the most suitable land for agriculture. However, frequent irrigation water shortages, due to limitations of either the reservoir's capacity or the delivery network during the peak season (Nogués and Herrero, 2003), explain the lack of a stronger association either with their crop suitable areas or the average suitable areas for the considered crops, since other crops (e.g. cereals and sunflower) are in fact sown in these areas.…”

Section: Resultsmentioning

confidence: 99%

“…Other minority crops (about <10% surface) are flax (Linum usitatissimum L.), forage, vetch (Vicia sativa L.), almonds (Prunus amygdalus Batsch) and olives (Olea europea L.). The district also includes some small non-irrigated land as well as about 3,300 ha that have been irrigated for more than six centuries by taking water from the abutting rivers using small diversion dams (Nogués and Herrero, 2003). The main irrigation method is flooding, although some fields are watered by sprinklers.…”

Section: Study Areamentioning

confidence: 99%

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Comparison between land suitability and actual crop distribution in an irrigation district of the Ebro valley (Spain)

Martínez‐Casasnovas¹,

Klaasse²,

Nogues³

et al. 2008

Span. j. agric. res.

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The present research aims to obtain a better insight into the agreement between land evaluation results and actual crop spatial distribution by comparing biophysical land suitability with different crop frequency parameters and with crop rotations derived from multi-year crop maps. The research was carried out in the Flumen district (33,000 ha), which is located in the Ebro Valley (northeast Spain). Land evaluation was based on a 1:100,000 soil survey according to the FAO framework for the main crops in the study area (alfalfa, winter cereals, maize, rice and sunflower). Three crop frequency maps and a crop rotation map, derived from a time-series of Landsat TM and ETM+ images of the period 1993-2000 were used for comparison with land suitability maps. The relationships between the two types of variables were analyzed by means of statistical tests (Pearson chi-square (χ 2 ), Cramer´s V, Gamma and Somers´ D). The results show the existence of a significant (P=0.001) relationship between crops' location and land suitability, except for opportunist crops as sunflower, which is very much influenced by subsidies in the study period. The alfalfa-based rotations show the highest distribution percentages (52%) on the land most suitable for agriculture in the area. The present multitemporal analysis approach offers a more realistic insight than the comparison between a land evaluation map and static year crop map in assessing the degree of agreement of land evaluation recommendations with crops actually cultivated by farmers.Additional key words: biophysical land suitability, crop rotation, land evaluation. ResumenComparación entre la aptitud de las tierras y distribución real de los cultivos en un distrito de riego del valle del Ebro (España)El objetivo de la presente investigación fue analizar la correspondencia entre los resultados de una evaluación de tierras con la distribución real de los cultivos. Para ello la aptitud biofísica de las tierras se comparó con diferentes tipologías de frecuencia de ocurrencia de los cultivos y rotaciones derivadas de mapas de cultivos multitemporales. La investigación fue llevada a cabo en el distrito de riego de Flumen (33.000 ha), localizado en el valle del Ebro (NE España). La evaluación de tierras se basó en una cartografía de suelos 1:100.000, según el esquema FAO, para los principales cultivos presentes en el área de estudio (alfalfa, cereales de invierno, maíz, arroz y girasol). Se utilizaron tres mapas de frecuencia de cultivos y un mapa de rotaciones, derivado de una serie temporal de imágenes Landsat TM y ETM+ del periodo 1993-2000, y se compararon con los mapas de aptitud de tierras para los diferentes cultivos. Se analizó estadísticamente (Pearson χ 2 , Cramer V, Gamma y Somers D) la relación entre los dos tipos de variables. Los resultados muestran la existencia de una relación significativa (P=0,001) entre la localización de los cultivos y la idoneidad de las tierras, excepto de cultivos oportunistas como el girasol, muy influenciado por las subvenciones en el p...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

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Comparison between land suitability and actual crop distribution in an irrigation district of the Ebro valley (Spain)

Martínez‐Casasnovas¹,

Klaasse²,

Nogues³

et al. 2008

Span. j. agric. res.

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“…The calcium carbonate content of the soils is always > 25%. Saline soils are common in several landform units (B1, B2, C2, C3, C4, and D), but saline-sodic soils occur only in spots at C3, C4, and D (Nogués et al, 2000;Nogués and Herrero, 2003).…”

Section: Study Areamentioning

confidence: 99%

Multivariate analysis of soil salination-desalination in a semi-arid irrigated district of Spain

2017

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Long-term studies of the changes in soil salinity are scarce and most overlook individual ions. Here, we assess changes in soil ionic contents using 42 soils repeatedly sampled during three campaigns over 24 years in a semi-arid irrigated district. Multivariate analysis (MVA) was used to evaluate the spatial distribution of ions and the temporal changes at comparable soil depths in relation to environmental and management factors. In general, the position of the soil in the landscape governed the spatial distribution of the salinity, while the temporal variations were related to irrigation, with incidences depending on the location in the district. Many soils on the slopes and foothills became salinated during the first years due to land leveling, but salination eventually tapered off after sprinkler utilization. At high and middle elevations, most soils were slightly saline in the first campaign but underwent desalination during the study period. At lower elevations, an initial desalination was followed by a pronounced salination, which was attributed to a water table rise with generalized irrigation in the basin. Whereas univariate salinity assessment might lead to conclusions that are over-simplistic at the landscape scale, MVA detects singular

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“…However, the soils in these new irrigated areas were in many cases not adequate for surface irrigation, because of their low available water holding capacity and high infiltration rates. This is often the case of platforms in the central Ebro Valley (Herrero and Snyder, 1997;Nogués et al, 2000;Nogués and Herrero, 2003). When these surface irrigated areas were designed and built, this irrigation technique was the only available in Spain.…”

Section: Cropping Patterns Yields and Productivitiesmentioning

confidence: 99%

Irrigation modernization and water conservation in Spain: The case of Riegos del Alto Aragón

Lecina¹,

Isidoro²,

Playán³

et al. 2010

Agricultural Water Management

173

100

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The impact of transition from flood to sprinkler irrigation on water district consumption

Cited by 20 publications

References 16 publications

Comparison between land suitability and actual crop distribution in an irrigation district of the Ebro valley (Spain)

Comparison between land suitability and actual crop distribution in an irrigation district of the Ebro valley (Spain)

Multivariate analysis of soil salination-desalination in a semi-arid irrigated district of Spain

Irrigation modernization and water conservation in Spain: The case of Riegos del Alto Aragón

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