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Agricultural behaviour of two cardoon varieties at different planting dates in Navarra

Macua, J.I., Lahoz, L., Malumbres, A., Garnica, J., Urmeneta, I., Arrondo, A.
Acta horticulturae 2004 no.660 pp. 253-255
cardoons, finishes, frozen foods, harvesting, industry, planting date, Spain
Cardoon is a typical crop in the Mediterranean zone. The principal production area in Spain is the Ebro Valley, and predominantly Navarra with the variety "Verde de Peralta". The principal use is for industry (preserved and frozen foods). The traditional cultivation period starts planting on July and finishes harvesting in December; however, an expansion of the harvest for its commercial transformation has implied the need to enlarge the production period. Thus, the production and characteristics of the varieties "Verde de Peralta" and "Tafalla" in the 2002-2003 season were analysed in four planting dates since the end of June to the first half of August. The major vegetative progress was obtained in the first planting date becoming smaller in the following ones. This feature was correlated with production which was lesser in the late planting dates, due to a decrease of average cardoon plant weights and not to a lesser number of commercial plants. In every planting date it was confirmed that the largest vegetative potential of "Verde de Peralta" in contrast to that of "Tafalla" that have higher average plant weight. Differences in commercial quality between planting dates were not detected.