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Las Palmas de Gran Canaria, Spain

Leite K.N.,Travessa Dom Jose Lourenco | Cabello M.J.,CA El Chaparrillo | Valnir Junior M.,Instituto Federal Tecnologico do Ceara IFCE | Tarjuelo J.M.,University of Castilla - La Mancha | Dominguez A.,University of Castilla - La Mancha
Journal of the Science of Food and Agriculture | Year: 2015

BACKGROUND: In water scarcity areas the use of saline water for irrigation is a common practice. In this study, experimental data from two two-year melon tests were collected for the calibration (2004 'Yellow Melon' (YeMe) type) and validation (2002 YeMe, 2005 and 2006 'Piel de Sapo' (PiSa) type) processes in melon crop simulation under deficit irrigation conditions using salt water. The simulations were carried out for Castilla-La Mancha (Spain) and Ceará (Brazil) using the MOPECO model, which includes optimized regulated deficit irrigation (ORDI) methodology. The objective was to determine the most suitable irrigation strategy for both areas. RESULTS: Under fresh water conditions, ORDI may increase yield by up to 20% (PiSa) and 7% (YeMe) compared with constant deficit irrigation. Higher water deficit should be induced during the vegetative development and ripening stages. The rainfall between irrigation periods is able to leach the salts supplied by the irrigation water. CONCLUSION: The combination of ORDI with different strategies for managing saline water may increase water use efficiency. In these areas it may be of interest not to apply the leaching fraction (saving up to 67% of irrigation water). However, leaching of the soluble salts accumulated before starting the most sensitive periods may be suitable. © 2014 Society of Chemical Industry.

Nico A.I.,CA El Chaparrillo | Nico A.I.,National University of La Plata | Sanchez M.G.,Agricultural Cooperative Virgen del Monte COOVIMAG
European Journal of Plant Pathology | Year: 2012

Incidence and severity of Pink root caused by Phoma terrestris and Fusarium basal rot caused by Fusarium oxysporum f. sp. cepae were field-tested on factorial combinations of different soil fumigation treatments in five different intermediate-day onion hybrids widely adapted at the Bolaños de Calatrava area (Ciudad Real, Spain). The effect of Dazomet and virulence of the local isolates were then tested in trays under greenhouse conditions. When compared to Electric, the other four onion hybrids showed a certain degree of tolerance to Pink root and Fusarium basal rot with little difference among them. The field trial carried out in 2006 showed significant but negligible beneficial effects in medium bulb weight and Pink root severity due to Dazomet. The field trial carried out in 2007 showed significant beneficial effects of Metham-sodium on plant growth and Pink root and Fusarium basal rot severities. Sodium tetrathiocarbonate performed worse than the control. Greenhouse test showed that Dazomet performed nearly as well as sterilization under controlled conditions. Virulence of local isolates was lower than that of reference isolates. © 2012 KNPV.

Memmi H.,CA El Chaparrillo | Gijon M.C.,CA El Chaparrillo | Guerrero J.,OMNIApistachoe | Couceiro J.F.,CA El Chaparrillo | Perez-Lopez D.,Technical University of Madrid
Acta Horticulturae | Year: 2014

Regulated deficit irrigation (RDI) is a technique based on: reducing the water supply in growth stages of tree/fruit when a controlled water stress does not, or does not significantly, affect yield or fruit quality, to cover crop evaporative demand during the rest of the year and to have knowledge of the critical periods for the application of RDI. For this purpose, pistachio fruits ('Kerman' grafted on Pistacia terebinthus) development was studied during an "ON" load year (2010) to characterize the evolution of fruit growth and to identify clearly each growth stage for the aim of having a more efficient application of RDI. Shell diameter, fresh fruits weight, kernel weight and shell hardness were measured during the experiment. The study took place in a 12-year-old pistachio (Pistacia vera L. 'Kerman' on Pistacia terebinthus L. rootstock) orchard at the "El Chaparrillo" Research Station, Ciudad Real, Spain (3°56'W, 39°0'N; altitude 640 m). Three irrigation regimes were applied; a control and two treatments with different levels and moments of water stress (T1, T2). The fruit growth pattern has been characterized by a continuous shell lignification throughout the period of fruit growth. The lack of irrigation supply during stage I and II has shown better results in fruit diameter than a lower input distributed between stage I and III.

Perez-Lopez D.,Technical University of Madrid | Moriana A.,University of Seville | Martinez E.,CA El Chaparrillo | Guerrero J.,Omnia Pistacho
Acta Horticulturae | Year: 2014

This study is based on the comparison of production data, in terms of crop quality, of eight female pistachio cultivars: 'Aegina', 'Ashoury', 'Avdat', 'Avidon' 'Kerman', 'Larnaka', 'Mateur' and 'Napoletana' on native rootstock P. terebinthus L. The experiment was conducted at the El Chaparrillo Research Station, Ciudad Real, Spain (3°56'W, 39°0'N; altitude 640 m). Data have been collected during four years, and tree age was between 11 and 14 years. It has been studied the influence of climatic factors on the reproductive physiology of the crop in the aspects related to the commercial quality of the yield: percentage of dehiscent and blank fruits. However, other factors are probably interrelated to understand all these relationships. A close relationship with temperatures has been shown. Heat units above 30°C. (UC30) during the growing season (from May to September) had the best significances with the percentage of split fruits. High temperatures during the vegetative growth of the tree increase the percentage of split fruits, with maximum temperatures in June being those of major influence. Moreover, the percentage of blank fruits showed better relationship with the temperatures of April, when flowering and pollination occurs; generally it is observed that the minimum temperatures of this month affect the final percentage of blank fruits.

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