Intercropping of tomato with antagonistic plants in the treatment of soil infested with Meloidogyne spp., under greenhouse

El intercultivo de tomate con especies antagónicas se considera una alternativa de manejo de Meloidogyne spp. El objetivo del trabajo fue evaluar el intercultivo de las especies Tagetes erecta, Tagetes minuta y Crotalaria juncea para el manejo de Meloidogyne spp., en el cultivo de tomate. Se determinó, en las plantas de tomate, el índice de agallas y el número y peso de frutos. El intercultivo de tomate con T. erecta mostro un menor índice de agallas que el resto de los tratamientos evaluados. Además, se observó en este tratamiento, y en el de T. minuta, un mayor peso y número de frutos con respecto al tratamiento con C. juncea y al testigo sin intercultivo. En las condiciones de este ensayo, el intercultivo de tomate con T. erecta mostró ser una buena alternativa de manejo de Meloidoigyne spp. Se contribuye con esta práctica a una menor utilización de fitosanitarios, con el efecto positivo que trae aparejado para con el medio ambiente, y a la obtención de un producto hortícola de mayor inocuidad para el consumo.Tomato intercropping with antagonistic species is considered a management alternative for Meloidogyne spp. The objective of the work was to evaluate the intercropping of Tagetes erecta, Tagetes minuta and Crotalaria juncea for the management of Meloidogyne spp., in tomato cultivation. The gall index and the number and weight of fruits were determined in tomato plants. Tomato intercropping with T. erecta showed a lower gall index than the rest of evaluated treatments. In addition, a higher weight and number of fruits were observed in this treatment and in the one with T. minuta, respect to the C. juncea treatment and the control without intercropping. Under the conditions of this trial, intercropping of tomato with T. erecta proved to be a good alternative for the management of Meloidoigyne spp. This practice contributes to a lesser use of phytosanitary products, with the positive effect that it has on the environment, and to the obtaining of a more innocuous horticultural product for human consumption.Fil: Comezaña, María Micaela. Universidad Nacional del Sur. Departamento de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; ArgentinaFil: Rodríguez, R. A.. Universidad Nacional del Sur. Departamento de Agronomía; ArgentinaFil: Ayastuy, M. E.. Universidad Nacional del Sur. Departamento de Agronomía; ArgentinaFil: Muscolino, C.. Universidad Nacional del Sur. Departamento de Agronomía; ArgentinaFil: Rosetti, F.. Universidad Nacional del Sur. Departamento de Agronomía; ArgentinaFil: Belladonna, D. P.. Universidad Nacional del Sur. Departamento de Agronomía; Argentin

Comparative study of CuO-CeO2 catalysts prepared by wet impregnation and deposition-precipitation

Two different preparation methods are used to synthesize wt. 7% CuO–CeO2 catalysts: a conventional wet impregnation method, and a deposition–precipitation (DP) method using Na2CO3 as precipitating agent. Both samples are characterized by a series of techniques. CuO–CeO2 (Cu–Ce) prepared by DP shows a lower capacity to release the lattice oxygen to form CO2. From CO-TPR results, it is demonstrated that this catalyst is not able to reduce copper clusters at low temperatures. Also, CO-TPD shows no CO2 formation. The activity results confirm the worse performance of Cu–Ce prepared by DP especially when oxygen is not in excess (PROX reaction with stoichometric oxygen). A copper particle size which is too small could create a stronger metal-support interaction, with lower Cu–Ce interface to react.Authors want to thank Spanish MEC for the economic support (Project ENE2004-06861). A.G. wants to thank Spanish MEC for the support with a FPU fellowship

The effect of different organic fertilization on garlic (Allium sativum L.) in Bahía Blanca region, Argentina

The work was carried out during the years 2007 and 2008, in a sandy soil located in the experimental field of the Agronomy Department, Universidad Nacional del Sur. The objectives of the work were to study the effect of three organic fertilizations on garlic production and to determine the macronutrient content in leaves during the crop cycle. The experiment was carried out in a completely randomized design with four replicates. The treatments were: T0, with inorganic fertilization (100 kg ha-1 of diamonic phosphate + 100 kg ha-1 of urea); T1, 16.07 kg ha-1 of bovine manure-Onion compost (+ 50 kg ha-1 of phosphate rock); T2, 2000 kg ha-1 of BioOrganutsa Nitro Plus a commercial organic fertilizer, (+ 50 kg ha-1 of phosphate rock); and T3, BioOrganutsa Nitro Plus + vermicompost tea (same as T2 + 1,25 L vermicompost tea). During both years, the number of leaves, height and dry weight along the cycle increased in all treatments. T2 and T3 showed the highest values compared to T1. Nitrogen and potassium content in leaves decreased gradually in all treatments after the beginning of bulb formation. At harvest, T2 and T3 presented the highest yield, weight and diameter bulbs in 2008, while T1 obtained the lowest values of these parameters. In 2007 T3 showed significant differences compared to T1 as regards the 3 parameters. The commercial organic fertilizer BioOrganutsa Nitro Plus + phosphate rock, incorporated alone or in combination with vermicompost tea, can be an alternative to fertilize organic garlic crop. It will be necessary to try different doses of the compost to evaluate its value as an organic fertilizer.Fil: Rodríguez, Roberto Adrián. Universidad Nacional del Sur. Departamento de Agronomía; ArgentinaFil: Miglierina, Ana María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Agronomía; ArgentinaFil: Ayastuy, M. E.. Universidad Nacional del Sur. Departamento de Agronomía; ArgentinaFil: Lobartini, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Agronomía; ArgentinaFil: Van Konijnenburg, A.. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Dagna, N.. Universidad Nacional del Sur. Departamento de Agronomía; ArgentinaFil: Greco, N.. Universidad Nacional del Sur. Departamento de Agronomía; ArgentinaFil: Egea, C.. Universidad Politécnica de Cartagena; EspañaFil: Fernández, J. A.. Universidad Politécnica de Cartagena; Españ