The effect on greenhouse potted Dieffenbachia maculata 'Camille' growing on 80% unfertilised blond peat (pH 6.0) and 20% perlite (v/v) of different fertilization methods has been studied. The fertilization treatments were: F (control) -Standard fertigation (9,7 meq N L -1 ; 10% NH 4 + -N; 1,4 meq P L -1 ; 4,3 meq K L -1 ); CF-30% of total N applied as soluble complex 17-8-14 (11,1% NH 4 + -N and stabilized with DMPP) and 70% of total N like F; BF -Basacote Plus (16-8-12; 3,0 g L -1 ) + 50 % of total N equal to F; C-70% of total N as soluble complex 17-8-14 (11,1% NH 4 + -N stabilized with DMPP). The experimental design was unifactorial with 29 pots per treatment. During the experiment nitrogen concentrations (nitrate and ammonium) in the leached solution were analysed; finally, height, leaf area, dry matter content and total concentration of nitrogen, phosphorous and potassium were determined. The fertilization method had a significant effect on the crop vegetative and bioproductive parameters, showing the treatments with complex fertilizers (CF and C) highest values of leaf area, plant height and dry matter production. Plant N concentrations were lower in treatments CF and BF than in control treatment. Treatment C had similar results than those of F; however, and due to higher biomass production, treatment C showed higher N extraction index and uptake efficiency. The control treatment (F) showed the highest rates of N lixiviation losses, the slow release fertilizer treatment (BF) the lowest. Complex and slow release treatments showed low rates of ammonium lixiviation losses.

El objetivo de este estudio fue evaluar el efecto de los bioproductos DIMABAC y FitoMas E en el cultivo del tomate en las condiciones de suelo ferralítico rojo típico (Oxisol). La investigación se realizó en el Instituto de Investigaciones Hortícolas ¨Liliana Dimitrova¨ (IIHLD), Cuba, durante dos campañas (2009 – 2010 y 2010 - 2011). Se estudiaron siete tratamientos que consistieron en la combinación de DIMABAC y FitoMas E con dos niveles de fertilización nitrogenada recomendada para el cultivo del tomate, los cuales se distribuyeron en un diseño de bloques al azar con tres réplicas, donde se evaluaron indicadores de desarrollo vegetativo, morfológicos y productivos. Los mejores resultados en cuanto a crecimiento y producción correspondió al tratamiento inoculado con DIMABAC y el bioestimulante FitoMas E más el 70% del nitrógeno, lo cual permite reducir en un 30% la fertilización nitrogenada, constituyéndose en una alternativa de manejo de la nutrición mineral del cultivo del tomate.

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