LA EFECTIVIDAD DEL BIOFERTILIZANTE ECOMIC？ EN EL CULTIVO DE LA YUCA. RESULTADOS DE LAS CAMPA？AS DE EXTENSIONES CON PRODUCTORES

taking into account the positive and reproducible experimental results founded with the application of ecomic？, trough coating the vegetative seed tips of cassava with the arbuscular mycorrhizal fungal (amf) biofertilizer, at doses of 10 - 13 kg ha-1, two extensive field trials were conducted during 2007-2010 period, in order to test the feasibility of this application mode at a production scale. the trials were developed in 31 farms in guantánamo, cienfuegos, villa clara, matanzas and mayabeque provinces. an inoculated treatment and a control without inoculation were evaluated in surfaces of 0.5 to 1 ha, for all sites. the doses were independent of planting distances used. clones of cassava of different cycle, medium and large were used. cassava tips seeds were inoculated with g. cubense and g. intrarradices amf strains, depending of the soil type. in all cases, positive and significant responses were found on cassava yields, quantified around 33 % or 5t.ha-1 increment over the control. in 97 % of the trial yield increments were higher than 10% and in 70 % of the trials were higher than 25 %. the same positive response was found in both experimental years independently of soil type. the feasibility of cassava inoculation with this amf strains trough the recovering of tips seeds was demonstrated in this study.