Hongos micorrízicos arbusculares, Azotobacter chroococcum, Bacillus megatherium y FitoMas-E: una alternativa eficaz para la reducción del consumo de fertilizantes minerales en Psidium guajava, L. var. Enana Roja cubana

the experimental work was realized in the ubpc ？batalla de jobito？ located in ？el salvador？ municipality, guantánamo province during 2007-2009. research objective was define an alternative of nutritional management based on the use of arbuscular mycorrhizal fungi (amf), azotobacter chroococcum, bacillus megatherium and fitomas-e phytostimulant, as a viable way to reduce mineral fertilization in the crop of guava enana roja cubana unaffected yields. in order to establish the experiments we worked with the combination of 10 g.plant-1 of mycorrhizal (species: glomus intraradices) 2 l.ha-1 of azomeg [commercial product consisting of azotobacter chroococcum (2x1011 cfu x ml-1) and bacillus megatherium (3.2x1011 cfu x ml-1)] and 1 l.ha-1 of fitomas-e with the gradual reduction of mineral fertilizer of n and p; using 100, 75, 50 and 25 % respectively. outcome variable were measured: plant height, leaf pairs, number of brindillas, flowers and fruit, polar and equatorial diameter and mean fruit weight. moreover postharvest weight loss and yield were calculated. experimental results showed that the combination of 75 % of the mineral fertilizer, with biofertilizers and fitomas-e was superior to other treatments studied in all evaluated variables, this enabled the reduction of 25 % of mineral fertilization and better economic response.