Abstract

VAZQUEZ, Bannie; RIVERA, R; FERNANDEZ, Kalyanne  and  RODRIGUEZ, Yakelín. CARACTERIZACIÓN DEL COMPORTAMIENTO MICORRÍZICO EN Brachiaria decumbens INOCULADA CON Glomus hoi-like. cultrop [online]. 2010, vol.31, n.3, pp.00-00. ISSN 0258-5936.

The experiment was carried out at the National Institute of Agricultural Sciences (INCA), with the aim of characterizing the mycorhizal functioning of Brachiaria decumbens inoculated with Glomus hoi-like on a sterile Yellowish Ferralitic soil in two 15-m-long x 1-m-wide seedbeds at 20 cm high. To take samples, seedbeds were subdivided into three 5-m quadrants and samplings were performed at 30, 60, 90 and 120 days after seeding. Within those quadrants, plants were extracted from a 25-cm x 25-cm area to evaluate root and aerial dry weights in two depths (0-10 and 10-20 cm), as well as fungal colonization and visual density. Also, the number of AMF spores was determined by taking two samples made up of three and five sub-samples in each quadrant in both depths studied. No statistical differences were recorded in the mycorhizal colonization and visual density percentages between the two depths, both variables increased in time and the highest mycorhizal colonization values were observed at 90 days. Spore production started to increase with time and there were not any significant differences between taking three and five sub-samples per compound sample at 30 and 60 days; however, at 90 and 120 days, there were statistical differences, since the sample composed by five sub-samples showed the highest spore numbers in both cases. The spore number was significantly correlated with mycorhizal colonization; nevertheless, these two variables were not correlated with root dry weight.

Keywords : Brachiaria decumbens; sampling depths; Glomus hoi-like.

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