version ISSN 0258-5936
Three experiments were conducted on carbonated loose Brown soils using Glomus intraradices strain, with the objective of establishing an adequate and feasible methodology for the mycorhizal inoculation of efficient AMF strains in cassava crop. Several methods and inoculant doses were compared, based on the overall seed recovery with different amounts of inoculants (22-174 kg.ha-1), localized seed tip recovery (11-14 kg.ha-1) and the traditional application of inoculants to the soil beneath the seeds (617 kg.ha-1), all of them performed at planting time. Inoculated treatments always received 25 % of NPK mineral fertilizer rate for cassava crop; they were also compared with other non-inoculated treatments receiving 0, 25 and 100 %. It was found that any application via recovery, even localized on seed tips, guaranteed a similar effective mycorhization to high doses of inoculants applied to the soil beneath the seeds. Inoculated treatments assured high and similar yields to those obtained when applying the recommended dose of mineral fertilizer for cassava crop (100 % NPK) of the order of 35 t.ha-1, it showing quite a superior mycorrhizal colonization percentage (60 %) to non-mycorhized treatments (<8 %). Mycorhizal inoculation via localized recovery on seed tips is recommended, due to its effectiveness and the low amounts of inoculants.ha-1 required.
Keywords : Manihot esculenta; arbuscular mycorhizae; NPK fertilization; inoculation.