Abstract

PENTON, Gertrudis et al. Effect of the mycorrhizal symbiosis, chemical fertilization and their combination, on the soil-plant relation of mulberry. Pastos y Forrajes [online]. 2014, vol.37, n.4, pp. 399-407. ISSN 0864-0394.

The effect of the inoculation with arbuscular mycorhizal fungi (AMF) strain Glomus cubense through Canavalia ensiformis, chemical fertilization and their combination, on the root functioning, mycorrhizal symbiosis and the nitrogen extraction capacity in mulberry (Morus alba L.), was evaluated. The fertilizer doses were: 1) control without fertilization (F0); 2) 100-50-50 kg of N, P and K ha^-1 per season (F1); and 3) 200-100-100 kg of N, P and K ha^-1 per season (F2). The alternatives to inoculate AMF consisted in: control without AMF, direct application to the soil, and inoculation through intercropped C. ensiformis. The root biomass of mulberry when inoculating AMF through C. ensiformis was higher (490,28 mg 50 g^-1 of soil). The mycorhizal symbiosis 150 days after the treatments were applied was higher with AMF inoculated through intercropped C. ensiformis and complemented with F1 (375,33 spores in 50 g of soil and 1,46 % of visual density). The nitrogen extraction through the edible biomass, in the treatment of AMF inoculated via C. ensiformis with F1, varied between 245,68 and 336,75 kg ha^-1 in the rainy season and between 74,59 and 97,81 kg ha^-1 in the dry season. It is concluded that the highest distribution of roots in the soil, the best indicators of mycorhizal symbiosis and the highest nitrogen extractions of mulberry were positively associated to the inoculation with AMF through C. ensiformis, complemented with chemical fertilization.

Keywords : biomass; Canavalia ensiformis; fungi; inoculation.

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