Influência Do Substrato E Inoculação Micorrízica Na Produção De Mudas De Colubrina Glandulosa Perkins

Abstract

Revegetation of deforested Atlantic Forest areas can be carried out with seedlings of native tree species inoculated with arbuscular mycorrhizal fungi (AMF). This study aimed to evaluate the effect of different substrates in the absence/presence of AMF inoculation on growth and nutritional content of Colubrina glandulosa Perkins seedlings. The seedlings were grown in plastic pots under greenhouse conditions. The experimental design was completely randomized with 12 repetitions/treatment and eight treatments: T1 (20% cattle manure + 80% soil horizon), T2 (20% cattle manure + 80% soil horizon + AMF), T3 (20% cattle manure + 80% soil horizon + 20% sand), T4 (20% cattle manure + 80% soil horizon + 20% sand + AMF), T5 (20% cattle manure + 60% soil horizon + 20% vermiculite), T6 (20% cattle manure + 60% soil horizon + 20% vermiculite + AMF), T7 (60% soil horizon A + 20% cattle manure + 10% sand + 10% vermiculite) e T8 (60% soil horizon A + 20% cattle manure + 10% sand + 10% vermiculite + AMF). At 30, 65, 93 and 115 days after the beginning of the experiment, we evaluated the height (H) and collar diameter (DC). At 115 days, we evaluated the dry matter of shoot (MSPA) and root (MSR), MSPA/MSR ratio, rate of roots colonization by mycorrhiza (% COLRAIZ), quality index of Dickson (IQD), nutrient content (N, P, K) in the shoot and root, besides uptake efficiency of nutrients (N, P, K). We recommend the treatment T8 because it provided the production of seedlings with high values of most of the growth and nutrition variables analyzed.