Mineral nutrition and tolerance to Colletotrichum spp. of Andean blackberry (Rubus glaucus Benth.) in nursery

Introduction. Several diseases affect the Andean blackberry cultivation in Colombia, where anthracnose (Colletotrichum spp.) stands out for generating total losses. Objective. To estimate doses of N, P, K, and Ca that allow greater tolerance to C. gloeosporioides strain 52 seedlings. Materials methods. The experiment was carried 2017, a greenhouse located Mosquera department Cundinamarca (Colombia), with seedlings sown substrate based on 3: 1 mixture peat rice husks. A randomized complete block design central composite arrangement 25 treatments 15 were used per experimental unit. inoculation plant material 53 days after had begun application treatments, mycelial discs at concentration 9.53×104 conidia. severity percentage (Sev), incubation period (IP), disease development rate (r), height (PLH), stem diameter (StD), leaf area (LA), chlorophyll content index (CCI), dry weight aerial part, nutrients measured. analysis variance Tukey’s test (p<0.05), correlation analysis, generation response surface models, principal component t-test (p<0.05) out. Results. showed significant differences plants received fertilization allometric variables, negatively significantly related percentage. Simple linear effects models interaction between elements four components obtained, which explained 63 % observed variability. Conclusions. 55, 3, 14, 9 g P2O5, K2O, CaO, respectively, allowed higher against 52, as well values growth variables.