Desenvolvimento de mudas de café arábica cultivar Arara submetidas a diferentes doses do biofertilizante Agrobio

Abstract

Agrobio is a biofertilizer developed by PESAGRO-RIO, and produced from fermentation of fresh cattle manure, water, milk, cow urine, molasses and mineral salts in open system. It has a nutritional effect and promotes phytosanitary control in different cultures. This work evaluated the effect of Agrobio biofertilizer on the development of Arabica coffee seedlings, cultivar Arara, in the municipality of Andradas-MG. The experimental design was in randomized blocks, with five treatments and four replications. Each plot consisted of 16 seedlings, with the four central seedlings being used for evaluations. The treatments differed by the concentrations of biofertilizer sprayed at 0%, 2%, 4%, 6% and 8%. The variables evaluated were: seedling height, stem diameter, number of leaves, fresh mass of leaves, stem and root and dry mass of leaves, stem and root. The final incidence of cercosporiosis, caused by the fungus Cercospora coffeicola, was also evaluated. The treatments were carried out from the appearance of the first pair of leaves and were reapplied every fortnight, until the seedlings reached the field point. The assumptions for carrying out the analysis of variance were tested and, after being met and when there was significance by the F test between the doses of Agrobio by the analysis of variance, regression models were adjusted for them considering a 5% probability of significance. It was verified that the effect of the doses of Agrobio on the variables Height and Incidence of Cercosporiosis was quadratic positive, presenting a maximum point of 161.5mm in height and 32.5% of leaves with blotch. As for the Stem Diameter, Root Fresh Weight, Stem Fresh Weight, Root Dry Weight and Stem Dry Weight, the behavior was linear and increasing. In three variables (Number of Leaves, Fresh Weight and Dry Weight of Leaves) there were no significant results between doses of Agrobio biofertilizer. From these results, it is concluded that the Agrobio bioferilizer represents a viable option for the coffee grower in the production of seedlings, improving its vegetative development and helping to control Cercospora coffeicola.