Mineral nutrition and production of beans in areas managed with and without burning of organic residues and different fertilization types

Abstract

The use of organic residues in agriculture has motivated the development of researches that seeks for the sustainability of the production. The agricultural use, in nature or in the form of compounds of twigs and branches resulting from the pruning of trees in urban centers can be considered as a source of organic fertilizer to various crops. Through a simulated situation of areas managed using the fire, this work was led to evaluate the effects of doses, burning of organic residues and fertilization types on the components of the production, leaf contents of macronutrients and on the yield of two cultivars of carioca beans (IPR Colibri and IPR Eldorado) cultivated in rotation system with corn crop. Two experiments were installed: Experiment I - with the burning of the residues; and Experiment II - without the burning of the residues. For each experiment it was used a randomized block design with three replications in a 4x2 factorial arrangement, in which the factors were four doses of organic residues (0, 15, 30 and 45 Mg ha^-1) and two fertilization types (EOF: organic fertilization and OMF: organic mineral fertilization). To evaluate the effect of fire on the productivity of bean cultivars was performed a joint analysis between experiments I and II. The components of production, the leaf nutrients contents and the productivity of bean cultivars IPR and IPR Colibri Eldorado were always higher with organo-mineral fertilization. Comparing the experiments it was found that the productivity of the bean IPR Colibri was higher than on treatment without burning of residues associated with mineral fertilizer.