Abstract
ABSTRACT: In recent years there has been a growing interest in the use of organic waste in agriculture. In this way, was aimed with this study to evaluate the biochar from pequi shell (Caryocar brasiliense Cambess) on the soil chemical properties and on the production and nutrition of common bean plants. The experiment was carried out in pots with soil (4 dm3 ~ 5,44 kg), in a completely randomized experimental design, 4 x 3 + 2 factorial scheme, with four replications. The treatments were four doses of biochar (0.0, 2.5, 5.0, 7.5 and 10.0 % v/v), three different particle size (G1, <0.5 mm; G2, 0.5-1,0 mm and G3, 1.0-2.0 mm) and two control treatments, one without and another with addition of soil corrective acidity. The biochar from pequi shell acted as a corrective of soil acidity and as a source of potassium for the plants. However, in higher doses of biochar there was a decrease in bean plants production due to nutritional imbalances.
Highlights
Agriculture and plant extractivism produce large quantities and diversities of organic waste that can be used by the agricultural activity itself, in order to reduce the pressure on natural resources and to promote the adequate disposal of these materials
The objective of this study was to evaluate the biochar produced from pequi shells on soil chemical properties and on the production and nutrition of common bean plants (Phaseolus vulgaris L.)
There was an effect of the interaction between treatments (P < 0.05) on total carbon, active acidity, exchangeable acidity (Al), cation exchange capacity (CEC) and base saturation (V) (Table 2)
Summary
Agriculture and plant extractivism produce large quantities and diversities of organic waste that can be used by the agricultural activity itself, in order to reduce the pressure on natural resources and to promote the adequate disposal of these materials. 70% of the average weight of the fruit is composed by shell, which after the withdrawal of the seeds, commercial part, is discarded in the environment without any disposal criteria. Other uses found in the literature are the adsorbent use of dyes and in biorefineries (RAMBO et al, 2015). Another important alternative for the disposal of pequi shells in the environment would be pyrolysis with subsequent incorporation into the soil. Pyrolysis acts positively in the treatment and reuse of waste generated in several activities, contributing to solve problems of waste and its environmentally correct disposal (ABDELHAFEZ et al, 2014)
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