The generation and disposal of agro-industrial and rural biomass has generated much research
due to its polluting capacity as well as its energy potential. The objective of this study was to
present a technology accessible to family farmers in the Cachoeira Community. The project was
developed in four stages: Construction of the biodigester; Production of biofertilizer, a byproduct of the biodigester; Analysis of the application of biofertilizer in radish cultivation and
elaboration of the Basic Guide on Biodigesters. The Quatro Irmão site was used to build a
biodigester as a demonstration unit. In the sheepfold located next to the digester, animal waste
was collected for 30 days and later inserted into the digester in a 1:3 proportion (each kg of
waste mixed with 3 liters of water). This study presents the feasibility of implementing a
biodigester as an alternative to the treatment of waste, generation of alternative energy in the
form of biogas and the use of biofertilizer in vegetable crops, also addressing the environmental
benefits of the digester for family producers. The transition from conventional to sustainable
management is a possibility of renewal, in which plants become more dependent on microbial
influences, constituting a very important element in managing productivity and quality in
agricultural ecosystems. Based on this assumption, it is proposed to examine increasing doses
of biofertilizer produced with sheep manure in radish culture. The experiment was carried out
in a randomized block design, from January to February 2022, with four doses of biofertilizer
and a control with four replications as treatments, as described below: TO = no use of
biofertilizer (only H2O); T1 = 100 ml of biofertilizer; T2 = 200 ml of biofertilizer; T3 = 400ml
of biofertilizer; and T4 = 800ml of biofertilizer. The doses were applied after dilution of the
biofertilizer in 2 liters of H2O. The radish was cultivated for 39 days and the following variables
were subsequently evaluated: a) total plant height, b) total root length, c) stem diameter, d)
number of leaves, e) total fresh mass of the plant. There was no significant difference between
treatments for the variables analyzed. This fact may have been influenced by the high rainfall
that occurred during the cultivation period, with intense rainfall and possible leaching of the
biofertilizer.
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