Two experiments were carried out in no-till organic soybean area in São Miguel do Iguaçu, Paraná State, Brazil, in order to evaluate the weed control using electrical discharge. The experiments were arranged in a complete block design, with four replicates. The voltages were fixed in 4400V (experiment 1) and 6800V (experiment 2). In both experiments, the treatments consisted by different revolution tractor: (i) 2200rpm (revolutions per minute); (ii) 2000rpm; (iii) 1600rpm; and two checks [(iv) unweeded control and (v) weeded control]. The equipment Eletroherb (Sayyou do Brasil) was used to apply the electrical discharges. The weeds presented in the experimental area were wild poinsettia (Euphorbia heterophylla), morningglory (Ipomoea spp.), prickly Sida (Sida spp.), alexandergrass (Brachiaria plantaginea) and crabgrass (Digitaria spp.). The electrical discharge use was efficient in controlling weeds in soybean crop; 2200rpm produced efficient weed control and, consequently high soybean yield.
Glycine max; high voltage; ecological agriculture; organic agriculture
