Electroherb by zasso – Independent testimonies

The zasso clean weed control approach is already in use and has been validated by several independent organisations

Electroherb by zasso was originally developed in Brazil and is used there in different areas of urban, silviculture and agricultural applications. While long-term use and repeated service requests of customers are always the best evidence of efficacy, there are also several studies with a more scientific and testimonial background performed by independent institutions.

The following paragraphs show objectives and results of the studies in a short overview. These are English translations of the original Portuguese documents, and the original documents are available by request from zasso.

Study 1: Coffee and invasive weeds on different slopes

Performing institution: Fundacao Procafe, Alameda do Café,1000 – Jardim Andere; 37026400 Varginha-MG; Time scale of the study: April to November 2006 Experimental setup: Two areas of about 1.5 ha of coffee plantation in total were treated. While the more level area with a 5% slope was infested by spiderwort, the area with an inclination of 15% was covered with a large number of different weed species. Results (translation from the Portuguese): The process of electrocution

  • did not show selectivity in relation to the treated weed species  
  • did not cause any harm to or impairment of the treated crop 
  • showed great results in level areas with nearly 95% control of spiderwort 
  • showed problems in mountainous regions on uneven ground, reaching a control of nearly 65%

Conclusion (translation from the Portuguese): The destruction of weeds by electric discharges requires a direct contact of the weed with the electric applicator. This limitation leads to different weed control results in mountainous and flat areas.

Comment zasso: At the time of the trial, quite stiff electric applicators were used, also on the uneven ground. These have been significantly improved within the last 10 years. It should be noted that spiderwort is an almost glyphosate-resistant, tuber-producing, invasive plant, which is extremely difficult to control by any other means.

Study 2: Weed control in organic soybean using electric discharge

Performing institution: Embrapa Gado de Leite, Rua Eugênio do Nascimento, 610, 36038330, Juiz de Fora, MG, Brasil; II Universidade Federal de Lavras (UFLA), Lavras, MG, Brazil. Time of the study: 2006/2007 Experimental setup: Two experiments were carried out in a no-till organic soybean area in São Miguel do Iguaçu, Paraná State, Brazil, in order to evaluate weed control by electric discharge. The experiments were arranged in a complete block design, with four replicates. The voltages were fixed at 4,400 V (experiment 1) and 6,800 V (experiment 2). In both experiments, the treatments were undertaken by tractors with different revolutions: (i) 2,200 rpm (revolutions per minute); (ii) 2,000 rpm; (iii) 1,600 rpm; and two controls [(iv) non-weeded control and (v) weeded control]. Electroherb equipment (Sayyou do Brasil) was used to apply the electric discharges. The weeds presented in the experimental area were wild poinsettia (Euphorbia heterophylla), morning glory (Ipomoea spp.), prickly sida (Sida spp.), Alexandergrass (Brachiaria plantaginea) and crabgrass (Digitaria spp.). Plant height at time of treatment was between 4 and 8 cm, and application speed was 4 km/h. Results and conclusions: The electric discharge use was efficient in controlling weeds in soybean crop; 2,200 rpm produced efficient weed control and, consequently, a high soybean yield.

Weed control in organic soybean using electric discharge

Comment zasso: The results clearly demonstrate that inter-row electroweeding in soybean is as efficient as manual weeding. Since the time of the trial, the available electric power and voltages have been raised significantly, allowing a significantly higher performance of the Systems.