Within the context of precision agriculture, the use of automatic guidance is without a doubt one of the most popular tools among farmers, however, are few producers of peanuts using this technology, the benefits from this technology can bring significant gains for culture even more when thinking about reducing the indices of losses in the digging. Thus, it objective was to evaluate the variability of quantitative losses of peanut mechanized digging with use the autopilot, using the Statistical Process Control. The treatments consisted of absence of autopilot use in sowing and digging, pilot's absence at sowing and presence in the digging, pilot use at sowing and absence in the digging and the pilot use in sowing and digging. In each treatment, 15 points of each variable was collected from distance of 50 m apart. Visible, invisible and total losses in the digging and parallelism were evaluated. The reduction of the plant material on the vibratory mat affected the levels of visible losses. Total losses are strongly correlated with the invisible losses. The use of the autopilot allows the operator to pay more attention to the digging operation improving the quality of the operation. The average error found between passes of the mechanized set using autopilot was 0.35 m. The variability of the losses as well as of parallelism was reduced when using the autopilot in two operations, providing a higher quality process.

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RESUMO Escolhas no manejo cultural, como a do cultivar e a do sistema de colheita, podem influenciar os índices dos parâmetros de qualidade da fibra do algodão. Objetivou-se, com este trabalho, analisar as características das fibras de dois cultivares de algodão submetidos a diferentes sistemas mecanizados de colheita (picker e stripper). O experimento foi conduzido na safra de 2012, com espaçamento de 0,45 m entre linhas, no município de Juscimeira, MT. Utilizou-se delineamento em blocos casualizados, em esquema de parcelas subdivididas, com dois fatores, sendo eles, A, nas parcelas (dois cultivares) e B, nas subparcelas (três sistemas de colheita - manual, picker e stripper), com cinco repetições. A qualidade da fibra foi determinada em amostras coletadas manualmente da planta e, após a colheita mecanizada, retiradas de dentro do cesto armazenador de cada colhedora. As análises das características das fibras foram realizadas em Laboratório de Classificação de Fibras, com o aparelho HVI (High Volume Instrument). As fibras do algodão colhido com o sistema manual, em seguida, sistema picker apresentam melhores características e melhor qualidade que as das fibras colhidas com stripper.