Rafael Scabello Bertonha1, Rouverson Pereira da Silva1, Carlos Eduardo Angeli Furlani1 and David L. Wright2, (1)Department of Rural Engineering, Sao Paulo State University - FCAV/UNESP, Jaboticabal - Sao Paulo, Brazil (2)University of Florida, Quincy, FL
Due to the many factors that affect the peanut crop (Arachis hypogaea L.), especially at the time of digging, setting the starter becomes very important as it may affect significantly the losses in this crop. The aim of this work was to evaluate the losses in peanut digging as a function of different rotations from digger shaker. The experiment was conducted in the FCAV, UNESP – Univ Estadual Paulista, Jaboticabal city, São Paulo State, Brazil. Was used seeds of peanut (IAC Runner 886 cultivar) and for the peanut digging was used a digger 2x1 (two lines x one windrow), pulled by a tractor with a power of 80.9 kW. The experimental design was a split plot strip block with five replications. Was used the tractor engine rotations at 20.0; 23.3; 26.7 and 30.8 Hz, which resulted in rotations in the shaker of 1.7; 1.8; 2.1 and 2.4 Hz. The results were analyzed using descriptive statistics and submitted to analysis of variance by F test of Snedecor. According to the analysis, it can be stated that the higher the speed of the tractor, the greater will be the loss in peanut digging, even with no statistical difference between the rotations. The ideal is the equipment has a different rotation of the tractor, able to change the rotation or speed of the tractor without interfering in the rotation of the digger. Making a calculation of economy between the highest and lowest rotation can be obtained 16.4% more production if work with lowest rotation, in other words, it is obtained 286.25 kg ha-1 over in the peanut production. It is likely that with the lowest speed, it can reduce the fuel consumption and emission of greenhouse gases.