Descarte nas etapas do beneficiamento de sementes de soja

Abstract

Due to the great importance of soybean in Brazilian agriculture generating frontiers and increasing exportations, the use of quality seeds becomes a fundamental necessity, since this insume carries the desirable characters that result in higher productivity each harvest. This study case has the objective of evaluating losses in the soybean seed production of Sementes Petrovina Company, located in the state of Mato Grosso, during different steps of seed conditioning. Data were collected from discharges of pre-cleaning, post-cleaning, spirals separator, and gravity table of 3 cultivars, comparing/contrasting the results of 4 different crops. Data vary from crop to crop inside each cultivar mainly in relation to the discharge generated by the spirals separator, which is attributed to the form of the seeds, and the cultivar development during the rain period of each crop. The spirals separator was responsive for the largest fraction of discharge, representing half of the total discharge originated by the cultivar. It is suggested disusing this equipment when of high quality seeds, and grading the seeds with less than 1 mm sieves which would considerably reduce the discharge fraction lowing farmer s losses.