EFFECT OF SOWING SPEED AND WIDTH ON SPACING UNIFORMITY OF PRECISION SEED DRILLS

The precision seed drills significantly improve the competitiveness of farms, in terms of sowing quality and yield. This paper refers to the field performance of the tractor-seed drill system and the seed spacing uniformity with reference to three precision drills with 4, 6 and 8 sowing units, respectively. The tests have been conducted using graded maize and sugar beet seeds, according to ISO 7256-1:1984 standard, under three speed conditions (5.0, 6.5 and 8.0 km h(-1)). The seed drills showed high values of the quality of feed index (> 90%) even at the higher speed. The multiples index and the miss index were very low.