Field performances of three precision drills with a different number of sowing units
Pochi, D.; Grilli, R.; Brannetti, G.; Cervellini, C.; Fanigliulo, R.
Proceedings of the Int. Conf. on Agricultural Engineering AgEng 2010 “Towards Environmental Technologies”, Clermont-Ferrand, France, September 6-8
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In a context of increasing input of high technology solutions in agricultural mechanization, the pneumatic precision drills significantly contributed to improve the competitiveness of farms, in terms of quality and yield. This paper refers about the operative performances of the tractor-drill system and the seed spacing uniformity with reference to three precision drills with, respectively 4, 6 and 8 sowing units. The field tests have been conducted using a graded maize seed, according to ISO 7256/1 standard, under two speed conditions (about 6.5 e 8.0 km h-1). The tested drills showed high values of the quality of feed index (> 90%) testifying the efficiency of the single seed metering systems, even at the higher velocity (> 8.0 km h-1). The multiples index and the miss index are generally very low. The frequency distribution of seed spacing shows that the seeds deposited at the theoretical seed spacing decrease at higher working speed.