Tests on comparison of the operative performances and work quality of three precision drills for maize sowing
Fanigliulo, R.; Pochi, D.; Grilli, R.
Proceedings Int. Conf. on Agricultural Engineering AgEng 2008, Hersonissos, Crete-Greece, June 23-25
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Pneumatic precision drills for maize sowing significantly contributed to increase the competitiveness of farms and their income levels, in terms of quality yield. The aim of the manufacturers is to improve the accuracy in seed placement, often electronically controlled, according to the cultivation standard requirements. Soil conditions, seed spacing and working speed represents the main factors affecting drills performances.
The objective of this paper is to compare the operative performances regarding the tractor-drill system and the quality of work of three precision drills, equipped with double furrow-opener disk. The field tests have been conducted using calibrated maize seeds, for evaluating the accuracy of the seed metering systems, in terms of distance between seeds in a furrow, 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 (95.4 up to 98.8% ) 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 the seed spacing shows that the seeds deposited at the theoretical seed spacing decrease at higher working speed.