THE IMPACT OF MAIZE FRACTION AND TECHNICAL ADJUSTMENT FACTORS ON THE WORKING QUALITY OF THE PSK4 SOWING MACHINE

摘要

This paper demonstrates the maize sowing quality results obtained at a test bench. The sowing quality determination is illustrated using the sowing quality indices (ISO standard 7256/1 and 7256/2), i.e. the MISS, MULT, and QFI indices. The research examined a sowing–quality influence of four different maize–seed fractions with two hybrids. A sowing simulation was performed with different technical sowing parameters (two vacuum pressures, three working speeds, and four different grain–selector positions).With the aforementioned research parameters, a statistically significant difference was detected pertaining to different grain fractions, grain–selector positions, vacuum pressure and working speed concerning the intrarow grain spacing of both maize hybrids researched. The PSK 4 vacuum sowing machine scored the high sowing quality coefficients (QFI index 98.6%) at a working speed of 4 km h-1 and with the grain selector positioned at 10 and can be classified in the group of the very good sowing machines. With regard to the H1 maize hybrid, the average intrarow grain spacing amounted to 19.60 cm, which ensures a set of 72,448 plants per ha, while the set amounted to 72,831 plants per ha (having an average intrarow spacing of 19.51 cm) with regard to the H2 maize hybrid. Concerning a grain intrarow spacing, a statistically significant difference between the hybrids was determined by the LSD0,05 test.