The main goal of sowing is the distribution of seeds at an optimal depth with adequate seed spacings. The results of the optimal sowing, in both horizontal and vertical directions, are better germination and sprouting, as well as increased yield and reduced infl uence of plants on each other's space for growing, regarding the available light, nutrients and moisture. Quality of horizontal and vertical seed distribution is infl uenced by the distance between rows, sowing depth, pre-sowing preparation, seed drill, seeding mechanism, sowing density, and operator's skills. The arithmetic mean of spacing (Am), standard deviation for spacings between the plants (SD) and coeffi cient of variation (CV) are usually used for representation of sowing evenness. Assuming that the seeds are of good germination quality, the yield is directly dependent on the sowing quality and organization of plants per unit of surface area. A well prepared plot was sown with 20 corn seed hybrids from diff erent FAO maturity groups. The sowing was performed with precision pneumatic seed drill INO Becker Aeromat 2, which ejects individual seeds by using the overpressure.A er sprouting, no statistically signifi cant diff erences were found between the sowing of hybrids from diff erent FAO maturity groups and their characteristics. When the yield is concerned, biological characteristics of hybrids are much more infl uential than the quality of sowing. This is true only if the tractor implement for wide row planting is properly adjusted.

Precision sowing trend is development of technology of sowing maize. The advantage of planting corn with precision seeder includes saving seeds, fewer working hours, achieves more uniform spacing in the row and depth of planting, and for these reasons it follows that the crop will be uniform in height and strength, which is a prerequisite for high yields. It was performed a fi eld testing of three seed in sowing maize at three diff erent speeds of sowing. Tests were carried out to determine and compare the quality of three planters with under pressure. Seeders worked in similar conditions but third seeder noted presence of crust on the soil surface. They were tested at a speed of 6, 8 and 10 km/h. At a speed of 6 km/h all three planters worked with a coeffi cient of variation less than 25% and with values from 19.25 to 22.72%, which meets the criteria of quality planting. The percentage of pairwise from 1.66 to 2.64%. The percentage of empty spaces were from 4.24 to 4.93%. Proportion of seeds sown at a given space were from 92.5 to 94.09%, which is an indicator that sowing was successfully. No records are examined quality diff erences in sowing seed.

A b s t r a c t. This article deals with energetic evaluation and potential of pomace -a waste product originating during production of grape wine. Calorimetric analysis of 19 grapevine varieties was performed in 2013 and 2014. The aim was to specify their combustible limit and the gross calorific value. The evaluations were performed on pristine pomace, pomace without seeds, and only on seeds themselves. The results obtained imply that pomace is an interesting energetic resource with a gross calorific value of 16.07-18.97 MJ kg

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