The investigations were conducted in the years 1999-2000 on medium-heavy soil. Five maize cultivars were mowed at the height of 10-15 cm and 40 cm higher. It was found that increasing the mowing height to approximately 55 cm lowered the whole plant yield by 16%, while the dry matter yield by 8.9%. At the high mowing height the silage value was higher, which was observed in an increase in the dry matter content in the whole plants by 3.1%, while the percentage of ears in the fresh matter increased by 6.8% and in the dry matter – by 5.2%, respectively. In spite of high variability in earliness, the cultivars investigated did not differ significantly in dry matter contents at harvest. However, considerable differences were observed in the dry matter yields and the percentage of ears. Medium-late cultivars ‘Magister’ and ‘San’ yielded higher with more advantageous structure that the early cultivar, ‘Rasant’.

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