Keywords: raw fat, raw ash, raw protein, raw fiber, nitrogen-free extractive substances, plants, leaves, stems, wrappers, maize cobs, biochemical composition, feed units, exchange energy

// Мелиорация.– 2022. – №2(100) – P 24–31

In 2019‒2021, in the central part of Belarus, studies were conducted on the derno-podzolic consolidated loamy soil with three maize hybrids (DN Piviha – FAO 210, Polessky 202 – FAO 230 and DN Galatea – FAO 250), cultivated at a plant density of 70, 90, 110 and 130 thousand/ha, two terms of sowing and harvesting with a differ-ence of 2 weeks. The biochemical composition of maize plants and its morphological parts was studied, which made it possible to identify the following patterns. The stems have the lowest fat content (1.0 %), the cobs have the highest fat content (3.6 %), with an average accumulation of it in plants of 2.3 %. The ash elements are respectively 1.6 % in the cob, 6.9 % in the leaves and 4.0 % in the plants. Protein is less in the stems (3.6 %), more in the cob (8.7 %) and on average in the plant contains 6.7 %. Fiber is less in the cob (7.5 %), more in the stems (36.2 %), in the plant – 23.0 %. The nitrogen-free extractive substances is less in the leaves (49.5 %), more in the cobs (78.8 %), in the plant – 64.0 %. Weather conditions of the year are the most significant factor affecting the change in the biochemical composition of plants and some morphological parts of maize.