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Photosynthetic parameters of durum winter wheat plantings depending on the variety

Under different weather conditions, not all plant varieties successfully adapt to agro-ecosystems. Given that, wheat is the most important food crop It is important to study the possibility of its adaptation to climatic conditions. The choice of plant variety is the first, most important and most difficult stage for wheat producers. Aim. To study the parameters of photosynthetic activity of durum winter wheat plantings depending on the variety. Methods. Laboratory, mathematical and statistical, physical. Results. The article presents the formation of photosynthetic parameters (length, leaf width, number of leaves on one stem, area of one leaf, area of one stem, leaf surface area, apical leaf parameters) of durum winter wheat plantings depending on the variety. The length and width of durum winter wheat leaves varied significantly depending on the variety and stage of plant growth. On the average for three years of researches the number of leaves on one stem in the tillering stage was 4.1–4.5 pieces depending on the variety. In the booting stage, this indicator was the lowest – 3.1–3.3 pieces, and in the earing stage of all varieties was at the level of 4.0 pieces. The number of leaves on the stem almost did not change during the milk stage of grain – 3.9–4.0 pieces. The parameters of the apical leaf also varied significantly with weather conditions. The area of apical leaves in 2013 in the standard and studied varieties was 5.9 and 5.5–7.3 thousand m2/ha, respectively. In the following 2014, the leaf area indicator was higher than in 2013 by 51–60%. The increase in leaf area in durum winter wheat in 2014 is due to the formation of a higher number of stems compared to 2013. Conclusions. Photosynthetic parameters of durum winter wheat plantings have features. The number of leaves on one stem changed the least depending on the year of study, as the variation coefficient was insignificant (V = 1.7–3.6 %). The length and width of durum wheat leaf varied in a wide range - V = 3.7–53.0 %. In the more favourable 2014, the leaf surface area was 40.1–71.0 thousand m2/ha in the earing stage, and in the less favourable – 15.9–29.0 thousand m2/ha in the earing and milk stages of grain depending on the variety. The area of apical leaves varies from 5.7–7.3 to 8.8–14.2 thousand m2/ha depending on the weather conditions of the season