INFLUENCE OF SOWING RATES ON THE GROWTH AND DEVELOPMENT OF GRAIN SORGHUM IN NORTH-EASTERN PART OF UKRAINE
Abstract
Sorghum is a crop with high economic value, used for food needs, animal feed and as a commodity for export. Sorghum is associated with possible scenarios of future agricultural production in the conditions of climate change. It is sorghum, as a stress-resistant crop, that can replace traditional grain crops. The biological features of sorghum and the future prospects of crop growing attract the attention of many researchers in different regions of the world. Considering this, the study of the sorghum characteristics in the conditions of North-Eastern Ukraine is relevant. The search for the optimal sowing rate and plant density in the agrocenosis is the basis for obtaining the optimal crop, achieving high yield and maximum profit. To realize the maximum yield potential, a balanced number of individuals in the plant population is necessary, i.e. a certain level of sowing density. For this purpose, in 2020–2022, experiment was carried out with sorghum crop. The aim of it was to study the optimal sowing rates of grain sorghum and the influence of stem density (agropopulation structure) on the growth and development of plants in the conditions of the North-Eastern Forest Steppe of Ukraine. The influence of different sowing rates on grain sorghum varieties and hybrids was investigated (Yanki, Kraevyd, Dniprovskyi 39, Samaran 6) by analyzing the growth and development characteristics of plants. The obtained data showed that with an increase in the stand density , the number of leaves per plant decreased significantly in all variants of the experiment in all variety samples. Thickening with stalks (sowing rate of 490 th ha) led to an increase in the height of plants, negatively affected the area of the leaf surface of plants (the number of leaves and their area decreased) and the content of pigments (chlorophyll a and chlorophyll c) in the leaves The optimal sowing rate for the formation of vegetative organs of plants and the assimilation area was 165 th/ha. At the same time, the ambiguous reaction of the variety samples to certain options sowing rates indicates the need for additional research.
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