Patterns of photosynthetic indicators of giant miscanthus in the Right Bank Forest Steppe of Ukraine
Authors: Prysiazhniuk O. I. , Honcharuk O. M. , Kostyna T. P. , Kononiuk N. O. , Cherniak M. O. , Musich V. V. , Kachura Ye. V. 
Published: December 2024

Purpose. To establish the influence of the elements of cultivation technology on the formation of photosynthetic indicators in giant miscanthus.
Methods. The research was conducted at the Bila Tserkva Experimental Breeding Station of the Institute of Bioenergy Crops and Sugar Beet of the National Academy of Agrarian Sciences (Kyiv region) in 2019–2022. Miscanthus gigantheus variety ‘Osinnii zoretsvit’ was grown according to a three-factor field experiment design: factor A: inoculation: 1) without inoculation; 2) Azophosphorin, 1.0 l/ha; factor B: application of adsorbent: 1) without adsorbent; 2) MaxiMarin granulated, 30 kg/ha; factor B: foliar feeding: 1) without feeding; 2) Humifild, 50 g/ha; 3) Humifild, 50 g/ha + AminoStar, 1.0 l/ha.
Results. The highest leaf area in the experiment was formed in the treatments with inoculation using Azophosphorin together with the adsorbent and foliar application of potassium humate (Humifild) + antistressant AminoStar. Under these conditions, leaf area in the panicle formation stage of miscanthus was 60.7 thousand m²/ha. Inoculation with Azophosphorin had a positive effect on the photosynthetic potential of plantations, increasing the indicators by 0.19 thousand m²/ha × day in 2020, by 0.24 thousand m²/ha × days in 2021 and by 0.20 thousand. m²/ha × day in 2022. Application of MaxiMarin granulated adsorbent also contributed to an increase in photosynthetic potential: by 0.18 thousand m²/ha × day in 2020, by 0.21 thousand m²/ha × day in 2021 and by 0.18 thousand m²/ha × day in 2022. Under the combined effect of factors (inoculation + hydrogel) and treatment of plantations with potassium humate (Humifild), 50 g/ha + antistressant AminoStar, 1.0 l/ha maximum indicators of photosynthetic potential were achieved: 3.26 thousand m²/ha × day in 2020, 4.23 thousand m²/ha × day in 2021 and 3.58 thousand m²/ha × day in 2022. NPP, on average in the experiment was 2.16 g/m² × day in 2020, 4.99 g/m² × day in 2021 and 5.03 g/m² × day in 2022. Despite loss of sprouts in 2022, the giant miscanthus plants were able to regrow and form a high NPP. The use of inoculation with Azophosphorin increased the NPP by 0.19 g/m² × day in 2020, by 0.43 g/m² × day in 2021, and by 0.49 g/m² × day in 2022. Application of MaxiMarin granulated adsorbent increased NPP by 0.13 g/m² × day in 2020, by 0.34 g/m² × day in 2021 and by 0.62 g/m² × day in 2022. Under the combined effect of factors (inoculation with Azophosphorin and MaxiMarin granulated hydrogel) high NPP indicators were achieved: 2.34 g/m² × day in 2020, 5.40 g/m² × day in 2021 and 5.56 g/m² × day in 2022. No significant contribution of the factor of foliar application of humates and amino acids was found.
Conclusions. The data obtained in the experiment can be used to optimize the elements of the cultivation technology for giant miscanthus in the Right Bank Forest Steppe of Ukraine in order to increase the productivity of plantation.