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Abstract
The work was carried out in the climatic conditions of Western Siberia (Tyumen) in 2015-2022 in order to predict the forage and seed productivity of red clover, taking into account the weather conditions of the growing season. The productivity of vegetative mass in dry form and seeds was estimated in 15 varieties of red clover of late-ripening type with the row sowing method. The meteorological conditions of the 7 years of research on the hydrothermal coefficient (HTC) of Selyaninov’s humidification varied from very dry (HTC = 0.48 in 2021) to excessively moist (HTC = 1.72 in 2019) and deviated from the norm both by month and for the entire growing season (HTC = 1.43). The productivity of vegetative mass (hay) in red clover samples averaged 7.0 ... 17.7 t/ha, seeds - 0.151 ... 0.511 t/ha. The highest hay yield (17.7; 15.7 t/ha) was observed in the years with sufficient moisture in 2018, 2019 (HTC=1.24…1.89), the lowest (7.0; 9.8 t/ha) − in dry conditions of 2020, 2021 (HTC=0.98…0.28). The ratio between the hay and seed yield in different years varied from 14:1 to 105:1, the percentage of seeds in the total yield ranged from 0.9 to 6.8%. With a high hay yield (15.7; 17.7 t/ha), the share of seeds in the total yield decreased to minimum values (0.9 and 1.1%). Over 7 years, a negative correlation from medium to strong (r=-0.5…-0.9) was noted between hay and seed yields in 11 varieties. Sufficient moisture conditions contributed to the development of vegetative mass, while dry conditions contributed to an increase in seed yield. The response of genotypes to changes in environmental conditions was unstable; the best in the experiments were 2 samples: 11-6-67 and 21-2-58(2).
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