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green and yellow pigments of spring oats cultivated for harvesting cryofodder in the conditions of Central Yakutia

The influence of a late sowing date on the pigment content of an autumn vegetative plant in Central Yakutia (62°15′ N, 129°37′ E) has been studied for the first time. The experiments were carried out using spring oat, Avena sativa L., cultivar (cv) Pokrovsky, commonly used in the preparation of cryofodder, the seeds of which were planted according to the optimal (17 June) and late (25 July) sowing dates. It was established that till the end of the first decade of September the content of chlorophylls (15-16 mg/g dry weight) and carotenoids (2,9 mg/g dry weight) in the leaves of late sowing plants were higher by 11–13 % compared to control plants at the same phases of growth and development. Autumn decrease in temperature from the second half of September until the beginning of October (from +7…+8 °C to near-zero) led to a gradual reduction of chlo- rophylls ( a + b ) content by 40 %.