The production of two generations of oil flax within one field season as a reserve for acceleration of the breeding process (report I)

The conducted analysis of climate changes in the Krasnodar region for the period of 1916-2013 indicates the occurred warming, and as a consequence, an extension of the plant growth season in this area. The hypothesis on the possibility of obtaining the second generations of oil flax during its sowing in the summer calendar dates (early June - early July) under the conditions of the central zone of the Krasnodar region is suggested. The analysis of the calendar dates of ripening of 7 oil flax varieties and lines sown in summer periods (June-July) confirms the suggested hypothesis and indicates its natural ripening in September and October, respectively. The summer sowing of oil flax after harvesting the spring generation of oil flax is proposed to use for obtaining the second generations of seeds in some breeding nurseries. It will allow reducing the process of breeding of new varieties of oil flax by 1-2 years.