Editing Trofim Lysenko (section)

==="The influence of the thermal factor on the duration of plant development phases"===
In Ganja, Lysenko began work on studying the [[growing season]] of agricultural plants ([[Gossypium|cotton]], [[wheat]], [[rye]], [[Avena|oats]], and [[Hordeum|barley]]). For two years, Lysenko experimented with the timing of sowing grain, cotton and other plants, sowing plants at intervals of 10 days. Based on the results of these studies, in 1928, he published a large work, "The influence of the thermal factor on the duration of plant development phases."<ref name="Voinov"/> Of the 169 pages of the work, 110 contained tables with primary data. The mathematical processing of the data was carried out by Nikolai Derevitsky and I. Yu. Staroselsky.<ref name="Soifer"/>

In this work, Lysenko came to the conclusion that each phase of plants ("the following phases were recorded: sowing-watering, germination, [[Tiller (botany)|tillering]], booting, heading, [[Anthesis|flowering]], wax ripeness and harvesting time") begins its development "at a strictly defined intensity of thermal energy, that is, at a certain, always constant degree Celsius, and requires a certain amount of [[degree days]]." Carrying out mathematical processing of the initial data using the [[least squares]] method, Lysenko determined the values of the constants A and B - "the starting point at which processes begin" and "the sum of degrees required to complete the phase."<ref name="Soifer"/>

In 1927, the main provisions of this work were reported by Lysenko at the "congress convened by the [[People's Commissariat for Agriculture]] of the Azerbaijan SSR at the Ganja station," and then, in December 1928, at the All-Union Meeting of Sugar Trust in Kiev. In this book, Lysenko thrice cited the work of {{ill|Gavriil Zaitsev|ru|Зайцев, Гавриил Семёнович}}, dedicated to the same issues.<ref name="Soifer"/>