Lupine narrow-leaved variety selection depending on climate conditions

In order to establish the influence of climatic indicators on the duration of the growing season in the Moscow region, long-term field trials (2009–2020) of narrow-leaved lupine varieties with the usual indeterminate monopodial-sympodial branching (Belozerny 110 and Nemchinovsky 846) were carried out in comparison with determinant varieties of spike-like (epigonal ) type (Dikaf 14 and Ladny). The average monthly air temperatures during the growing season in the first years of observations (2009–2014) exceeded the average long-term values, but later began to often decrease to the level and below the average long-term data. The difference in ripening dates between spike-shaped and indeterminate varieties did not exceed three days in six years, was within 7–12 days – for four years, from 9 to 24 days – in 2017, more than 45 days – in 2019. An increase of the average daily air temperature by 1°C in 38 – 78 % of cases accelerated the onset of the flowering date and the maturation date of indeterminate varieties by an average of 1.9...2.5 days and 6.2...7.5 days, respectively; of spike-like varieties by 1.3...1.4 days and 2.8...3.3 days, respectively. In other cases, changes in the duration of phenological periods are due to the influence of less significant (tr