||The results of the study of inbred lines of corn on the basis of economically valuable features, such as: growing season, productivity, moisture yield. To distribute our maize material by precocity, a number of studies were conducted, namely: estimating the length of the growing season "shoots-full ripeness", which was determined in days, and a very important indicator-grain moisture at harvest as a percentage, it allowed to distribute two groups: early-maturing – (106–114) and middle-early – 114–123 days. Over the years of testing, the weather conditions varied considerably, which made it possible to evaluate the material under study in detail. In 2020, the growing season in the early-maturing group of lines was within 104.0 days, which is almost five days less in 2019. This trend was also observed for the group of middle-early lines. At the same time, the longer vegetation period was in 2019.
Therefore, the aim of our study was to analyze the rate of moisture yield of corn grain of the studied lines of different maturity groups. The conducted researches allowed to trace the dynamics of grain moisture yield of corn lines of different maturity groups, to determine the variability of grain moisture of hybrids in different periods of grain maturation. 2019 was more favorable for growing corn, the plants formed a large vegetative mass, but the grain had a high humidity during the harvest period. This is due to a significant amount of precipitation (46.0 mm) in September 2019. Lines that had high harvest humidity were characterized by a long growing season, such as Um 337 and VIR 44. The group of the most productive included lines Um 337, Um 331, F7 and line MAN 053, which were ahead. The following year, Mind 337 and Mind 331 as a whole confirmed their positions, while F7 and MAN 053 yielded significantly lower yields