Influence of HTC of the growing period on the height of peas plants and their resistance to logining

Abstract

In the process of breeding work with the Pisum satvum L. it was noticed that the same samples in different years may belong to different gradations of plant classification according to stem length. Resistance to lodging (RL) of samples in years with contrasting heat and moisture conditions may also have different estimates. In this connection, the purpose of the research was to identify the dependence of plant height and resistance to lodging of peas on the hydrothermal coefficient (HTC) of the growing season. The research was carried out in 2019 2023 in the forest-steppe of the Krasnoyarsk Territory, in the competitive variety testing nursery of the pea breeding laboratory of the Krasnoyarsk Research Institute of Agriculture. The soil of the site is represented by ordinary chernozem of medium thickness, medium humus with neutral acidity. For the study, 8 samples of selfselected peas were taken. Samples were arranged in a systematic manner in quadruplicate, the plot area being 15 m2. During the research, it was revealed that in order to objectively characterize pea samples by stem length and its resistance to lodging, it is necessary to take into account the HTC of the growing season, since the differences between the lengths of plants in years of different HTC of the growing season can change by 2 times. The length of plants depended significantly on the hydrothermal coefficient of the growing season; separately for the months of the growing season, it was revealed that the strongest direct correlation is typical for August r ± Sr = 0.88 ± 0.08. The maximum lodging of samples was noted during an excessively humid growing season, the minimum during a dry one, the difference in the assessment could reach one point. An increase in HTC had the maximum effect on reducing the resistance to lodging of semi-dwarf samples and the entire sample; medium-sized samples showed an average degree of dependence. When analyzed by month of the growing season, the greatest influence on the decrease in plant resistance to lodging had the August HTC r ± Sr = -0.95 ± 0.18, p = -0.75.