DYNAMICS OF THE HEIGHT OF THE MAIN STEM OF MEDIUMFIBER GENOTYPES COTTON SELECTED BY PHOTOSYNTHETIC TEST-SIGNS AND THEIR PRODUCTIVITY

Abstract

The article presents some results of the comparative evaluation of various
samples (hybrids) selected by photosynthetic test features with their parent initial
forms and standard variety. The height of plants is another sign of a change in the
balance of the outflow of assimilates in plants of new varieties, it also allows you
to increase the harvesting index (economic yield).
Based on the conducted research, the conclusion is made and the prospects
of directed breeding work to study the relationship between the dynamics of the
height of the main stem of the genotypes of medium-fiber cotton with their
productivity. It has been experimentally established that the hybrid combinations
studied by us have high values of the main components, the structure of the crop
(the number of boxes per plant, the mass of the raw material of one box), as well as
the yield of raw cotton, the height of plants significantly affects the value of these
indicators.
Thus, measurements of the dynamics of the height of the main stem of
plants of hybrid combinations carried out in various phases of cotton
development indicate that, starting with the onset of the phase of mass budding
(33.2 cm), this sign gradually increases, reaching its maximum values in the phase of
mass maturation of plants (109.6 cm).
At the same time, the yield of raw cotton over the years of research was in
a wide range from 52.0 to 121.7 g/plant. The superiority relative to maternal and
paternal forms was noted – by 2.5-73.5 g /plant.