GROWTH RHYTHM OF INTRASPECIFIC FORMS OF WHEAT

Abstract

In this article, in order to increase the gross grain yield in the Republic of Uzbekistan, which has different agro-ecological zones, a wide range of varieties that differ in physiological, genetic, biological and economic characteristics, most suitable for cultivation in certain soil-climatic zones There was a talk about the need to create. It is almost impossible to create by selecting such varieties. In this regard, it is important to choose hybridization and promising directions, which are the most effective ways to obtain varieties that meet the requirements of modern plant growing. The data obtained on the study of the growth rhythm of intraspecific forms of wheat showed that the duration of the period from germination to emergence into the tube varies less. This is explained by the dominance of this trait in the direction of the accelerated development of plant forms. However, at late sowing dates, the linear growth of the aboveground part of the plants began after the emergence of seedlings. therefore, the duration of the period from germination to the first measurement averaged 22 days[1]. But over time, the speed of wheat plants in all variants slows down slightly, but the highest growth rates are characterized by forms F-1 and F-2. It should be noted that the period of growth and development of wheat from booting to heading differ little from each other and the difference varies within forty days. Thus, the results of the studies carried out show that the rate of growth processes of intraspecific forms of soft spring wheat varies depending on the genotype and environmental conditions during the growing season of plants. The results of the studies showed that both the parental samples and the studied forms of wheat are characterized by instability of growth processes depending on the growing conditions, which is explained by the significant dependence of genotypes on growing conditions [4].