Physical and mechanical properties of grain of spring barley varieties in the conditions of Tatarstan

The aim of the work is to analyze the physical and mechanical properties of grain of spring barley varieties cultivated in the conditions of the Predkamsk zone of the Republic of Tatarstan. The research was conducted in Tatarsky Research Institute of Agriculture FRC of Kazan Research Center RAS in 2015–2022. In the conditions of the Predkamsk zone, on average over the years of research, the late maturing variety Endan was characterized by reliably high values of 1000 grain weight (48.5 g), the early maturing variety Kamashevsky – reliably high values of natural grain weight (686, 3 g/l), convergence from 2.8 x 20 mm sieve (33.9 %) and coarseness (70.02 %), medium maturing variety Raushan – higher variability in 1000 grain weight (18.6 %), convergence from 2.8 and 2.5 x 20 mm sieves (55.6 and 29.7 %, respectively) and coarseness (39.5 %). The direct dependence of the mass of 1000 grains, runoff from the sieve 2.8 x 20 mm and coarseness on the sum of precipitation (r = 0.41/0.58/0.56, respectively), GTC (r = 0.40/0.58/0.55, respectively) and inverse dependence of these physical and mechanical properties on the average daily air temperature (r = -0.51/-0.62/-0.63, respectively) of the interphase period "earing-full ripeness" were established at 1% significance level. Judging by the value of the coefficient of determination (r2), the most closely related to the average daily air temperature are the signs "mass of 1000 grains", "drift from the sieve 2.8 x 20 mm" and "coarseness". The analysis of path coefficients revealed a high direct positive contribution (0.87) of 2.8 x 20 mm sieve runoff and an average direct positive contribution (0.43) of 2.5 x 20 mm sieve runoff to grain yield. Under the conditions of the Predkamsk zone, the prevailing contribution to the total variance of the traits "drift from the sieve 2.8 x 20 mm", "coarseness", "weight of 1000 grains", "bulk grain weight", "drift from the sieve 2.5 x 20 mm" was made by the factor "year", which accounted for (in descending order) 81.7...80.3...76.6...76.2. 68.7 %, respectively.

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