VARIABILITY OF KERNEL-PRODUCING CAPACITY OF SPIKE IN SPRING COMMON WHEAT DEPENDING ON GENOTYPE AND GROWING CONDITIONS IN FOREST-STEPPE AREAS NEAR THE OB
There are presented the results of research into the variability of kernel-producing capacity of spike in varieties and lines of spring common wheat depending on genotype, sowing date, forecrops and growing conditions. The experiment was carried out in the forest-steppe areas near the Ob in Western Siberia, and the field experimental data obtained were verified by the three-factor variance analysis. A contribution of the genotypic variance to general variability of the trait made up from 35.4 to 55.2 %, while a proportion of variance caused by a sowing date was from 9.1 to 16.9%, and that caused by forecrop diversity from 1.4 to 5.4 %. The average kernel weight of the spike in early-ripening varieties was 0.98 g on fallow and 0.82 g while grown in land ploughed in autumn; in mid-early varieties and lines 1.15 and 0.95, respectively, and in mid-late ones 1.48 and 1.22. These data indicate of a significant influence of forecrops and duration of spring common wheat growing period on the kernel-producing capacity of the spike. It has been established that sowing dates have a considerable influence as well: an early sowing date increases the kernel-producing capacity of the spike on fallow and on a grain forecrop more than a late sowing date does.