Influence of different soil tillage methods on the development of root rot in spring wheat

Abstract The study was carried out in the grain-fallow-hoed crop rotation in the stationary field experience of the Minderlinskoe academic and experimental facility of Krasnoyarsk State Agrarian University. A positive effect of green manure rapeseed fallow on the phytosanitary condition of the spring wheat crops in the traditional moldboard ploughing by 20-22 cm was found: the root rot rate declines by 8.2-10.9% compared to the absence of any soil tillage. The best conditions for the growth and tillering were identified in the variant when the wheat was preceded by green manure rapeseed fallow with the soil ploughed by 20-22 cm; this variant provided the largest crop yield from 1 ha. The paper presents the mycoflora analysis of the daughter seeds of the Novosibirskaya-15 spring wheat cultivated on the soil tilled with different methods. The study showed that the mycoflora of the daughter seeds of the Novosibirskaya-15 spring wheat cultivated on the soil tilled with different methods is mostly represented by Fusarium sp., p. Alternaria sp., Bipolaris sp., Penicillium sp. The plant pathogenic fungi of Alternaria sp. was found to dominate in all the variants of the experiment. Statistic significance of the difference (p<0.001) between the experiment variants in the intensiveness and prevalence of the disease has been found. The greatest disease development index was found in the spring wheat cultivated without basic soil tillage, and the smallest index was demonstrated by the variant with the moldboard ploughed soil (20-22 cm).