REDUCTION OF ROOT ROT HARMFUL EFFECT BY AGROBACKGROUND AND SEED TREATMENT

Abstract

There were assessed agrobackgrounds in spring wheat cultivation and wheat seed treatment in reducing harmful effect of root rot and rising yields. Recordings and observations were performed in the experimental field of the Irkutsk Research Institute of Agriculture, Irkutsk Region. Agrobackgrounds (liming, N30P30K30-compound and seed treatment with Vial Trust 0.4 l/t) were studied against the background of green manuring in a field sod-based rotation in 2013-2014. The total affection of untreated wheat seeds was 76.7% on the average for the two years. Liming and fertilization contributed to small growth in root rot propagation, e.g. by 8.2% during the phase of wheat seedlings when limed, by 2.7% when used N30P30K30-compound against the background without liming, and by 1.8% when combined with liming. Seed treatment reduced root rot propagation during the phase of seedlings in comparison to variants without treatment against different backgrounds. Without liming and fertilization, this reduction reached 9.9%, against the background of N30P30K30-compound 6.6%; in the variant with liming without fertilization 7.4%, against the background of N30P30K30-compound 2.7%. The same tendency was seen during the later phases of wheat development. The statistically significant increase in yield was obtained in the variants of fertilization + seed treatment (1.10 t/ha), liming + fertilization (1.13 t/ha), and with complex application of liming, fertilization and seed treatment (1.26 t/ha).