Effect of soil treatments with silica-rich lime fertilizers and sodium trisilicate on the incidence of wheat by Erysiphe graminis and Septoria nodorum depending on the form of N-fertilizer
1989
Leusch, H.-J. (Bonn Univ. (Germany, F.R.). Inst. fuer Pflanzenkrankheiten) | Buchenauer, H.
In pot trials, the effect of soil treatments with silicon-rich materials on the incidence of Erysiphe graminis and Septoria nodorum on wheat was studied - Soil treatments with sodium trisilicate and blast furnace lime significantly reduced powdery mildew incidence of wheat and increased yields. - The incidence of powdery mildew on leaves and glumes decreased as the Si O2-contents in the dry matter increased. - Si O2-contents of about 1 per cent of the dry matter at the time of inoculation proved to be sufficient to protect plants against powdery mildew attack. - The effect of high Si O2-contents against powdery mildew is based on the inhibition of penetration. The development of powdery mildew was retarded on plants with high silicon contents. Growth of hyphae was decelerated and conidia formation started delayed. - Control of Septoria nodorum was attained only following soil treatment with sodium trisilicate and under environmental conditions that were unfavourable for the develoment of the disease. - By using (NH4)2SO4 instead of Ca(NO3)2, the availability of the silicic acid of the blast furnace lime was improved and the Si-uptake and, consequently, the efficacy against powdery mildew was increased. The effect of ammonium sulphate is based on its acidic properties. By lowering the pH-values of the soil due to nitrification and SO4 of ammonium sulphate, silicic acid is released from the lime fertilizer and becomes available for root uptake by the plants
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