Author(s):

Jawahar S, Neeru Jain, SR Vinod Kumar, C Kalaiyarasan, K Arivukkarasu, S Ramesh and K Suseendran

Abstract: Field experiments were conducted during Navarai (January to April 2017) and Samba (September 2017-January 2018) seasons at Annamalai University Experimental Farm, Annamalai Nagar, Tamilnadu, India to study the effect of silicon sources on blast incidence in low land rice. The treatments comprised of 100 % Recommended Dose of Fertilizers (RDF) (T₁), T₁ + Calcium silicate @ 2 t ha^-1 (T₂), T₁ + 120 kg Si ha^-1 through Fly ash (T₃), T₁ + Silixol granules @ 25 kg ha^-1 (T₄), T₁ + Silixol granules @ 50 kg ha^-1 (T₅), T₁ + Foliar application of Silixol plus @ 500 ml ha^-1 on 20, 40 and 60 DAT (T₆), 75 % Recommended Dose of Fertilizers (RDF) (T₇), T₇ + Calcium silicate @ 2 t ha^-1 (T₈), T₇ + 120 kg Si ha^-1 through Fly ash (T₉), T₇ + Silixol granules @ 25 kg ha^-1 (T₁₀), T₇ + Silixol granules @ 50 kg ha^-1 (T₁₁), T₇ + Foliar application of Silixol plus @ 500 ml ha^-1 on 20, 40 and 60 DAT (T₁₂). The experiments were laid out in randomized block design with three replications. Among the treatments tried, T₅ (100% RDF + Silixol granules @ 50 kg ha^-1) considerably reduced the blast incidence (0.40, 1.44 and 0.36, 1.15) in rice at tillering and flowering stages in both seasons. While, T₇ (75 % RDF alone) had least defense on rice leaf blast which recorded higher per cent incidence in both seasons. Thus it can be concluded that soil application of silixol granules @ 50 kg ha^-1 along with 100% NPK and recommended plant protection measures holds immense potentiality to reduce the blast incidence at tillering and flowering stages in low land rice.

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