Author(s):

R Dhanasekarapandian and N Kumarasamy

Abstract: A field experiment was conducted in clay loam soil belonging to <em>Kondal</em> series (Vertisols- <em>Typic Haplusterts</em>) during 2017 with an objective of studying the effect of foliar and soil application of silicon on growth, yield, nutrient uptake and their availability in rice var. <em>ADT 43</em>. The treatments consisted of T₁- Control- (RDF 120:32:32 N, P₂O₅, K₂O kg ha^-1), T₂- 2 ml L^-1 Si, T₃- 4 ml L^-1 Si and T₄- 8 ml L^-1 Si, T₅-1.63 kg available Si ha^-1 (5 t LFA ha^-1), T₆ - 3.26 kg available Si ha^-1 (10 t LFA ha^-1), T₇ - 4.89 kg available Si ha^-1 (15 t LFA ha^-1), T₈- 1.63 kg available Si ha^-1 (5 t LFA ha^-1) + T₄, T₉ - 3.26 kg available Si ha^-1 (10 t LFA ha^-1) + T₃ and T₁₀ - 4.89 kg available Si ha^-1 (15 t LFA ha^-1) + T₂. All the treatments received uniform dose of NPK (120:32:32 N: P₂O₅: K₂O kg ha^-1). The treatments T₂, T₃, T₄ received foliar spray of silicon, T₅, T₆, T₇received soil application of silicon and T₈, T₉, T₁₀received foliar plus soil application of silicon. The results revealed the positive and significant performance of rice to foliar, soil application of silicon and their combinations in terms of growth, yield, nutrient uptake and availability over control. The impact of treatments on the performance of rice was high and well pronounced when foliar spray of silicon supplied through a formulation named OSABBB was resorted compared to soil application of silicon through lignite fly ash (LFA) and their combinations. The highest uptake and availability of nutrients was again noticed in T₄(Foliar spray of silicon @ 8 ml L^-1 + RDF) which was comparable with T₃ (Foliar spray of silicon @ 4 ml L^-1 + RDF) and T₂ (Foliar spray of silicon @ 2 ml L^-1 + RDF).Soilapplicationandfoliar spray of silicon was comparable with foliar spray of silicon @ 2 ml L^-1 for certain parameters. When the effect of treatments on the performance of rice was compartmentalized, it was clearly expressed that on an average the foliar spray of silicon caused 18.4 per cent increase followed by foliar + soil application (15.4%) and soil application (10.3 %) over control.

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