Nanotechnology has been exploited for wide range of applicants in natural science, medicine and engineering, but its role in agricultural sciences is yet to be fully explored. Research revealed that mixtures of nano-SiO₂ and nano-TiO₂ increases nitrate reductase in soybean increasing its germination and growth (Lu et al., 2002). Globally, wheat is an important crop because of it contributes nourishment of 36 per cent population, facing tremendous pressure to increase their productivity. Fertilizer response augmentation may be one of the factors to increase the productivity of wheat. It is hypothesise in this experiment that nanoparticles may augment the response of fertilizer. Considering the above, this experiment was planned and executed with an objective to screen the concentration of nano TiO₂ and their suitability with major plant nutrients i.e NPK in Wheat crop. A field experiment was conducted during rabi season of 2011-12 at N. E. Bourlag Crop Research Centre of Govind Ballabh Pant University of Agriculture & Technology, Pantnagar (Uttarakhand). The soil of the experimental site was sandy loam in texture, medium in organic carbon (0.74%), available nitrogen (213.24 kg/ha), available phosphorus (24.14 kg/ha) and available potassium (137.08 kg/ha), with near neutral soil reaction (pH 7.5). Combination of four NPK levels ( No NPK, Rec. NPK, Rec. NP and Rec. NK) and four nano-TiO₂ concentrations ( No nano-TiO₂ , 0.02, 0.04 and 0.06 per cent nano-TiO₂) was tested under Factorial Randomized Block Design with three replication. The recommended level of NPK was 150:60:40 and Nano TiO2 was applied at two wheat growth stage i.e maximum tillering stage and booting stage. The wheat variety UP-2572 was sown at 20 cm row spacing @ 125 kg seed rate per ha. The standard practices were followed to raise the wheat crop. Results revealed that, wheat yield differed significantly due to different treatments. Recommended NPK with 0.06 per cent nano-TiO₂ produced maximum grain yield (6.52 Mg/ha), biological yield (13.68 Mg/ha), tillers per square meter, dry matter accumulation and yield attributes viz. 1000 grain weight. Wheat took relatively more time to reach 50 per cent heading and maturity in recommended NPK with 0.06 per cent nano-TiO₂. However, 0.04 per cent of TiO₂, was found to give maximum value of above said parameters, if P or K was omitted. Therefore, it can be concluded from this experiment that recommended NPK at 0.06 per cent nano-TiO₂, recommended NP and NK at 0.04 per cent nano-TiO₂ found best in terms of wheat yield and growth.

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