Vol. 10, Issue 12 (2021)

Author(s):
Dr. A Subbiah, S Saraswathy and N Nireshkumar

Abstract:
An experiment was carried out to elucidate the effect of biofertilizers (Azospirillum and Phosphobacteria) and CSR-BIO alone and their combination on growth parameters of dogridge (Vitis X champini) rootstock at Grapes Research Station, Anaimalayanpatty, Tamil Nadu, India. The experiment was conducted in completely randomized design (CRD) with 16 treatments (T₁ (Azospirillum 1 g / polybag)_, T₂ (Azospirillum 2 g/ polybag), T₃ (Phosphobacteria 1 g/ polybag), T₄ (Phosphobacteria 2 g / polybag), T₅ (CSR- BIO 1 g / polybag)_, T₆ (CSR- BIO 2 g / polybag)_, T₇ (T₁ + T₃+ T₅), T₈ (T₁ + T₃+ T₆), T₉ (T₁ + T₂+ T₅), T₁₀ (T₁ + T₄+ T₆), T₁₁ (T₂ + T₃+ T₅), T₁₂ (T₂ + T₃+ T₆), T₁₃ (T₂ + T₄+ T₅), T₁₄ (T₂ + T₄+ T₆), T₁₅ (with IBA dipping) and T₁₆ (without IBA dipping)) and three replications. The data revealed that T₁₄ (Azospirillum 2 g + Phosphobacteria 2 g + CSR- BIO 2 g/ polybag) showed the highest values for sprouting per cent (96.67), survival per cent (95.00), stem diameter (2.35 mm), fresh weight of shoot (5.09 g), fresh weight of root (1.82 g), number of primary roots (6.50) and shoot/root ratio (2.80). The same treatment T₁₄ (Azospirillum 2 g + Phosphobacteria 2 g + CSR- BIO 2 g/ polybag) also expressed the highest number of leaves cutting^-1 (18.13), shoot length (27.56 cm) and root length (35.15 cm). While control (T₁₆) recorded the lowest values for all growth parameters.