Effect of nano-DAP and nano-urea on Karonda (Carissa carandas L.) grafts Cv. Konkan Bold

This study aimed to determine the effect of application of foliar spray and drenching of nano-DAP and nano urea on growth and survival of karonda grafts cv. Konkan Bold. The experiment was laid out in Randomized Block Design with two replication and fifteen treatments to assess various concentrations of nano DAP and nano urea at college of horticulture, Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli, Ratnagiri, Maharashtra, India. Treatments applied as a foliar spray and drenching of nano-DAP and nano urea at different rates in which drenching of nano urea at 2000 ppm showed best performance in survival (100%), graft height (52.31 cm), number of leaves (46.00), leaf area (280.84 cm²), Girth of graft (8.20 mm), fresh and dry weight of shoot (27.00 g and 8.50 g) and also T₁₄ (drenching of nano-DAP at 2000 ppm) had shown best performance in, fresh and dry weight of root (25.91 g and 8.50 g), length of tap root (30.25 cm). Treatment–T₁₃ showed maximum B:C ratio (1.10) and followed by treatment T₁₅ and T₁₁ reported with B:C ratio (1.09). Among all the nano-DAP and nano urea treatments drenching of nano urea at 2000 ppm was best to highest survival and better growth of karonda grafts cv. Konkan bold and also T₁₃- drenching of nano urea 1500 ppm also at par with the best treatment and give maximum B:C ratio.