author(s)
Bojan A, B Gopu, V Gopi and R Angelin Silviya

abstract
The study of standardization of organic amendments for dragon fruit (Selenicereus undatus) cultivation under Chengalpattu conditions this research was conducted at the farmer field at Vadamanipakkam Village on Chengalpattu district, Tamil Nadu during 2024-2025, the experiment trail have been conducted in RBD with 3 replication using 9 different treatments viz., T₁ = Control, T₂ = 100 per cent N through poultry manure, T₃ = 100 per cent N through poultry manure + AM fungi @ 25 g/pillar, T₄ = 100 per cent N through poultry manure + PSB @ 10 ml/pillar, T₅ = 100 per cent N through poultry manure + AM fungi @ 25 g/pillar + PSB @ 10 ml/pillar, T₆ = 100 per cent N through vermicompost, T₇ = 100 per cent N through vermicompost + AM fungi @ 25 g/pillar, T₈ = 100 per cent N through vermicompost + PSB @ 10 ml/pillar, T₉ = 100 per cent N through vermicompost + AM fungi @ 25 g/pillar + PSB @ 10 ml/pillar. Among all treatments, the combination of 100 per cent N through poultry manure + AM fungi @ 25 g/pillar + PSB @ 10 ml/pillar (T₅) consistently recorded superior results in new shoot length, areole distance, new branches per pillar, flower length, and yield per pillar.