A study on custard apples found that using a combination of fertilizers and biofertilizers led to better fruit set, higher yields, and improved fruit quality. The treatment with 100% RDF, FYM, Azotobacter, and PSB resulted in the highest number of flowers, fruits, and fruit set percentage. This treatment also produced the most fruits per plant, highest yield per tree, and best marketable yield. Additionally, it had the highest fruit weight and best biochemical attributes like total soluble solids, reducing sugar, non-reducing sugar, total sugars, ascorbic acid, and acidity levels. The control treatment had the lowest values for all these parameters.