The study was conducted to know the impact of different levels of customized fertilizers on V1 mulberry under irrigated condition. An experiment was conducted during rainy season at college of Sericulture, Chintamani, UAS (B) in established irrigated V1 mulberry garden with spacing of 90 x 90 cm. The different levels of customized fertilizers were applied in one dose. The pooled data of two crops revealed that mulberry raised with 150 per cent nutrients through customized fertilizers (T6) recorded significantly maximum plant height, highest number of shoots per plant and produced more number of leaves per plant on 45th and 75th day after pruning. Leaf yield per plant and leaf dry matter per plant was maximum in T6 (533.93 g/plant and 194.26 g/plant). However, these parameters were lowest in control plots (T1). Intern the response of silkworm, Bombyx mori (PM x CSR2), to the application of different types of customized fertilizers showed positive influence on silkworm rearing during late age registered significantly shorter fifth instar larval durations (170.00 h), total larval duration (600.66 h) and maximum ERR (96.00 %) per cent, cocoon weight per 50 cocoons (80.91 g/50 cocoons) and number per 50 worms (49.00 cocoons/50 worms) were recorded in 150 % customized fertilizer treatment. Among the cocoon parameters, the maximum single cocoon weight (1.98 g), single shell weight (0.36 g), single pupal weight (1.87 g), and shell percentage (19.12 %), respectively were evidential when silkworm fed on mulberry raised by 150 per cent nutrients through customized fertilizers and they were statistically on par with 125% and 100% customized fertilizer treatment over other treatments.