Impact of Black Soldier Fly Larval Frass on Growth and Yield of Cluster Bean (Cyamopsis tetragonoloba L.)

Hermetia illucens L., commonly known as the Black Soldier Fly (BSF), has garnered global attention for its role in insect farming due to its efficient conversion of organic waste into nutrient-rich larval biomass, with frass as a primary byproduct. This study aimed to explore the potential of BSF larval frass (BSFF) as an organic fertilizer for agricultural production, especially evaluating its performance compared to vermicompost on cluster bean growth and yield under field conditions during rabi season at Rajendranagar, Hyderabad. Using a completely randomized block design with eight treatments, various growth parameters such as plant height, number of branches plant-1 and dry matter production, along with yield attributes including number of clusters plant-1, number of pods cluster-1, number of pods plant-1, pod weight (g), pod yield plant-1 and yield (t ha-1) were assessed. Significant differences were observed among treatments, the highest growth and yield parameters were recorded in application of 25 % N through BSF frass + 75 % RDN (T5) and it was on par with 25 % N through vermicompost + 75 % RDN (T6), 50 % N through BSF frass + 50 % RDN (T7), 50 % N through vermicompost + 50 % RDN (T8) and RDF (T2) compared to 100 % N through BSF frass (T3), 100 % N through vermicompost (T4) and control (T1).These treatments resulted in yield increase of 35.7 % (T5), 24.7 % (T6), 23.4 % (T7), 22 %(T8) and 24.36 % (T2) respectively, compared to the control. These findings indicated that BSF larval frass holds promise as a sustainable alternative to vermicompost for enhancing cluster bean production, offering potential benefits for agricultural sustainability and organic waste management.