Effects of different nutrient sources on seed germination and early growth of cluster bean (Cyamopsis tetragonoloba (L.) Taub.) and brinjal (Solanum melonjena L.)

The population and food demand are growing at the same rate. Properly applying fertilizers is important to this endeavor, as it is critical in increasing growth, yields, and quality. The filter paper seed germination bioassay will serve as a better alternative to study the direct impact of fertilizers on seed germination because, in soil or culture medium-based studies, various other factors also influence germination and growth. The present study investigated the effect of seven different fertilizers: mineral (Urea, DAP, and combined NPK), organic (Vermicompost + Poultry, Pond slurry, Farmyard manure), and organomineral (Pond slurry + Poultry + Mineral) having four different concentrations (110, 220, 330, 440 mg/L) on seed germination and seedling growth of brinjal and cluster bean while the double distilled water served as blank. Various parameters were recorded, such as the seedling's relative germination ratio, shoot length, root length, fresh weight, and dry weight. Among different fertilizers, organic fertilizers give the best-suited results at 440 mg/L, while mineral fertilizers above 110 mg/L inhibited germination and seedling growth. The best-suited fertilizer combination was organomineral, with a concentration of 220 mg/L. Furthermore, regression analysis depicted a stronger correlation between growth parameters and the N, P, and K content of different fertilizers. This study suggests that higher doses of fertilizers sometimes leads to inhibition of growth and yield. Additionally, organomineral fertilizer served as better alternative because they blend both organic and inorganic nutrients.