Integrated nutrient management for sustainable cultivation of okra (Abelmoschus esculentus L.) in northern Ganges River floodplain soils of Bangladesh

Diminution of land and a decline in soil health with fertility due to intensive agricultural practices are the limiting factors for sub-tropical agriculture. Therefore, Integrated Nutrient Management (INM) is an option to fight against traditional farming practices by improving crop yields and managing soil fertility status for long-term sustainability through the combined and careful use of all possible sources of plant nutrients. This study, aimed to investigate the effects of INM tactics to maximize the vegetative and reproductive qualities of Okra under sub-tropical conditions. The entire study was performed in a pot experiment where replications were thrice with 12 INM treatments arranged in a completely randomized design. The results of our investigation revealed that combined application of inorganic fertilizer (75% recommended doses of NPK fertilizer) and 25% organic fertilizer (Compost + Vermicompost + Trichocompost). T9 significantly enhanced the growth of okra plants at different stages as expressed in terms of numbers of flowers, fruits, average fruit weight, 100 seed weight and yield plant-1. We also tested the physiochemical properties of the soil before planting and after the harvesting period. Profitability analysis was performed considering only the variable production costs. Our results suggest that the judicious combination of organic and synthetic fertilizers was more sustainable and productive than other studied treatments.