IMPACT OF INTEGRATED INORGANIC AND ORGANIC FERTILIZER MANAGEMENT ON GROWTH, YIELD, AND YIELD ATTRIBUTES OF INDIAN MUSTARD (BRASSICA JUNCEA L.) UNDER DEHRADUN (INDIA) CONDITIONS

A key oilseed crop that is extensively grown in India during the Rabi season, Indian mustard (Brassica juncea L.) is essential to the manufacture of edible oil. To maximize mustard development and output, nutrient control is essential, particularly for nitrogen (N), phosphorus (P), potassium (K), and sulfur (S). This study assessed how Indian mustard growth metrics, yield characteristics, and seed production were affected by integrated nutrient management (INM) using inorganic fertilizers, vermicompost, and biofertilizers (Azotobacter + PSB) under the Dehradun agroclimatic conditions. Using a Randomized Block Design, nine treatment combinations comprising different dosages of prescribed fertilizers (RDF), vermicompost, and biofertilizers were used in a field experiment carried out during the Rabi season of 2023–2024. At various stages of growth, growth metrics such plant height, population, and dry matter accumulation were measured. Additionally, evaluated were yield parameters such as test weight, seed yield, siliqua length, siliqua number per plant, and seeds per siliqua. When compared to using only organic or inorganic fertilizer, the results demonstrated that integrated treatments greatly increased growth and production. The treatment that combined 80% RDF + vermicompost (9 kg) + biofertilizers (T4) consistently produced the highest seed yield (22.70 q ha- ¹), siliqua quantity (242.4 per plant), seeds per siliqua (14.62), and superior plant height (58.84 cm at 30 DAS). Furthermore, T4 displayed the highest biological and stover production, suggesting better biomass buildup. The 80% RDF + vermicompost (T2) group had the greatest harvest index, indicating effective assimilate partitioning. The results demonstrate that integrated nutrient management improves crop yield, soil health, and nutrient usage efficiency, providing a sustainable and profitable method of growing mustard in Dehradun and other agro-ecological zones.