The experiment was carried out at the research field of the Department of Crop Science and Technology, Rajshahi University, Rajshahi during the period from October, 2023 to March, 2024. The aim of this research was to evaluate the excellent combination of these two parameters, as the nutrients and moisture are two major components that drastically affect mustard production. The experiment consisted of three levels of chemical fertilizers i.e. F1 (80-20-30 kg/ha NPK), F2 (90-30-40-25-1.0 kg/ha NPKSB), F3 (100-40-50-35-1.5 kg/ha NPKSB) and the three levels of irrigations viz. I0 (no irrigation), I1 (two irrigation at 20 and 50 DAS), I2 (three irrigation at 20, 40 and 50 DAS). BARI Sarisha-14 was used as test crop of this research. The most comprehensive combined treatment F3I2 resulted in the maximum observed values of plant such as plant height (83.67 cm), number of leaves per plant (19.33), number of branches per plant (10.00), minimum days to 50% flowering (35.00), minimum days to maturity (75.00), siliqua length (5.03), number of siliqua per plant (100.33), number of seeds per siliqua (25.33), 1000 seeds weight (3.79 gm). This treatment also resulted in highest seed yield (1.59 t/ha), indicating a robust growth response. In contrast, the lowest values of all plant characters and seed yield (1.44 t/ha) except days to 50% flowering and maturity under the combined treatment F1I0. However, application of three irrigations with 100-40-50-35-1.5 kg/ha NPKSB may be practiced for achieving higher seed yield of mustard (BARI Sarisha-14) in the northern part of Bangladesh.
Key words: Chemical fertilizer, irrigation, growth and yield, mustard.
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