PJB-2025-145
Unraveling Interactive Effect of Zinc and Phosphorus Application on Growth, Yield, and Quality Attributes of Onion
Hafiz Mohkum Hammad
Abstract
The onion is a crucial vegetable that is widely utilized in households. The onion bulb boasts a rich composition of vitamins, minerals, and carbohydrates. However, imbalanced fertilization, particularly concerning phosphorus (P) and zinc (Zn), poses a significant challenge to sustainable onion production and quality. Notably, these two nutrients exhibit an antagonistic effect within the plant. This study aims to unravel the interactive effects of P and Zn, seeking optimal levels to enhance onion yield and quality traits. Therefore, the current study was conducted to check interactive effect of three Zn doses (5, 10, and 15 kg Zn ha-1) and five P doses (75, 100, 125, 150, and 175 kg P ha-1) on onion. Results indicated that the combined application of 10 kg Zn ha-1 with 150 kg P ha-1 yielded superior outcomes, including increased leaf length (39.3 cm), plant height (58.3 cm), leaf width (1.54 cm), leaf density (8.89 plant-1), number of rings (10.3 rings bulb-1), and onion yield (26.5 ton ha-1). Furthermore, simultaneous application demonstrated the highest Zn and P concentrations in leaves (0.31 mg kg-1 and 2.06 mg kg-1, respectively) and bulbs (0.33 mg kg-1 and 2.34 mg kg-1, respectively). Furthermore, application of Zn and P also significantly affected bulbs skin color and foliage color. The findings of this study conclude that the simultaneous application of 10 kg Zn ha-1 and 150 kg P ha-1 is the best management practice for onion farmers to achieve higher growth, yield, and quality traits in onions.
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