Impact of Zinc and Boron on the Growth, Yield and Economic Performance of Linseed: A Review

Abstract

Introduction: Linseed (Linum usitatissimum L.) is an important oilseed crop grown in India, primarily on marginal lands with minimal inputs, leading to low productivity. Micronutrients like zinc and boron play a crucial role in enhancing growth, yield, and oil content. Objective: This review evaluates the effect of zinc and boron supplementation on linseed growth, yield attributes, and oil quality, highlighting effective nutrient management strategies. Methodology: The review compiles findings from various studies examining the soil and foliar application of zinc and boron, their impact on growth parameters, seed yield, oil content, and nutrient uptake in linseed cultivation. Key Findings: Zinc is essential for enzyme activation, chlorophyll formation, and grain filling, while boron supports pollen viability, seed setting, and nutrient transport. Studies indicate that foliar application of ZnSO₄ (0.5%) and borax (0.3%) at 45 DAS significantly enhances seed yield, oil percentage, and stover yield. Additionally, zinc application improves root development, biomass accumulation, and photosynthetic efficiency, while boron enhances flower retention, pod formation, and carbohydrate metabolism. Synergistic effects of zinc and boron improve nutrient uptake, seed weight, and oil composition by increasing the proportion of unsaturated fatty acids. Proper timing and method of micronutrient application enhance overall crop resilience to environmental stress, leading to better nutrient use efficiency and economic returns for farmers. Conclusion: Zinc and boron play a critical role in optimizing linseed production. Targeted foliar application at key growth stages can enhance yield and oil quality. Future research should focus on site-specific nutrient strategies for sustainable linseed cultivation.