INTRODUCTION
Iron sulphate fertilizers are widely used micronutrient fertilizers applied to correct iron deficiency in crops and to improve soil properties. Iron (Fe) is an essential element for chlorophyll synthesis, enzyme activity, and overall plant metabolism. Iron sulphate (FeSO₄) is one of the most common and economical iron sources used in agriculture due to its availability, effectiveness, and versatility.
ROLE OF IRON IN PLANT NUTRITION
Iron fertilizers play a critical role in plant physiological processes.
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Essential for chlorophyll formation
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Activates enzymatic reactions
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Supports respiration and photosynthesis
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Contributes to nitrogen metabolism
Iron deficiency results in chlorosis, especially in young leaves, and reduced crop productivity.
WHAT IS IRON SULPHATE FERTILIZER
Iron sulphate fertilizer is an inorganic iron salt commonly available in ferrous sulphate form.
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Chemical name: Ferrous sulphate
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Chemical formula: FeSO₄
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Physical form: Greenish crystalline powder or granules
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Solubility: High water solubility
It is used both as a fertilizer and as a soil amendment.
TYPES OF IRON SULPHATE FERTILIZERS
FERROUS SULPHATE MONOHYDRATE
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Higher iron concentration
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Faster dissolution
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Suitable for fertigation and foliar use
FERROUS SULPHATE HEPTAHYDRATE
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Widely available and cost-effective
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Commonly used in soil application
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Improves soil acidity
BENEFITS OF IRON SULPHATE FERTILIZERS
Iron sulphate fertilizers offer multiple agronomic advantages.
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Corrects iron chlorosis
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Improves leaf color and photosynthesis
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Enhances crop vigor
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Helps lower soil pH in alkaline soils
APPLICATION METHODS OF IRON SULPHATE FERTILIZERS
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Soil application
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Foliar spray application
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Fertigation systems
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Compost enrichment
Foliar application provides rapid correction, while soil application offers longer-term benefits.
LIMITATIONS OF IRON SULPHATE FERTILIZERS
Despite their benefits, iron sulphate fertilizers have certain limitations.
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Reduced efficiency in high-pH soils
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Rapid oxidation of iron in soil
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Short-term availability compared to chelated iron
In alkaline soils, chelated iron fertilizers may be more effective.
IRON SULPHATE VS CHELATED IRON FERTILIZERS
Iron sulphate fertilizers are economical and effective under suitable soil conditions, while chelated iron fertilizers provide higher stability and availability across wider pH ranges. Selection depends on soil type, crop sensitivity, and management practices.
SUMMARY
Iron sulphate fertilizers are essential micronutrient fertilizers used to correct iron deficiency, enhance chlorophyll production, and improve plant health. When applied correctly, they provide an effective and economical solution for iron nutrition, especially in acidic to neutral soils.
