Why Is Ferrous Sulfate Monohydrate a Preferred Iron Source for Agriculture, Feed, and Industry?

Technical Introduction

Ferrous sulfate monohydrate (FeSO₄·H₂O) is a white to light green crystalline powder that contains 30–32% elemental iron, making it a more concentrated form compared to ferrous sulfate heptahydrate.
It dissolves readily in water, releasing ferrous ions (Fe²⁺) that plants and animals can easily absorb.
It is widely applied in crop micronutrient supplementation, animal feed fortification, and industrial processes.

Applications

1. Agriculture

• Micronutrient Fertilizer: Corrects iron chlorosis, improving chlorophyll synthesis and plant vigor.

• Soil Acidifier: Helps reduce soil alkalinity, enhancing nutrient uptake.

• Moss Control: Used in turf management to suppress moss growth.

2. Animal Feed

• Feed Additive: Prevents iron-deficiency anemia in livestock and poultry by supplying bioavailable iron.

3. Water Treatment

• Coagulant Aid: Improves solid-liquid separation in wastewater.

• Hydrogen Sulfide Control: Reduces odor formation in sewage systems.

4. Industrial Uses

• Cement Additive: Reduces toxic hexavalent chromium to harmless trivalent chromium.

• Pigment Production: Serves as a raw material for iron oxide pigments.

Advantages

• High Iron Content: Over 30% Fe, more efficient than heptahydrate.

• Lower Transportation Costs: Higher active content means less weight per unit of iron.

• Fast Solubility: Provides rapid nutrient availability.

• Multiple Sectors: Suitable for agriculture, feed, water treatment, and manufacturing.

Typical Parameters

FAQs

Q1: What is the difference between monohydrate and heptahydrate forms?
A1: Monohydrate contains less water and more iron per unit weight, making it more concentrated and cost-efficient.

Q2: Can it be applied directly to leaves?
A2: Yes, but foliar sprays should be well-diluted to avoid leaf burn.

Q3: Does it mix with other fertilizers?
A3: It is compatible with most fertilizers except alkaline products.

Q4: Is it safe for animal feed?
A4: Yes, within regulated inclusion rates. Overdosing may cause toxicity.

Q5: How should it be stored?
A5: Keep dry and sealed to avoid oxidation into ferric compounds.