Manganese Sulphate Pure (Spray)
Manganese Sulphate Pure (Spray)
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Description:
🌱 Uses of Manganese Sulphate in Agriculture
Manganese Sulphate is an essential agricultural micronutrient fertilizer used to correct manganese deficiencies in soil and plants. It supplies manganese (Mn²⁺) in a soluble, plant-available form. Manganese plays several crucial physiological roles in crop development, yield, and quality.
✅ 1. Corrects Manganese Deficiency in Soil & Plants
Primary Use:
The most common use of manganese sulphate is to treat manganese deficiency in soils and crops. Deficiency symptoms include:
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Interveinal chlorosis (yellowing between leaf veins)
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Reduced root growth
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Stunted plant growth
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Poor fruit set or grain formation
Common in: Alkaline, sandy, organic-rich, or over-limed soils, where Mn becomes insoluble and unavailable to plants.
MnSO₄ is highly effective because it is highly water-soluble and rapidly absorbed by plant roots and leaves.
🧬 2. Key Role in Plant Metabolic Functions
Manganese is a cofactor for several enzymes. It plays a crucial role in:
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Photosynthesis: It is involved in photolysis of water (splitting water) during photosynthesis.
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Chlorophyll synthesis: Essential for leaf greenness.
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Nitrogen metabolism: Assists in nitrogen assimilation and protein synthesis.
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Carbohydrate metabolism: Helps in sugar transport and storage.
Without manganese, these metabolic functions are impaired, leading to significant yield loss.
🍀 3. Enhances Disease Resistance and Stress Tolerance
Manganese strengthens plant cell walls by promoting lignin synthesis. This makes plants:
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More resistant to fungal and bacterial pathogens
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Better able to handle abiotic stress like drought and salinity
Example: In wheat, adequate Mn helps prevent take-all root rot. In citrus, it reduces gummosis susceptibility.
🌾 4. Improves Crop Yield and Quality
Manganese sulphate contributes to:
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Improved grain filling in cereals
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Better fruit size and sweetness in fruits
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Uniform vegetative growth
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Early maturity and flowering
Manganese deficiency during early stages often leads to poor root growth and weak plant structure, directly impacting final yield.
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DOSAGE:
💧 1. Hydroponics / Constant-Feed Systems
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Stock Solution:
Dissolve 0.9–1 g of Manganese Sulphate per litre of water to create a concentrated solution. -
Working Dosage:
Use 2.5 mL of stock solution per litre of nutrient solution to achieve 1.5 ppm Mn in hydroponic systems. -
Application Frequency:
Continuous feeding or weekly replenishment depending on system type.
🌿 2. Foliar Spray Application
| Severity of Deficiency | Dosage (per 100 Litres water) | Equivalent MnSO₄ (g/L) |
|---|---|---|
| Preventive / Mild | 1 lb = 454 g | ~4.5 g/L |
| Moderate | 2 lb = 908 g | ~9 g/L |
| Severe | 3 lb = 1.36 kg | ~13.5 g/L |
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Timing: Spray during early vegetative growth or immediately upon noticing deficiency symptoms.
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Spray Volume: 200–300 L/acre (depending on crop canopy).
🌾 3. Soil Application Dosage (Broadcast or Band)
| Application Type | Dosage per Acre | Dosage per Hectare |
|---|---|---|
| Broadcast | 20–60 lb (9–27 kg) | 22–66 kg MnSO₄/ha |
| Band / Side-dress | 10–30 lb (4.5–13.6 kg) | 11–33 kg MnSO₄/ha |
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Incorporate into soil before or at planting for best availability.
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For alkaline soils, use the higher end of the range or the foliar route.
🍊 4. Crop-Wise Application Guide
| Crop | Application Type | Rate & Timing |
|---|---|---|
| Cereals (Wheat, Barley, Maize) | Foliar Spray | 5–9 kg MnSO₄/ha in 200–300 L water at tillering (GS21) or early growth |
| Soil Application | 25–30 kg/ha MnSO₄ pre-planting | |
| Soybean / Pulses | Foliar Spray | 5 kg MnSO₄/ha at early vegetative stage |
| Vegetables (Leafy, Tomato, Brinjal) | Foliar Spray | 4.5–9 g/L or 1–2 lb/100 gal; repeat after 10–15 days if needed |
| Soil Application | 20–25 kg/ha before transplanting | |
| Cotton / Sugarcane | Foliar Spray | 5–6 kg MnSO₄/ha in 250 L water after 45–60 days of planting |
| Banana / Papaya | Foliar Spray | 5 kg/ha every 45–60 days during growth |
| Citrus Trees | Foliar Spray | 3–5 lb MnSO₄ per acre in spring/summer |
| Soil Application | 22–32 kg MnSO₄/acre once annually | |
| Grapes / Pomegranate | Foliar Spray | 5–7 kg/ha in 200 L water before flowering and fruit setting |
🧪 5. Ideal Manganese Levels for Crops
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Leaf Tissue Sufficiency: 20–200 ppm
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Deficiency Level: < 20 ppm
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Soil Mn Level:
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Deficient if < 3–10 ppm (DTPA extractable)
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Optimum: 10–50 ppm
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⚠️ 6. Important Usage Notes
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Always check soil pH. High pH (>6.5) soils tie up manganese; foliar application is preferred in such cases.
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Avoid overuse – manganese toxicity can occur, especially in acidic soils.
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Use clean water for foliar applications to prevent clogging and leaf burn.
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Compatible with most fertilizers and pesticides, but do a jar test before mixing.
📘 7. Conversion Reference
| Unit | Equivalent |
|---|---|
| 1 ppm | 1 mg/L (in liquid) or 1 mg/kg (in solid) |
| 1 lb | 0.45 kg |
| 1 acre | 0.405 hectares |
| Mn Content in MnSO₄ | ~31.8% |
🧑🌾 Consultation Note
Before applying manganese sulphate:
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📋 Always perform a soil and leaf tissue analysis to determine actual Mn deficiency levels.
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🧪 Choose application method based on deficiency severity, soil pH, and crop type.
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🛑 Over-application may lead to nutrient imbalance or toxicity, especially in low-pH soils.
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✅ For tailored recommendations and safe use, consult an agronomist or local agricultural officer.
