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DAP vs SSP: Which Is the Better Phosphorus Source?
Feature DAP (Di-Ammonium Phosphate) SSP (Single Super Phosphate)
Nutrient Content 18% Nitrogen (N) + 46% Phosphorus (P₂O₅) 16% Phosphorus (P₂O₅) + 12% Sulphur (S) + 21% Calcium (Ca)
Soil Reaction Slightly alkaline effect Slightly acidic effect
Solubility & Availability Highly soluble and fast P availability Moderate solubility — longer P availability
Other Nutrients Only N and P Provides P + S + Ca (secondary nutrients)
Best suited soils Neutral to slightly acidic soils Alkaline or marginal soils (low fertility, low organic matter)
⚖️ Performance Comparison

Yield Response

In fertile soils with good structure and irrigation DAP gives quick and higher initial growth because of its nitrogen content.

On marginal, calcareous, alkaline soils (pH more than7.5) → SSP often performs better because:

Sulphur improves nutrient uptake and oil quality (for oilseed crops).

Calcium improves soil structure and root health.

Acidic nature enhances phosphorus availability.

Phosphorus Use Efficiency (PUE)

In high pH soils, DAP’s phosphorus gets fixed as calcium phosphate (less available).

SSP releases phosphorus more slowly and keeps it available longer.

Crop Suitability

DAP: Wheat, rice, maize — where nitrogen and rapid start are desired.

SSP: Sugarcane, pulses, oilseeds (canola, sesame, groundnut) — which respond strongly to sulphur.

🌱 Field Tip for Best Yield

👉 Combination strategy:
Apply 50% P from DAP + 50% from SSP.
This balances quick availability (DAP) with sustained release and sulphur supply (SSP).

👉 On marginal soils:
SSP alone or in major portion (60–70%) is often better than DAP, especially for oilseeds and legumes.
It improves soil health and long-term productivity.

✅ Summary
Condition Recommended Phosphorus Source
Fertile, well-irrigated soils DAP
Marginal, calcareous, or alkaline soils SSP
Oilseed or pulse crops SSP
Cereal crops on fertile land DAP
For balanced approach Mix of DAP + SSP
DAP (Di-Ammonium Phosphate) is indeed the most popular and economical phosphorus source in Pakistan for most field crops. Here’s a concise explanation of why it’s considered best and cheaper overall:

💪 Why DAP Is the Best Option

High Nutrient Content

Contains 46% P₂O₅ (phosphorus) and 18% nitrogen (N) — both essential for early root and tiller growth.

You get two major nutrients in one bag, saving handling and application cost.

Economical Per Unit of Phosphorus

Even though one bag of DAP is costlier than SSP, DAP provides more phosphorus per kg, so the cost per unit of P is lower.

For example:

1 bag DAP = 46% P₂O₅

1 bag SSP = 16% P₂O₅
→ You’d need nearly 3 bags of SSP to match the phosphorus in 1 bag of DAP.

Quick Crop Response

DAP provides readily available phosphorus for seedling root development.

The nitrogen (NH₄⁺ form) promotes strong early growth and tillering, especially in cereals like wheat, rice, and maize.

Ease of Use

One product for both P and N — simplifies fertilizer planning and uniform distribution in the field.

⚠️ When to Be Careful

In high pH or calcareous soils, phosphorus from DAP may get fixed — so avoid overuse.

In oilseeds and pulses, SSP may still give a slight edge due to sulphur content.

✅ Practical Summary
Crop Type Best Phosphorus Source Remarks
Wheat, Rice, Maize DAP Fast growth, economical
Sugarcane, Pulses, Oilseeds SSP or mix Better sulphur nutrition
Marginal/alkaline soils SSP Improves soil health
General-purpose fertilizer DAP Best cost–benefit ratio
DAP — The Most Economical Phosphorus Source

Why Farmers Prefer DAP Over SSP

DAP: Dual Benefit of Nitrogen and Phosphorus

SSP – Suitable for Marginal and Alkaline Soils

When SSP Can Perform Better Than DAP

Balanced Use of DAP and SSP for Maximum Yield

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