Triple Superphosphate (TSP): 0-46-0 Phosphorus Application

Nutrient composition and phosphorus availability

TSP provides a concentrated source of pure phosphate without adding nitrogen, allowing farmers precise control over nitrogen-phosphorus balance.

• Nutrient grade: 0-46-0 containing 46 percent available phosphate (P2O5).
• High water solubility: Over 85 to 90 percent of total phosphate is water-soluble, ensuring prompt root absorption.
• Secondary nutrient contribution: Contains approximately 13 to 15 percent calcium, supporting cell wall structure.
• Zero nitrogen content: Ideal for legume crops (pulses, groundnut, soybean) that fix their own atmospheric nitrogen.

Crop agronomic benefits and basal placement

Because phosphorus is relatively immobile in soil, proper application depth and timing directly impact nutrient efficiency.

• Basal application: Apply at sowing or transplanting time directly into the root zone to promote early root development.
• Band placement: Place fertilizer granules 5 cm below and beside the seed row to maximize contact with developing roots.
• Early vegetative stimulation: Accelerates seedling establishment, enhances tillering in cereals, and encourages early flowering.
• Grain and pod filling: Supports energy transfer (ATP synthesis) and starch accumulation, improving final grain test weight.

Soil reaction, testing, and FCO compliance

TSP performs effectively in neutral to slightly acidic soils. In highly alkaline or calcareous soils, water-soluble phosphate can form insoluble calcium phosphate complexes; banding fertilizer granules and integrating organic manure reduces phosphorus fixation. Fertilizer quality and specifications are regulated under the Fertilizer (Control) Order (FCO).

Related on KisanPe

• Crop Nutrition →
• Fertilizer Calculator →
• Soil Health Card →

Common questions

General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.