DAP Shortage? 5 Practical DAP Alternatives (SSP, NPK 12:32:16, Nano DAP) Compared

Why does DAP run short during Rabi sowing?

DAP runs short because demand peaks in a narrow window (October to mid-December) and India imports a large share of either finished DAP or its raw materials. When global prices rise or shipping is delayed, stock reaches districts later than farmers need it.

In October 2024, for example, the Department of Fertilizers said DAP availability was affected by geo-political factors, including vessels taking the longer route around the Cape of Good Hope instead of the Red Sea. The same PIB release from the Department of Fertilizers confirmed that the MRP of DAP has been held at ₹1,350 per 50 kg bag.

Because DAP is the cheapest phosphorus per bag at the counter, almost every farmer asks for it first. Wheat, mustard, chana and potato all need phosphorus at sowing, so a two-week delay in DAP supply can push sowing late. Late sowing costs more yield than switching to another phosphorus source.

Punjab alone uses around 5.5 lakh tonnes of DAP in the Rabi season, according to PAU experts quoted in the press. Numbers like these explain why state agriculture departments and universities now advise farmers to use alternatives instead of waiting.

What does one bag of DAP actually supply?

DAP (diammonium phosphate, grade 18:46:0) supplies 18% nitrogen and 46% phosphorus as P2O5. So one 50 kg bag gives 9 kg of nitrogen and 23 kg of P2O5.

This is the number to remember. When you replace DAP, first match the 23 kg of P2O5, then replace the 9 kg of nitrogen. Nine kg of N equals roughly 20 kg of urea (46% N). Farmers who switch to SSP but forget the extra urea often see a paler crop in the first month and blame the new fertilizer.

Most Rabi recommendations are written as nutrients per hectare, not as bags. For example, ICAR-IIWBR recommends 60 kg P2O5 per hectare for irrigated wheat, which is about 24 kg P2O5 per acre, or roughly one bag of DAP per acre. Punjab Agricultural University advises 55 kg DAP per acre for wheat on medium-fertility soils.

DAP vs SSP vs NPK vs TSP vs Nano DAP: nutrient and cost comparison

The fairest way to compare phosphate fertilizers is cost per kg of P2O5, plus the value of any extra nutrients. The table uses MRPs published by IFFCO for 2025 where available. SSP and TSP prices vary by company and state, so calculate them from the MRP printed on the bag.

MRP source: IFFCO issue price and MRP list effective 1 January 2025. Prices can be revised, so confirm the current MRP with your dealer before calculating.

On paper DAP looks cheapest. But NPK 12:32:16 at 1.5 bags per acre also delivers about 11.5 kg of K2O, which is close to 19 kg of MOP. If your soil test shows medium or low potash, that potash has real value and narrows the cost gap.

Alternative 1: Single Super Phosphate (SSP)

SSP is a phosphate fertilizer with 16% P2O5, about 11% sulphur and calcium. It is made in India, which is why it is usually easier to find when imported DAP is delayed.

1. How to substitute SSP for DAP

Use 3 bags (150 kg) of SSP for every 1 bag of DAP, and add about 20 kg of urea at sowing to replace the nitrogen DAP would have given. The 3 bags also supply around 16 kg of sulphur, which is enough to cover the sulphur needs of most Rabi crops on moderately deficient soils.

2. Which crops gain most from SSP

Oilseeds and pulses gain most. ICAR guidance for rapeseed-mustard specifically suggests SSP in place of DAP so that sulphur is supplied along with phosphorus. For chana and matar, which fix their own nitrogen, the missing nitrogen from DAP matters less, so SSP is often the simpler choice.

The trade-off is bulk. Three bags mean more handling, more freight and more storage space for dealers. Granular SSP spreads and drills better than powder SSP.

Alternatives 2 to 4: NPK 12:32:16, NPK 10:26:26 and TSP

NPK complexes supply nitrogen, phosphorus and potash in one granule. They suit farmers who would have applied DAP plus MOP anyway.

Use about 1.5 bags (72 kg) of NPK 12:32:16 to replace one bag of DAP. This gives about 23 kg P2O5, 8.6 kg N and 11.5 kg K2O, so no nitrogen correction is needed at sowing. It works well for wheat, chana and mustard on soils with low to medium potash.

NPK 10:26:26 has more potash. About 1.8 bags (88 kg) give 23 kg P2O5 and 23 kg K2O. Use it for potash-hungry crops such as potato, onion and garlic, or where the Soil Health Card shows low potassium. Add around 10 kg urea to cover the nitrogen gap.

NPK 20:20:0:13 is a third option where sulphur is needed. But replacing a full DAP bag with it gives about 46 kg of nitrogen at sowing, which is too much nitrogen up front for most crops. It is more useful as a part-substitute.

1. Alternative 4: Triple Super Phosphate (TSP)

TSP is a straight phosphate fertilizer with 46% P2O5, the same phosphorus content as DAP but with no nitrogen. One bag of TSP replaces one bag of DAP for phosphorus.

Add about 20 kg of urea per bag of TSP used, to cover the 9 kg of nitrogen. TSP is less widely stocked in India than SSP, so availability depends on the district. It suits dealers who want to keep a compact phosphate stock without the bulk of SSP.

Alternative 5: Nano DAP, and what it can and cannot do

Nano DAP is a liquid fertilizer from IFFCO containing 8% nitrogen and 16% P2O5 (w/v). It is designed for seed treatment, seedling root dips and foliar sprays, not for soil application as a basal dose.

The manufacturer's Nano DAP FAQ gives these doses: seed treatment at 3 to 5 ml per kg of seed, root or tuber dip at 3 to 5 ml per litre of water for 20 to 30 minutes, and a foliar spray at 2 to 4 ml per litre at tillering or branching (30 to 35 days after germination).

Be honest with farmers about quantity. A 500 ml bottle contains about 80 g of P2O5, while a bag of DAP contains 23 kg. Nano DAP can help early root growth and phosphorus uptake, but it cannot fill a soil that is low in phosphorus. Use it alongside a reduced basal dose, not in place of all basal phosphorus, unless your local agriculture officer advises otherwise for your crop.

How to switch from DAP to an alternative: step by step

1.    Check your Soil Health Card for available phosphorus, potash and sulphur. Low P needs the full dose; high P soils can often take a reduced dose.

2.    Write down the P2O5 recommendation for your crop per acre (for irrigated wheat, about 24 kg P2O5 per acre).

3.    Pick the substitute that fits the crop: SSP for mustard, chana and groundnut; NPK 12:32:16 for wheat on low-potash soils; NPK 10:26:26 for potato and onion.

4.    Calculate bags: P2O5 needed ÷ P2O5 per bag. For 24 kg P2O5, that is 3 bags SSP, 1.5 bags 12:32:16 or 1 bag TSP.

5.    Correct nitrogen at sowing: add about 20 kg urea per replaced DAP bag with SSP or TSP, about 10 kg with 10:26:26, none with 12:32:16.

6.    Reduce MOP if you used an NPK complex that already carries potash.

7.    Drill the phosphate fertilizer near the seed row at sowing. Phosphorus moves very little in soil, so broadcasting on the surface later is far less effective.

8.    Treat seed with a phosphate solubilizing biofertilizer and, if you want, Nano DAP as per label, to help early root uptake.

Organic and biological support when phosphate is scarce

Biological and organic sources do not replace a full chemical dose in one season, but they help crops use more of the phosphorus already locked in the soil. Indian soils often hold large reserves of fixed phosphorus that plants cannot take up quickly.

A phosphate solubilizing bacteria (PSB) biofertilizer applied as seed treatment or mixed with farmyard manure releases part of this fixed phosphorus around the roots. It pairs well with any of the chemical alternatives above.

In organic plots or acidic soils, a phosphate-rich organic manure (PROM) or rock phosphate gives a slow, steady phosphorus supply. Rock phosphate works well in acidic soils (pH below about 6.5) and is slow in alkaline soils, so match it to your soil test.

Advice for dealers and retailers during a DAP shortage

Dealers who plan alternatives early lose fewer sales and keep farmers sowing on time. The key is to stock by P2O5 quantity, not by bag count.

•      Convert your usual DAP order into P2O5 tonnes, then plan how much SSP, NPK and TSP you need to cover the same P2O5.

•      Keep urea in step with SSP and TSP sales, since each replaced DAP bag needs about 20 kg extra urea.

•      Print a simple counter chart: 1 DAP = 3 SSP + 20 kg urea = 1.5 NPK 12:32:16 = 1 TSP + 20 kg urea.

•      Stock biofertilizers such as PSB next to phosphate fertilizers so farmers see them as a pair.

•      Do not force tie-in sales. Many states act against dealers who make DAP conditional on buying other products.

For bulk supply of biofertilizers and organic phosphate products, Katyayani Organics supplies distributors and institutional buyers across India.

What to do next

If DAP is not available on the day you want to sow, do not wait. Pick SSP or NPK 12:32:16 based on your crop and soil test, correct the nitrogen with urea, and drill the fertilizer at sowing. The yield lost to a late-sown crop is usually larger than any difference between these phosphate sources.

Follow the product label and local agriculture officer advice for exact doses in your district, and keep your Soil Health Card handy when you visit the dealer.