Soil Testing Before Rabi: How to Read Your Soil Health Card

A Soil Health Card (mrida swasthya card) is a printed or digital report of your field's soil test, issued under the Government of India's Soil Health Card scheme. It gives the status of 12 soil parameters and a crop-wise fertilizer recommendation for that field.

According to a PIB factsheet on the Soil Health Card scheme, more than 25 crore cards had been distributed by July 2025 and cards are issued once every three years. Samples are drawn on a grid of 2.5 hectares in irrigated areas and 10 hectares in rainfed areas, and India had 8,272 soil testing labs as of February 2025, including mini labs and village-level labs.

You can view or download your card on the Soil Health Card portal by selecting your state, district and village and entering your name or sample number. The portal is available in many Indian languages, so you can read it in Hindi or your regional language.

Testing before Rabi lets you plan wheat, mustard, chana and potato fertilizer around what your soil actually lacks. The Rabi basal dose is the largest fertilizer purchase of the year for many farmers, so this is where a soil test saves the most money.

The ideal time is right after the Kharif crop is harvested, before you apply any manure or fertilizer for the next crop. Lab turnaround varies by district and can take a few weeks, so collect samples in late September or early October to get results before November sowing.

For dealers and FPOs, soil test data from a village helps you stock the right mix. If most cards in your area show low zinc and sulphur, you know zinc sulphate, SSP and gypsum will move this season.

A soil test is only as good as the sample. A wrong sample (from a manure heap or a bund) gives a wrong card and wrong fertilizer advice.

1. Walk the field in a zig-zag path and mark 8 to 10 spots. Skip bunds, irrigation channels, tree shade and old manure or compost pits.

2. Scrape off surface litter at each spot. Dig a V-shaped pit 15 cm deep (plough depth) with a spade or khurpi.

3. Cut a 2 to 3 cm thick slice from one side of the pit, top to bottom. Collect it in a clean bucket or cloth, not a fertilizer bag.

4. Mix soil from all spots thoroughly. Spread it, divide into four parts, discard two opposite parts, and repeat until about 500 g remains.

5. Dry the sample in shade, not in direct sun. Pack it in a clean cloth or polythene bag.

6. Label it with your name, village, survey or khasra number, previous crop and the crop you plan to grow. Hand it to the KVK, agriculture department lab or soil testing camp.

For orchards or deep-rooted crops, labs may ask for samples from deeper layers as well. Ask your lab before sampling.

Every card has three parts: identification details, test results and recommendations. Read them in that order.

Part 1: Farmer and sample details

Check your name, village, survey number, sample number and the date of sampling. If the survey number or field size is wrong, the recommendation may belong to a different plot. Many cards also show GPS coordinates of the grid.

Part 2: Soil test results

This table lists each of the 12 parameters with a value, a unit and a rating (low, medium, high, or deficient/sufficient). Focus on the rating column first. Low or deficient ratings point to where your money will give the most yield response.

Part 3: Fertilizer recommendations

Most cards give crop-wise doses, often as two fertilizer combinations (for example, one with DAP and urea, another with SSP, urea and MOP). Some also list organic manure, micronutrients, and gypsum or lime where the soil needs correction. Pick the combination that you can buy locally.

pH, EC and organic carbon (OC) describe the soil's condition. They decide how much of the applied fertilizer your crop can actually use.

Low organic carbon is the most common problem on Indian cards. Adding well-decomposed FYM or an enriched vermicompost before sowing improves water holding and nutrient release over time. Organic carbon also stands in for nitrogen supply, so a low OC card usually carries a higher nitrogen recommendation.

Alkaline soils (pH above 8) often show low zinc, iron and phosphorus availability even when the soil holds these nutrients, because they are locked at high pH.

N, P, K and S are the macronutrients on the card, reported as available kg per hectare (S usually in ppm, which equals mg/kg). The bands below are the ones widely used on Indian soil test reports.

Check the unit printed on your card. Some labs report phosphorus as P2O5 and potassium as K2O instead of P and K. To convert, P × 2.29 = P2O5 and K × 1.2 = K2O. If you are unsure which basis your lab used, ask them, because the bands change.

Most Indian soils test low to medium in nitrogen, which is why nitrogen is recommended almost everywhere. Phosphorus is often medium or high in fields that have received DAP for years. If your card shows high P, you can safely reduce DAP for the next crop and save money.

Micronutrients are rated as deficient or sufficient against a critical limit. Below the limit, the crop is likely to respond to that nutrient.

Labs may use slightly different limits, so rely on the rating printed on your own card. A study by ICAR scientists published in Scientific Reports (2021) found that deficiency, including latent (hidden) deficiency, was widespread in Indian soils: about 59% for sulphur, 51% for zinc and 45% for boron.

If your card shows zinc deficient, a basal dose of zinc sulphate fertilizer at the rate on the card is the standard fix for wheat and rice. For boron-deficient soils under mustard, chana or vegetables, a boron fertilizer applied as soil dose or foliar spray as per the card's advice supports flowering and seed set.

The card gives nutrient kg per hectare; you buy products in bags per acre. Use this formula: product needed = nutrient needed ÷ nutrient % in product × 100. Then divide by 2.47 to go from hectare to acre.

Worked example: wheat, 120:60:40 kg NPK per hectare

1. Phosphorus first: 60 kg P2O5 ÷ 46% (DAP) × 100 = about 130 kg DAP per hectare. This DAP also gives about 23 kg N.

2. Nitrogen balance: 120 − 23 = 97 kg N still needed. 97 ÷ 46% (urea) × 100 = about 210 kg urea per hectare.

3. Potash: 40 kg K2O ÷ 60% (MOP) × 100 = about 67 kg MOP per hectare.

4. Convert to acre: divide each by 2.47. You get roughly 53 kg DAP, 85 kg urea and 27 kg MOP per acre.

5. Split the urea as the card or local advice says, usually part at sowing and the rest with the first and second irrigations.

If DAP is short, the same method works with SSP (16% P2O5) or NPK complexes. Just remember to count the N and K they supply before adding urea and MOP.

• Using a card that is more than three years old or belongs to a different plot.

• Reading only the fertilizer table and skipping pH and EC, then wondering why fertilizer did not work.

• Applying the same dose to all fields even though one field tests high in phosphorus.

• Confusing kg of nutrient with kg of product, for example applying 60 kg DAP when the card says 60 kg P2O5.

• Ignoring micronutrient deficiencies until symptoms show up mid-season, when they cost more to fix.

• Not keeping cards year to year, which is the only way to see if organic carbon and nutrient levels are improving.

Download your card, check the plot details and read pH, EC and organic carbon first. Then mark every nutrient rated low or deficient and convert the card's advice into bags per acre before you visit the dealer. If your card is older than three years, collect a fresh sample this month.

Follow the product label and local agriculture officer advice for exact doses. For FPOs and dealers planning bulk stock of micronutrients and organic inputs from soil test data, Katyayani Organics supplies across India.