Soil Testing in Nepal: Government Labs, Procedure & Reading Your Report

Soil testing — mato parikshan in Nepali — is a laboratory analysis of a small, representative sample of your field's soil. The report tells you how acidic or alkaline the soil is (pH), how much organic matter it holds, and how much plant-available nitrogen (N), phosphorus (reported as P2O5) and potassium (reported as K2O) it can supply. From those numbers the laboratory issues a crop-specific fertilizer recommendation and, for acidic soils, an agricultural lime recommendation.

Without a test, most farmers either under-fertilize and lose yield, or over-apply urea while ignoring phosphorus, potassium and soil acidity — a costly mistake, since chemical fertilizer is one of the largest cash inputs in Nepali commercial farming. Laboratory surveys of thousands of farm samples have repeatedly found that a large share of Nepal's cultivated soils are low in organic matter and nitrogen, and that many hill soils are acidic enough to need lime.

Soil testing in Nepal is a public service. The federal Department of Agriculture, the Nepal Agricultural Research Council (NARC), the seven provincial agriculture ministries and a growing number of local governments all run or fund testing services, and government labs analyse farmers' samples free of charge or for a nominal fee — far less than the money saved on a single season's fertilizer bill. Private laboratories in the Kathmandu Valley also test soil for commercial clients.

After federal restructuring in 2075 BS (2018 AD), Nepal's old Soil Management Directorate was merged — together with the Plant Protection Directorate and the Central Seed Testing Laboratory — into the Central Agricultural Laboratory (CAL) at Hariharbhawan, Lalitpur. CAL is the federal reference laboratory: its Soil and Fertilizer Testing section analyses soil and fertilizer samples, issues soil health cards, sets national standards for soil and fertilizer testing laboratories, and trains provincial and local technicians. It is open Sunday through Friday during government office hours (phone 01-5420314).

Research-grade analysis sits with the National Soil Science Research Centre (NSSRC) of the Nepal Agricultural Research Council at Khumaltar, Lalitpur — formerly NARC's Soil Science Division. NSSRC leads national soil-fertility research and, with the International Maize and Wheat Improvement Center (CIMMYT) and USAID's Nepal Seed and Fertilizer project, built Nepal's free digital soil map at soil.narc.gov.np, launched on 24 February 2021 (12 Falgun 2077) using 23,273 geo-referenced soil samples from 56 districts.

Day-to-day farmer service now belongs to the provinces. Each provincial Ministry of Agriculture (MoLMAC) or its Directorate of Agriculture Development runs a Soil and Fertilizer Testing Laboratory, most of them upgraded from the former regional soil-testing labs. The best-documented are listed below; if none is close to you, your District Agriculture Knowledge Centre (AKC) or municipality agriculture section can forward samples or tell you when the next mobile soil-testing camp is scheduled.

Bring or send your sample with a filled-in information slip (farmer's name, address and phone, plot location, crop you plan to grow, previous crop, irrigation status). Several labs, including Gandaki's, now run computerised systems that print the report and recommendation directly.

Because most farmers live far from a laboratory, Nepal also tests soil on wheels. The first dedicated soil-testing mobile van arrived in November 2014, gifted by India through Odisha-based Paradeep Phosphates during Prime Minister Narendra Modi's visit; the vehicle, worth about Rs 7.7 million, was handed to the then Ministry of Agricultural Development and operated by the Soil Management Directorate. Fitted with field kits and instruments, a mobile lab can measure macro-nutrients (nitrogen, phosphorus, potassium) and several micro-nutrients at the farmer's doorstep and give an on-the-spot recommendation.

Today the provincial Soil and Fertilizer Testing Laboratories carry this service forward as mobile soil-testing camps (ghumti mato parikshan shivir). Lab technicians travel to a rural municipality on announced dates, test dozens to hundreds of samples with rapid field methods, hand farmers their results, and bring back sub-samples for laboratory confirmation. The Gandaki lab in Pokhara and the Lumbini lab in Khajura both advertise regular camps, and Khajura also trains local technicians to run small 'mini-lab' soil test kits at the municipal level.

To bring a camp to your village, apply through your rural municipality or municipality agriculture section or the District Agriculture Knowledge Centre — camps are typically organised where a farmer group, cooperative or local government requests one and gathers enough samples. Camp testing for farmers is normally free, since the provincial programme bears the cost.

The routine package at every government lab covers five core parameters. Soil pH is measured in a 1:2.5 soil-water suspension and tells you whether the soil is acidic (below 6.5), near-neutral (about 6.5–7.5, the ideal band for most crops) or alkaline (above 7.5). Organic matter, estimated by the Walkley-Black method, drives soil structure and nitrogen supply. Total nitrogen is measured by the Kjeldahl method, available phosphorus by the modified Olsen bicarbonate method (reported as kg P2O5 per hectare or ppm), and available potassium by the ammonium-acetate extraction with a flame photometer (reported as kg K2O per hectare or ppm). Many labs also report soil texture, and better-equipped ones add micronutrients such as boron and zinc, which are widely deficient in Nepali soils.

Each value on the report card is graded on a scale — typically very low, low, medium, high and very high — using rating ranges adopted by NARC and the Department of Agriculture. The grade, not the raw number, is what the recommendation is built on: a 'low' phosphorus soil gets a higher P2O5 dose than the standard crop recommendation, while a 'high' potassium soil may need little or no muriate of potash. For acidic soils the lab calculates a lime requirement in tonnes per hectare; provincial labs such as Gandaki's run subsidised agricultural-lime distribution programmes alongside testing (farmers there deposit a 25 percent share of the lime cost).

If you cannot reach a lab at all, the NSSRC digital soil map offers a free first look: enter any location on Nepal's arable land and it shows predicted pH, organic matter, nitrogen, phosphorus, potassium, sand-silt-clay and boron and zinc values, generated by machine learning from the national sample database. It is a prediction, not a substitute for testing your own field, but it is a genuinely useful screening tool.

A soil test is only as good as the sample, and sampling is something you do yourself in about half an hour with a spade (khurpi or kodalo), a clean bucket and a plastic bag. The goal is one composite sample that fairly represents one uniform parcel — sample separately for parcels that differ in slope, colour, drainage, crop history or management. The best time is after harvest and before the next planting or fertilizer application, when the field is neither waterlogged nor bone dry.

Follow the standard procedure used by Nepal's soil laboratories and extension offices:

A Nepali soil report or soil health card ends with a recommendation in kilograms of nutrients per hectare — for example 100:30:30, meaning 100 kg N, 30 kg P2O5 and 30 kg K2O per hectare for your stated crop. Fertilizer bags, however, contain nutrients at fixed concentrations: urea is 46 percent N, DAP (di-ammonium phosphate) is 18 percent N plus 46 percent P2O5, and MOP (muriate of potash) is 60 percent K2O. Converting nutrients to bags is simple arithmetic, done in a fixed order because DAP supplies nitrogen too.

First satisfy phosphorus with DAP: 30 kg P2O5 ÷ 0.46 = about 65 kg DAP per hectare. That DAP also delivers 65 × 0.18 ≈ 12 kg N, so subtract it from the nitrogen target: 100 − 12 = 88 kg N still needed, and 88 ÷ 0.46 ≈ 192 kg urea. Potassium is direct: 30 kg K2O ÷ 0.60 = 50 kg MOP. For a field measured in local units, divide the per-hectare figures by 19.66 for ropani (about 9.8 kg urea, 3.3 kg DAP and 2.5 kg MOP per ropani in this example) or by 29.5 for kattha. Nitrogen is normally split — roughly half as a basal dose at planting and the rest top-dressed in one or two later applications — while all DAP and MOP go in at planting.

You do not have to do this arithmetic by hand: amarnepal.com's free fertilizer calculator at /tools/fertilizer-calculator takes a crop and area in ropani, kattha, bigha or hectares and returns the urea, DAP and MOP quantities, including the DAP-nitrogen adjustment. Enter your lab's recommended N:P2O5:K2O figures for the most accurate result; where the lab has also prescribed lime, apply it two to four weeks before planting and repeat testing after two or three seasons to track the change.

Nepal has been rolling out soil health cards (mato swasthya card) — a farmer-held record showing the field's test values, grades, suitable crops and fertilizer and lime recommendations. The then agriculture minister announced the national scheme to Parliament's agriculture committee in March 2019, modelled partly on India's programme, with the longer-term idea of linking cards to subsidised agricultural credit. Implementation now runs through the Central Agricultural Laboratory and the provincial labs, several of which list soil health card issuance among their regular services; coverage is still expanding rather than universal, so ask your lab or AKC whether cards are being issued in your district.

Fees are deliberately low. Routine soil analysis for farmers at government laboratories and mobile camps is free or close to free — the provincial programmes budget for it as an extension service — while charges apply mainly to commercial clients, fertilizer companies and researchers, and private labs charge full commercial rates. Because fee schedules are set office by office and change with annual programmes, phone the laboratory (numbers above) before travelling, and carry citizenship or farmer-group identification for subsidised services.

As a rule of thumb, test each parcel every two to three years, or before switching to a new high-value crop such as vegetables, coffee or kiwi. Keep old reports: comparing pH and organic matter across years is the cheapest way to see whether your manuring, liming and cropping pattern is building your soil or mining it.