From Guesswork to Data: Inside Five Days of Soil Health Training in Del Carmen, Siargao

Eighty farmers' worth of soil knowledge in five days: how AGREA's Del Carmen training with DA-BSWM taught sampling, testing, and fertilizer recommendations.

The test tube

The Bureau of Soils and Water Management describes its Soil Test Kit in disarmingly plain terms. It is a rapid test that analyses soil pH, nitrogen, phosphorus, and potassium. It uses colour charts and pictures to establish whether soil is acidic or alkaline, and whether those three nutrients are low, medium, or high.

That is the whole instrument. A test tube, a set of reagents, a colour chart, and a farmer who has been taught to read them.

From 22 to 26 June 2026, AGREA Foundation convened a five-day training at the Women's Center in Del Carmen, Surigao del Norte under the Para sa Isla Project, titled Capacity Building on Soil Health, Soil Testing, Fertilizer Recommendation, and Hands-On Training on Soil Test Kits. The technical sessions were facilitated by specialists from the DA–Bureau of Soils and Water Management, in partnership with the Municipal Agriculture and Fisheries Office.

The premise of the week was narrow and practical: a farmer who does not know the condition of her soil is guessing, and guessing costs money in both directions — too little fertilizer and the yield falls, too much and the money is wasted while the excess runs off.

What a farmer in Santander, Cebu said about it

The most useful description of why this training matters does not come from Del Carmen. It comes from a DA-Region VII soil testing exercise in Santander, Cebu earlier in 2026, where farmers brought their own soil samples to be analysed.

Melchora Miraz, one of the farmers who used the service, said the benefit was substantial — because they had not known how much fertilizer they should be applying, and as a result sometimes applied too much and sometimes too little. With soil testing, she said, they could save on cost and be more assured of a good harvest.

Her fellow farmers, after trying the STK themselves in a hands-on demonstration, put it more memorably. They had become chemists now, they said.

That is the shift the Del Carmen training was designed to produce: from a farmer who buys fertilizer on habit or on a neighbour's advice, to a farmer who applies it on the basis of a reading taken from her own field.

The five days, in sequence

The training moved through four connected steps, and each depends on the one before it.

1. Sampling — the step that determines whether the result means anything

Soil analysis begins in the field, not the test tube. If the sample does not represent the plot, the recommendation that follows will be wrong — and confidently wrong, which is worse than no recommendation at all.

The DA's standard procedure, as set out in training materials prepared with JICA, is specific. Clear the surface area, removing stones and grasses without scraping off the topsoil. Dig a V-cut hole to a depth of about 20 centimetres. From one vertical side of the pit, take a slice of soil two to three centimetres thick with a single downward thrust of the shovel, then trim it with a knife or trowel to a bar about five centimetres wide, and place it in a clean container.

That is one sub-sample. It must be repeated across the plot, because a single hole describes a single spot. Only after all sub-samples are collected are they pulverised, mixed thoroughly to homogenise them, and cleared of stones and fresh leaves. The volume is then reduced to one kilogram by quartering.

The sample is air-dried by spreading it on plastic sheets or mats under shade or indoors, kept away from contamination, dirt, and foreign matter. Once dry, at least one kilogram goes into a clean plastic bag, labelled with the farmer's name, address, coordinates where applicable, and the crop to be planted — with rice indicating hybrid or inbred, corn indicating OPV or hybrid, and fruit trees indicating the age of the crop.

Those labelling details are not bureaucratic fussiness. A fertilizer recommendation depends on the crop, and for rice and corn it depends on the variety type, because a hybrid and an inbred of the same species do not feed identically. A sample without that information produces a recommendation that may be numerically precise and agronomically wrong.

2. Testing — what the STK can and cannot tell you

The STK is the affordable end of soil analysis. Laboratory chemical analysis, the JICA-supported module notes, takes a long time and requires costly chemicals, technical manpower, and instruments. The STK is a less costly and rapid procedure that yields a qualitative interpretation of the relative amounts of plant nutrients — low, medium, or high rather than a precise figure.

The standard kit used in the Philippines was developed by the University of the Philippines Los Baños and is produced and distributed by BSWM's Rapid Soil Testing Section, which also monitors how kits are used by beneficiaries and provides fertilizer recommendations for various crops.

The ATI's Filipino-language guide for farmers is candid about the kit's scope and its limits. Its advantages: it is easy to carry, effective, and economical; the analysis can be done on the farm itself; it establishes soil fertility and immediately informs the farmer whether the land has enough nitrogen, phosphorus, or potassium; it establishes soil pH; and with proper use, technicians and farmers can determine what fertilizer the intended crop requires.

Its caution is equally clear: when using the STK, make sure to consult field or soils laboratory technicians, because the soil may have other problems that require additional guidance from a BSWM representative.

That is an important boundary. The STK tests four things. Soil can fail in many more ways than four — compaction, salinity, poor drainage, micronutrient deficiency, low organic matter — and a low, medium, or high reading on N, P, and K does not rule those out.

3. Interpretation and recommendation — the digital step

The fourth of BSWM's four steps is where the numbers become an instruction.

The agency's Fertilizer Recommendation application — distributed as BSWM FertRight — was launched in May 2024 and generates crop- and site-specific fertilizer recommendations in under a minute. The user enters a sample identifier, sampling location, and sampling date, specifies the crop, and inputs the soil analysis results. The application returns a recommended rate indicating the right kind, right amount, and right timing of fertilizer application — what the bureau calls the 3Rs — and the report can be exported as a PDF.

It is Android-only, and it also carries a Filipino-language guide to proper soil sample collection and preparation. By September 2024, BSWM had integrated a Cropping Pattern and Calendar tool for rice cropping into the application as well.

This is the piece that closes the loop. An STK reading of "medium phosphorus" is not a decision. A recommendation specifying a quantity, a formulation, and a timing is.

4. Application — and the strategy behind it

The recommendation lands inside a broader department strategy that the brief refers to as evidence-based soil management.

The Adaptive Balanced Fertilization Strategy, run under the National Soil Health Program, is described by DA as a science-based farming method focused on cost-efficient and proper combinations of organic and inorganic fertilizers to sustain productivity gains. Its stated purpose is to address soil fertility and plant nutrition not only to maximise yield but to produce and maintain healthy soils and reduce production costs.

That framing matters because it is not an argument for replacing inorganic fertilizer with organic inputs, or the reverse. It is an argument for matching the combination to what the soil actually lacks — which is precisely what a soil test establishes.

Where Del Carmen sits in a national programme

The training was not an isolated local initiative. It connects to a national architecture.

The National Soil Health Program has been led by DA-BSWM since 2020, with the aim of a systematic and holistic approach to soil health for sustainable use and management of soil resources and enhanced productivity and income. It was formally launched by President Ferdinand R. Marcos Jr. and DA Secretary Francisco P. Tiu Laurel Jr. in December 2024, and in December 2025 it was expanded through the National Soil Health Volunteer Program, which BSWM Director Gina Parde-Nilo described as helping localise sustainable soil management practices — including balanced fertilization, soil improvement in coconut areas, land management strategies, small composting setups, and mobile soil labs.

The scale of that rollout is concrete. On 30 June 2025, 16 ten-wheeler mobile soil laboratory units were turned over to the regions, each equipped to analyse 44 parameters covering soil chemical, physical, microbiological, and water quality characteristics. By October 2025, one unit in Central Luzon — a ₱35.9 million facility — was scheduled for a seven-week deployment to Zambales to conduct soil health monitoring, site-specific fertilizer recommendations, capacity-building for farmers and extension workers, and updating of the provincial soil fertility map.

BSWM anchors the programme on what it calls the "3 A's": Accessible, Available, and Accurate soil health solutions for farmers.

A five-day training in a municipal Women's Center is the smallest unit of that ambition. It is also the unit that determines whether the ambition reaches anyone.

Why the timing was not incidental

The week of 22–26 June 2026 fell inside a forecast that had already turned serious.

PAGASA raised the ENSO level to El Niño Alert on 22 April 2026. Its models projected the phenomenon reaching very strong intensity during October to December 2026, and by November widespread below-normal rainfall indicated the highest likelihood for the development of meteorological drought. The outlook for November 2026 to April 2027 described below-normal to way-below-normal rainfall across most of the country — below-normal meaning 20 to 60 percent less rain than usual, way-below-normal meaning more than 60 percent less. PAGASA has forecast drought conditions in 12 areas from November 2026 to April 2027.

For agriculture, the impacts listed in the DA's own El Niño Alert include severe water scarcity affecting staple crops, reduced soil moisture, and a rise in pest and disease infestations. PAGASA has advised farmers to conserve water, maintain irrigation facilities, consider drought-tolerant crops, and implement practices that help retain soil moisture.

This is where soil health stops being a long-term agronomic concern and becomes an immediate one. FAO Philippines has made the connection explicitly, emphasising that drought impacts extend beyond rainfall deficits to include soil condition and groundwater availability, and urging comprehensive soil health assessments to safeguard food security.

The reasoning is straightforward. How much of a rainfall event a field retains depends on the condition of that field — its structure, its organic matter, its depth, whether it is compacted or capped. A soil that has been mined of organic matter and worked wet sheds water and loses topsoil. A soil in good condition holds moisture through a dry spell and gives a crop a few more days of grace.

A soil test does not make a drought go away. It tells a farmer what she is working with before the drought arrives, which is the only moment at which anything can be done about it.

What the training does and does not establish

A five-day training is an input, and it should be described as one.

It does not establish that any participant has since submitted a sample, received a recommendation, or changed a fertilizer application. It does not establish that soil health cards were issued, that test kits were distributed to participants, or that a single field's input costs fell. None of those outcomes was reported in the announcement, and none should be assumed.

It also does not establish that the STK is sufficient on its own. BSWM's own guidance directs users to consult technicians precisely because the kit's four parameters cannot detect every problem a soil may have — and in a municipality whose land ranges from coastal flats to upland slopes, the range of possible problems is wide.

What the training does establish is that a group of local farmers and MAFO personnel spent five days with the national bureau responsible for soil and water management, working through the full sequence from sampling to recommendation with their own hands. That is the transfer of a capability, not the delivery of a service. The distinction matters: a service ends when the team leaves, and a capability does not.

What comes next

For the participants, the next steps are specific and unglamorous. Sample before the next planting rather than after the next failure. Follow the depth and the sub-sample count, because a shallow sample from one corner will produce a confident wrong answer. Label the bag with the crop and variety type. Keep the recommendation with the sample record so that the result can be compared against what the field actually did. And consult the MAFO or BSWM when the reading does not match what the crop is showing.

For the Municipal Agriculture and Fisheries Office, the next step is the one that determines whether the week has a lasting effect: whether the office can maintain the practice — keeping soil health cards, retaining recommendations, and supporting farmers who want to resample after a season.

For AGREA, the next step is to keep the sequence connected. Soil testing in June, a recommendation in July, and a planting decision in the next season are three different moments, and each can break from the others. The value of a five-day intensive is that it can hold them together.

A note of appreciation

To the specialists from the DA–Bureau of Soils and Water Management who gave the week, and to the Municipal Agriculture and Fisheries Office for hosting the practice where it belongs — in the municipality. To the farmers who spent five days learning to read their own soil rather than accept a general recommendation.

A colour chart and a test tube are modest instruments. What they replace is guesswork, and guesswork is expensive.

To learn more about the Para sa Isla Project and AGREA Foundation's work on soil health, regenerative agriculture, and climate-resilient livelihoods in Siargao, explore our official channels. Local government units and organisations interested in soil health programming or the Green LGUs initiative can reach out through our contact page.