An estimated 80 percent of Philippine soil is deteriorated, according to the Department of Agriculture (DA). That figure means the vast majority of farmland across the country can no longer absorb nutrients effectively, which directly translates to lower crop yields and higher costs for farmers who keep applying more fertilizer to compensate. The problem is not new, but its scale — and the speed at which it has worsened — has pushed soil health to the top of the national agricultural agenda.
The situation is not unique to the Philippines — the Food and Agriculture Organization (FAO) reports that roughly 33 percent of soils globally are degraded — but the local figure is significantly higher than the global average. DA Undersecretary Roger Navarro has pointed to the overuse of inorganic fertilizers as the primary driver, explaining that once soil structure breaks down, it can no longer hold nutrients, leading to a cycle of waste and environmental damage. The broader context of urbanization challenges in Metro Manila shares a similar pattern of resource strain, though the mechanisms differ.
What Soil Degradation Actually Means for Farming
Soil degradation is not simply about poor harvests. When the ground loses its ability to hold nutrients, the consequences ripple outward. Navarro explained that deteriorated soil cannot absorb inorganic fertilizer, so the chemicals either evaporate into the atmosphere — adding to greenhouse gas emissions — or get washed into waterways, contaminating water systems and harming aquatic life. This is why the DA has been pushing for a shift toward organic fertilizers, though the transition comes with its own set of practical hurdles.
The Hidden Threat of Toxic Elements in Farm Soil
Beyond nutrient depletion, a separate but related concern involves the accumulation of potentially toxic elements (PTEs) in the soil. A recent study published in Environmental Geochemistry and Health assessed soil contamination in an island province with a history of mining disasters and found that median concentrations of several metals — including cadmium at 0.750 mg/kg, chromium at 64.0 mg/kg, and copper at 407.5 mg/kg — exceeded international safety limits by factors ranging from 1 to 480. Lead and nickel also surpassed safe thresholds, with nickel exceeding limits by a factor of 135.
The study examined three exposure pathways — incidental ingestion, dermal contact, and inhalation — and found that all target hazard quotients for children at every site, and for adults at two sites, exceeded the threshold of 1, indicating potential non-cancer risks. Monte Carlo simulations identified chromium as the element with the greatest impact on health risks. These findings are particularly relevant for provinces where mining has historically overlapped with agricultural land, as the same soil that grows food may also carry long-term health hazards. The broader issue of mining’s toxic grip on Philippine pollution provides additional context for understanding how industrial activity compounds soil contamination.
What Gets Overlooked in the Push for Organic Fertilizers
The DA has been promoting organic fertilizers as the primary remedy for soil degradation, and the logic is straightforward: organic matter rebuilds soil structure, improves water retention, and feeds beneficial microorganisms. But the transition is not as simple as swapping one bag for another. DA Undersecretary Navarro acknowledged that organic fertilizers are bulkier, which drives up transportation and application costs — a significant barrier in rural and mountainous regions where logistics are already challenging.
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| Factor | Inorganic Fertilizer | Organic Fertilizer |
|---|---|---|
| Nutrient concentration | High, fast-acting | Low, slow-release |
| Transport cost | Low (compact) | High (bulky) |
| Soil structure impact | Degrades over time | Rebuilds over time |
| Risk of pests/pathogens | Low | Moderate if improperly processed |
| Environmental runoff | High | Low |
The Pest and Pathogen Problem
If not properly composted or processed, organic fertilizers can carry pests, pathogens, or weed seeds. This poses a real risk to crop health, especially for smallholder farmers who may not have the equipment or knowledge to ensure proper treatment. The tradeoff is clear: organic fertilizers improve long-term soil health but require more labor, more land for composting, and more careful handling.
The National Organic Agriculture Program (NOAP)
The DA has implemented the National Organic Agriculture Program (NOAP) to address these challenges. NOAP provides education, financial support, and certifications such as the Participatory Guarantee System (PGS), which offers a cost-effective alternative to traditional organic certification. The program also supports composting facilities for biodegradable waste, aiming to reduce dependence on chemical fertilizers. However, scaling these initiatives to reach the 80 percent of farms on degraded soil remains a massive logistical undertaking.
Emerging Solutions: The National Soil Health Volunteer Program
In December 2025, the DA-Bureau of Soils and Water Management (DA-BSWM) launched the National Soil Health Volunteer Program (NSHVP) as an expansion of the existing National Soil Health Program. Led by Director Dr. Gina Parde-Nilo, the program aims to localize sustainable soil management practices, including balanced fertilization projects for rice and other crops, soil improvement in coconut areas, and the deployment of mobile soil labs. This volunteer-based approach could help bridge the gap between national policy and on-the-ground implementation, particularly in remote farming communities. The program was introduced during the 3rd Philippine Soil Partnership (PSP) Plenary Assembly, which also saw the inauguration of a climate-smart greenhouse facility featuring hydroponics, aeroponics, and aquaponics systems — part of what the DA calls its “White Revolution” initiative for modernizing vegetable production.
Practical Steps for Farmers and Land Managers
For farmers and agricultural stakeholders looking to address soil degradation, the path forward involves a combination of assessment, gradual transition, and community-based support. The following actions are grounded in the DA’s current programs and the research findings on soil contamination.
Start with a Soil Test
Before applying any fertilizer — organic or inorganic — a soil test is essential. The DA-BSWM, through its regional field offices and mobile soil labs under the NSHVP, offers soil analysis services that measure nutrient levels, pH, and the presence of potentially toxic elements. Knowing what is actually in the soil prevents both over-application and under-application of nutrients. Farmers can request testing through their local DA office or through participating state universities and colleges.
Transition Gradually to Organic Fertilizers
A complete switch from inorganic to organic fertilizers overnight is rarely practical. A phased approach — replacing 25 to 30 percent of chemical fertilizer with compost or organic alternatives per planting season — allows the soil to rebuild its structure without a sudden drop in yield. The DA’s composting facility program provides technical support for setting up small-scale composting operations on farms or in barangays.
Join a Participatory Guarantee System (PGS) Group
For farmers interested in organic certification, the PGS offers a group-based, peer-reviewed alternative to third-party certification. It is significantly cheaper and more accessible for smallholders. Farmers organize into local groups, inspect each other’s practices, and collectively certify their produce as organic. The NOAP provides training and documentation support for PGS groups.
Monitor for Toxic Elements in High-Risk Areas
In provinces with a history of mining or industrial activity, soil testing should include screening for cadmium, chromium, copper, lead, and nickel. The study on PTE contamination found that chromium had the greatest impact on health risks, particularly for children. If elevated levels are detected, farmers may need to shift to crops that accumulate fewer heavy metals or implement phytoremediation strategies using plants that absorb contaminants. The DA-BSWM’s research and development projects under the PSP’s Action Area 5 — Assessment, Monitoring, and Mapping of Soil Health — are working to standardize these testing methods and make data more accessible.
Frequently Asked Questions About Soil Pollution in Philippine Farms
Can deteriorated soil be restored, or is the damage permanent? ▾
Is organic fertilizer always safer than chemical fertilizer? ▾
How do I know if my farm has toxic element contamination? ▾
What crops are safest to grow on contaminated soil? ▾
Does the National Soil Health Volunteer Program cover all provinces? ▾
What to Watch For Next
The DA’s push for soil restoration through the NSHVP, the climate-smart greenhouse facility, and the expanded National Organic Agriculture Program represents a coordinated response to a problem that has been decades in the making. But the scale of the challenge — 80 percent of soil already deteriorated, plus the added risk of toxic element contamination in mining-adjacent areas — means that progress will depend on how effectively national programs reach individual farms. For farmers, the single most important step is getting a soil test before making any fertilizer decisions. Without knowing what is in the ground, no amount of input — organic or otherwise — will solve the underlying problem. If this was useful, you might also want to read how waste management solutions are addressing the Philippines’ environmental crisis.
Sources
Mining’s toxic grip on Philippine pollution — Explains how mining operations contribute to heavy metal contamination in soil and water systems across the archipelago.
Pollution trends in the archipelago’s rivers — Covers how agricultural runoff and industrial discharge affect river systems, complementing the soil contamination picture.
80% of soil in PH deteriorated. Manila Bulletin, 2024.
Soil contamination by potentially toxic elements in a Philippine island province. Environmental Geochemistry and Health, 2025.
DA-BSWM at the forefront of soil health and climate-smart agriculture. DA-Bureau of Soils and Water Management, 2025.
