In the Spotlight

Indonesia spends approximately IDR 32 trillion per year on agricultural fertiliser subsidies — one of the largest line items in the national agricultural budget. Yet fertiliser use efficiency among Indonesian smallholder farmers is among the lowest in the region. Studies by the Indonesian Center for Agricultural Technology Assessment and Development (BPTP) consistently show that 40–60% of applied nitrogen fertiliser is lost to leaching, volatilisation, or runoff, never reaching the crops it was intended to feed.

The root cause of this inefficiency is not carelessness or a lack of effort on the part of farmers. It is the absence of basic soil information. Most smallholder farmers in Indonesia have never had their soil tested. They apply fertiliser based on habit, neighbour advice, or retailer recommendations — all of which are disconnected from the actual nutrient status of their specific plots.

Why Soil Testing Has Been Inaccessible

Laboratory-based soil analysis — the traditional method for measuring macro and micronutrient levels, pH, organic matter content, and cation exchange capacity — requires samples to be shipped to a certified testing facility, processed over several days, and interpreted by a qualified soil scientist. In Indonesia, where the nearest BPTP facility may be several hours' travel from a remote farming community, this process is both time-consuming and prohibitively expensive for farmers operating on thin margins.

The cost of a full soil analysis panel at a commercial laboratory typically ranges from IDR 300,000 to IDR 800,000 per sample — a significant expense for a farmer whose entire net income from a growing season might be IDR 5–8 million per hectare. The result is that soil testing remains a practice associated with large commercial plantations and research institutions, entirely disconnected from the smallholder majority who cultivate most of Indonesia's agricultural land.

DayaTani's Portable Testing Approach

DayaTani's soil testing solution is built around portable, field-deployable testing kits that provide rapid analysis of the most agronomically significant soil parameters — pH, nitrogen, phosphorus, potassium, and organic matter — within 20 minutes, in the field, without laboratory infrastructure.

The kits are operated by trained DayaTani field technicians who collect soil samples from multiple points within a plot, prepare them according to standardised protocols, and run the analysis using colorimetric and electrochemical test methods. Results are captured via a mobile application that automatically uploads them to the farmer's profile in the DayaTani platform.

The soil data then feeds into the AI-driven fertiliser recommendation engine, which calculates customised input plans based on measured soil nutrient levels, the target crop, expected yield goal, and the available fertiliser products in the local market. Recommendations are delivered in a format farmers can act on: specific product names, quantities per application, timing relative to growth stages, and splitting schedules that align with rainfall patterns.

What the Numbers Show

In a structured trial conducted across 240 participating farmers in Lombok and West Java during the 2024 dry season, farmers following DayaTani's soil-based fertiliser recommendations achieved average fertiliser cost reductions of 23% compared to their previous season's practice — without any measurable yield penalty. In 31% of cases, yields actually increased by 8–14%, attributed to correction of previously undetected micronutrient deficiencies, particularly zinc and boron, which are widespread in heavily leached tropical soils but absent from standard subsidy fertiliser formulations.

The environmental implications are equally significant. Reducing over-application of nitrogen fertiliser decreases nitrous oxide emissions from agricultural soils — a greenhouse gas with 298 times the warming potential of CO2 over a 100-year horizon. The same trials estimated a reduction of approximately 180 kg CO2-equivalent per hectare per season from corrected nitrogen management alone.

Scaling the Model

The commercial model for soil testing services operates on a fee-per-plot basis, priced at a level designed to be affordable for smallholders while covering field technician costs and platform infrastructure. For farmers enrolled in DayaTani's integrated farm management programme, soil testing is bundled into the service package alongside advisory access, farm record-keeping, and market linkage.

The longer-term vision is to build a national soil health database — a georeferenced map of soil nutrient status, pH distribution, and organic matter levels across Indonesia's agricultural zones. This dataset would have transformative value for national agricultural policy, input subsidy targeting, and the development of locally calibrated crop models that reflect the actual conditions Indonesian farmers face, not idealised parameters derived from temperate-climate research.

For now, the immediate priority is simpler: making sure that every farmer who wants to know what their soil actually needs has an affordable, accessible way to find out.