The research arrives at a critical moment. Indonesia remains heavily dependent on sugar imports despite decades of domestic production programs. East Java plays a central role in this equation, contributing the largest share of national sugarcane output. Yet production data over the past three decades show repeated instability, exposing farmers, mills, and policymakers to mounting economic risks as climate uncertainty intensifies.
Why Sugarcane Stability Matters Now
Sugar is not only a household staple but also a strategic commodity with direct implications for food inflation, rural livelihoods, and trade balances. When domestic supply weakens, import volumes rise sharply, putting pressure on foreign exchange reserves and domestic prices.
East Java’s sugarcane sector supports millions of livelihoods, from smallholder farmers to industrial processing workers. Any sustained decline in productivity therefore carries consequences far beyond agriculture, affecting purchasing power, employment, and regional economic resilience.
Against this backdrop, understanding which factors truly drive production volatility becomes essential—not only for farmers, but for national economic planning.
A Long-Term Look at Climate and Production
The study examines 28 years of data (1995–2023), combining agricultural statistics from Indonesia’s Central Statistics Agency with climate records from the national meteorological authority. Instead of focusing on short-term fluctuations, the researchers tracked how production responds to climate and structural pressures over time.
To do this, they used a dynamic economic modeling approach that allows short-term shocks and long-term trends to be analyzed simultaneously. In simple terms, the model observes how sugarcane production reacts when rainfall, temperature, land area, or population change—and how quickly the sector recovers afterward.
This long horizon offers a clearer picture of structural vulnerability rather than seasonal noise.
Rainfall, Not Temperature, Drives Long-Term Risk
One of the most striking findings is that rainfall—not temperature—is the dominant climate risk for sugarcane production in East Java.
In the long run:
- A 1% increase in annual rainfall reduces sugarcane output by about 0.46%
- The negative effect persists over time, indicating structural inefficiency rather than temporary disruption
Excessive rainfall increases waterlogging, lowers sugar concentration, and complicates harvesting logistics. These effects translate directly into higher production costs and lower market returns.
By contrast, temperature variables—minimum, average, and maximum—show no statistically significant long-term impact. This challenges the common narrative that rising heat is the primary climate threat to tropical crops. In East Java’s case, water management emerges as the real bottleneck.
As the authors from Universitas Negeri Surabaya emphasize, hydrological stress consistently disrupts technical efficiency across the production system, outweighing thermal effects in tropical environments.
Land Expansion Reaches Its Economic Limits
Land area remains the only non-climate factor with a positive and significant impact on production. However, the effect is inelastic.
The data show that:
- A 1% increase in harvested land raises output by only 0.58%
- This confirms diminishing marginal returns at the regional scale
In practical terms, expanding sugarcane plantations no longer delivers proportional gains. New land often comes with lower soil quality, higher management costs, and greater environmental trade-offs.
This finding weakens the long-standing policy reliance on extensification as a path toward sugar self-sufficiency. In land-constrained and densely populated regions like East Java, expansion is becoming economically inefficient.
Fast Recovery, Persistent Exposure
Despite repeated climate shocks, the study finds that the sugarcane sector demonstrates strong short-term recovery capacity. Around 85% of production imbalances caused by shocks are corrected within a year.
This suggests that market mechanisms—such as price adjustments and production responses—remain functional. However, rapid recovery does not eliminate long-term exposure. Instead, it masks deeper structural fragility by pushing risk downward to farmers.
Granger causality analysis confirms this asymmetry. Climate variables consistently drive production changes, but production has no feedback effect on climate factors. Farmers absorb climate risk without having the power to offset losses through market influence.
Implications for Policy and Industry
The study sends a clear signal to policymakers and industry leaders:
- Land-based growth strategies are nearing saturation
- Climate adaptation must move to the center of sugar policy
Investment priorities should shift toward:
- Drainage and water-control infrastructure
- Climate-resilient cultivation techniques
- Early-warning systems for extreme rainfall
- Risk-sharing mechanisms such as weather-index insurance
As paraphrased from the authors at Universitas Negeri Surabaya, sustainable sugar production now depends less on expanding physical inputs and more on improving efficiency under climate uncertainty.
For businesses, the findings underline the importance of supply chain resilience. For government, they highlight the need to redesign food security strategies that account for hydrological risk—not just acreage targets.
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