Pahang’s durian belt sits in the hills around Raub and Bentong, on slopes, at elevation, in soil that drains fast. Durian is unforgiving about roots, and slope makes the root zone harder to manage, not easier.
The Raub and Bentong durian areas are largely upland granitic and sedimentary soils on slopes, often shallower over weathered parent rock, with good natural drainage but limited capacity to hold water and nutrients. Elevation moderates temperature, which is part of why the area produces well.
Durian roots are shallow and highly sensitive to both waterlogging and compaction. On slope, the risk profile shifts: less standing water, but more runoff loss of applied nutrient and topsoil, and a thinner effective root zone to work with. Organic matter is doing structural work here as much as chemical work.
Pahang’s inland highland areas receive rain distributed relatively evenly through the year, with inter-monsoon peaks around April–May and October–November. Flowering is triggered by dry spells, so rainfall timing has direct commercial consequences for fruit set.
